🕷️ Crawler Inspector

URL Lookup

Direct Parameter Lookup

Raw Queries and Responses

1. Shard Calculation

Query:

Response:

Calculated Shard: 53 (from laksa113)

2. Crawled Status Check

Query:

curl -X POST \
  'http://laksa053.int.ahrefs:8124/' \
  -H 'Content-Type: text/plain' \
  -H 'X-ClickHouse-Database: crawler3' \
  -H 'Authorization: Basic YXBpOg==' \
  -d 'SELECT getAhrefsURLFromUnparsed(src_unparsed) AS found_url, ifNull(toUnixTimestamp(download_stamp), 0) AS crawl_time, ifNull(toUnixTimestamp(props_url_first_seen), 0) AS first_indexed_time, download_http_code AS http_code, src_unparsed AS src_unparsed, src_root_hash AS src_root_hash, history_drop_reason AS history_drop_reason, meta_title AS meta_title, meta_descriptions AS meta_descriptions, attrs_boilerpipe_text AS attrs_boilerpipe_text, attrs_markdown AS attrs_markdown, attrs_readable_markdown AS attrs_readable_markdown, meta_canonical AS meta_canonical FROM crawler3.page_info_local FINAL PREWHERE (src_root_hash, src_unparsed) IN ((getAhrefsRootHashFromUnparsed(getAhrefsUnparsedNoserviceFromURL(\'https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status\')), getAhrefsUnparsedNoserviceFromURL(\'https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status\'))) FORMAT JSONEachRow'

Response:

{"found_url":"https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status","crawl_time":1776209188,"first_indexed_time":1741915619,"http_code":200,"src_unparsed":"org,mozilla!developer,\/en-US\/docs\/Web\/HTTP\/Reference\/Status s443","src_root_hash":"7082249407640205653","history_drop_reason":null,"meta_title":"HTTP response status codes - HTTP | MDN","meta_descriptions":["HTTP response status codes indicate whether a specific HTTP request has been successfully completed. Responses are grouped in five classes:"],"attrs_boilerpipe_text":"Informational responses\n100 Continue\nThis interim response indicates that the client should continue the request or ignore the response if the request is already finished.\n101 Switching Protocols\nThis code is sent in response to an\nUpgrade\nrequest header from the client and indicates the protocol the server is switching to.\n102 Processing\nDeprecated\nThis code was used in\nWebDAV\ncontexts to indicate that a request has been received by the server, but no status was available at the time of the response.\n103 Early Hints\nThis status code is primarily intended to be used with the\nLink\nheader, letting the user agent start\npreloading\nresources while the server prepares a response or\npreconnect\nto an origin from which the page will need resources.\nSuccessful responses\n200 OK\nThe request succeeded. The result and meaning of \"success\" depends on the HTTP method:\nGET\n: The resource has been fetched and transmitted in the message body.\nHEAD\n: Representation headers are included in the response without any message body.\nPUT\nor\nPOST\n: The resource describing the result of the action is transmitted in the message body.\nTRACE\n: The message body contains the request as received by the server.\n201 Created\nThe request succeeded, and a new resource was created as a result. This is typically the response sent after\nPOST\nrequests, or some\nPUT\nrequests.\n202 Accepted\nThe request has been received but not yet acted upon.\nIt is noncommittal, since there is no way in HTTP to later send an asynchronous response indicating the outcome of the request.\nIt is intended for cases where another process or server handles the request, or for batch processing.\nThis response code means the returned metadata is not exactly the same as is available from the origin server, but is collected from a local or a third-party copy.\nThis is mostly used for mirrors or backups of another resource.\nExcept for that specific case, the\n200 OK\nresponse is preferred to this status.\n204 No Content\nThere is no content to send for this request, but the headers are useful.\nThe user agent may update its cached headers for this resource with the new ones.\n205 Reset Content\nTells the user agent to reset the document which sent this request.\n206 Partial Content\nThis response code is used in response to a\nrange request\nwhen the client has requested a part or parts of a resource.\n207 Multi-Status\n(\nWebDAV\n)\nConveys information about multiple resources, for situations where multiple status codes might be appropriate.\n208 Already Reported\n(\nWebDAV\n)\nUsed inside a\n<dav:propstat>\nresponse element to avoid repeatedly enumerating the internal members of multiple bindings to the same collection.\n226 IM Used\n(\nHTTP Delta encoding\n)\nThe server has fulfilled a\nGET\nrequest for the resource, and the response is a representation of the result of one or more instance-manipulations applied to the current instance.\nRedirection messages\n300 Multiple Choices\nIn\nagent-driven content negotiation\n, the request has more than one possible response and the user agent or user should choose one of them.\nThere is no standardized way for clients to automatically choose one of the responses, so this is rarely used.\n301 Moved Permanently\nThe URL of the requested resource has been changed permanently. The new URL is given in the response.\n302 Found\nThis response code means that the URI of requested resource has been changed\ntemporarily\n.\nFurther changes in the URI might be made in the future, so the same URI should be used by the client in future requests.\n303 See Other\nThe server sent this response to direct the client to get the requested resource at another URI with a\nGET\nrequest.\n304 Not Modified\nThis is used for caching purposes.\nIt tells the client that the response has not been modified, so the client can continue to use the same\ncached\nversion of the response.\n305 Use Proxy\nDeprecated\nDefined in a previous version of the HTTP specification to indicate that a requested response must be accessed by a proxy.\nIt has been deprecated due to security concerns regarding in-band configuration of a proxy.\n306 unused\nThis response code is no longer used; but is reserved. It was used in a previous version of the HTTP\/1.1 specification.\n307 Temporary Redirect\nThe server sends this response to direct the client to get the requested resource at another URI with the same method that was used in the prior request.\nThis has the same semantics as the\n302 Found\nresponse code, with the exception that the user agent\nmust not\nchange the HTTP method used: if a\nPOST\nwas used in the first request, a\nPOST\nmust be used in the redirected request.\n308 Permanent Redirect\nThis means that the resource is now permanently located at another URI, specified by the\nLocation\nresponse header.\nThis has the same semantics as the\n301 Moved Permanently\nHTTP response code, with the exception that the user agent\nmust not\nchange the HTTP method used: if a\nPOST\nwas used in the first request, a\nPOST\nmust be used in the second request.\nClient error responses\n400 Bad Request\nThe server cannot or will not process the request due to something that is perceived to be a client error (e.g., malformed request syntax, invalid request message framing, or deceptive request routing).\n401 Unauthorized\nAlthough the HTTP standard specifies \"unauthorized\", semantically this response means \"unauthenticated\".\nThat is, the client must authenticate itself to get the requested response.\n402 Payment Required\nThe initial purpose of this code was for digital payment systems, however this status code is rarely used and no standard convention exists.\n403 Forbidden\nThe client does not have access rights to the content; that is, it is unauthorized, so the server is refusing to give the requested resource.\nUnlike\n401 Unauthorized\n, the client's identity is known to the server.\n404 Not Found\nThe server cannot find the requested resource.\nIn the browser, this means the URL is not recognized.\nIn an API, this can also mean that the endpoint is valid but the resource itself does not exist.\nServers may also send this response instead of\n403 Forbidden\nto hide the existence of a resource from an unauthorized client.\nThis response code is probably the most well known due to its frequent occurrence on the web.\n405 Method Not Allowed\nThe\nrequest method\nis known by the server but is not supported by the target resource.\nFor example, an API may not allow\nDELETE\non a resource, or the\nTRACE\nmethod entirely.\n406 Not Acceptable\nThis response is sent when the web server, after performing\nserver-driven content negotiation\n, doesn't find any content that conforms to the criteria given by the user agent.\n407 Proxy Authentication Required\nThis is similar to\n401 Unauthorized\nbut authentication is needed to be done by a proxy.\n408 Request Timeout\nThis response is sent on an idle connection by some servers, even without any previous request by the client.\nIt means that the server would like to shut down this unused connection.\nThis response is used much more since some browsers use HTTP pre-connection mechanisms to speed up browsing.\nSome servers may shut down a connection without sending this message.\n409 Conflict\nThis response is sent when a request conflicts with the current state of the server.\nIn\nWebDAV\nremote web authoring,\n409\nresponses are errors sent to the client so that a user might be able to resolve a conflict and resubmit the request.\n410 Gone\nThis response is sent when the requested content has been permanently deleted from server, with no forwarding address.\nClients are expected to remove their caches and links to the resource.\nThe HTTP specification intends this status code to be used for \"limited-time, promotional services\".\nAPIs should not feel compelled to indicate resources that have been deleted with this status code.\n411 Length Required\nServer rejected the request because the\nContent-Length\nheader field is not defined and the server requires it.\n412 Precondition Failed\nIn\nconditional requests\n, the client has indicated preconditions in its headers which the server does not meet.\n413 Content Too Large\nThe request body is larger than limits defined by server.\nThe server might close the connection or return a\nRetry-After\nheader field.\n414 URI Too Long\nThe URI requested by the client is longer than the server is willing to interpret.\n415 Unsupported Media Type\nThe media format of the requested data is not supported by the server, so the server is rejecting the request.\n416 Range Not Satisfiable\nThe\nranges\nspecified by the\nRange\nheader field in the request cannot be fulfilled.\nIt's possible that the range is outside the size of the target resource's data.\n417 Expectation Failed\nThis response code means the expectation indicated by the\nExpect\nrequest header field cannot be met by the server.\n418 I'm a teapot\nThe server refuses the attempt to brew coffee with a teapot.\n421 Misdirected Request\nThe request was directed at a server that is not able to produce a response.\nThis can be sent by a server that is not configured to produce responses for the combination of scheme and authority that are included in the request URI.\n422 Unprocessable Content\n(\nWebDAV\n)\nThe request was well-formed but was unable to be followed due to semantic errors.\n423 Locked\n(\nWebDAV\n)\nThe resource that is being accessed is locked.\n424 Failed Dependency\n(\nWebDAV\n)\nThe request failed due to failure of a previous request.\n425 Too Early\nExperimental\nIndicates that the server is unwilling to risk processing a request that might be replayed.\n426 Upgrade Required\nThe server refuses to perform the request using the current protocol but might be willing to do so after the client upgrades to a different protocol.\nThe server sends an\nUpgrade\nheader in a 426 response to indicate the required protocol(s).\n428 Precondition Required\nThe origin server requires the request to be\nconditional\n.\nThis response is intended to prevent the 'lost update' problem, where a client\nGET\ns a resource's state, modifies it and\nPUT\ns it back to the server, when meanwhile a third party has modified the state on the server, leading to a conflict.\n429 Too Many Requests\nThe user has sent too many requests in a given amount of time (\nrate limiting\n).\n431 Request Header Fields Too Large\nThe server is unwilling to process the request because its header fields are too large.\nThe request may be resubmitted after reducing the size of the request header fields.\n451 Unavailable For Legal Reasons\nThe user agent requested a resource that cannot legally be provided, such as a web page censored by a government.\nServer error responses\n500 Internal Server Error\nThe server has encountered a situation it does not know how to handle.\nThis error is generic, indicating that the server cannot find a more appropriate\n5XX\nstatus code to respond with.\n501 Not Implemented\nThe request method is not supported by the server and cannot be handled. The only methods that servers are required to support (and therefore must not return this code) are\nGET\nand\nHEAD\n.\n502 Bad Gateway\nThis error response means that the server, while working as a gateway to get a response needed to handle the request, got an invalid response.\n503 Service Unavailable\nThe server is not ready to handle the request.\nCommon causes are a server that is down for maintenance or that is overloaded.\nNote that together with this response, a user-friendly page explaining the problem should be sent.\nThis response should be used for temporary conditions and the\nRetry-After\nHTTP header should, if possible, contain the estimated time before the recovery of the service.\nThe webmaster must also take care about the caching-related headers that are sent along with this response, as these temporary condition responses should usually not be cached.\n504 Gateway Timeout\nThis error response is given when the server is acting as a gateway and cannot get a response in time.\n505 HTTP Version Not Supported\nThe HTTP version used in the request is not supported by the server.\n506 Variant Also Negotiates\nThe server has an internal configuration error: during content negotiation, the chosen variant is configured to engage in content negotiation itself, which results in circular references when creating responses.\n507 Insufficient Storage\n(\nWebDAV\n)\nThe method could not be performed on the resource because the server is unable to store the representation needed to successfully complete the request.\n508 Loop Detected\n(\nWebDAV\n)\nThe server detected an infinite loop while processing the request.\n510 Not Extended\nThe client request declares an HTTP Extension (\nRFC 2774\n) that should be used to process the request, but the extension is not supported.\n511 Network Authentication Required\nIndicates that the client needs to authenticate to gain network access.\nBrowser compatibility\nSee also\nList of HTTP status codes on Wikipedia\nIANA official registry of HTTP status codes","attrs_markdown":"- [Skip to main content](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status#content)\n- [Skip to search](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status#search)\n\nHTML\n\n[HTML: Markup language](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTML)\n\nHTML reference\n\n- [Elements](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTML\/Reference\/Elements)\n- [Global attributes](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTML\/Reference\/Global_attributes)\n- [Attributes](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTML\/Reference\/Attributes)\n- [See all…](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTML\/Reference \"See all HTML references\")\n\nHTML guides\n\n- [Responsive images](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTML\/Guides\/Responsive_images)\n- [HTML cheatsheet](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTML\/Guides\/Cheatsheet)\n- [Date & time formats](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTML\/Guides\/Date_and_time_formats)\n- [See all…](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTML\/Guides \"See all HTML guides\")\n\nMarkup languages\n\n- [SVG](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/SVG)\n- [MathML](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/MathML)\n- [XML](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/XML)\n\nCSS\n\n[CSS: Styling language](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/CSS)\n\nCSS reference\n\n- [Properties](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/CSS\/Reference\/Properties)\n- [Selectors](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/CSS\/Reference\/Selectors)\n- [At-rules](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/CSS\/Reference\/At-rules)\n- [Values](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/CSS\/Reference\/Values)\n- [See all…](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/CSS\/Reference \"See all CSS references\")\n\nCSS guides\n\n- [Box model](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/CSS\/Guides\/Box_model\/Introduction)\n- [Animations](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/CSS\/Guides\/Animations\/Using)\n- [Flexbox](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/CSS\/Guides\/Flexible_box_layout\/Basic_concepts)\n- [Colors](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/CSS\/Guides\/Colors\/Applying_color)\n- [See all…](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/CSS\/Guides \"See all CSS guides\")\n\nLayout cookbook\n\n- [Column layouts](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/CSS\/How_to\/Layout_cookbook\/Column_layouts)\n- [Centering an element](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/CSS\/How_to\/Layout_cookbook\/Center_an_element)\n- [Card component](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/CSS\/How_to\/Layout_cookbook\/Card)\n- [See all…](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/CSS\/How_to\/Layout_cookbook)\n\nJavaScriptJS\n\n[JavaScript: Scripting language](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/JavaScript)\n\nJS reference\n\n- [Standard built-in objects](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/JavaScript\/Reference\/Global_Objects)\n- [Expressions & operators](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/JavaScript\/Reference\/Operators)\n- [Statements & declarations](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/JavaScript\/Reference\/Statements)\n- [Functions](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/JavaScript\/Reference\/Functions)\n- [See all…](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/JavaScript\/Reference \"See all JavaScript references\")\n\nJS guides\n\n- [Control flow & error handing](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/JavaScript\/Guide\/Control_flow_and_error_handling)\n- [Loops and iteration](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/JavaScript\/Guide\/Loops_and_iteration)\n- [Working with objects](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/JavaScript\/Guide\/Working_with_objects)\n- [Using classes](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/JavaScript\/Guide\/Using_classes)\n- [See all…](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/JavaScript\/Guide \"See all JavaScript guides\")\n\nWeb APIs\n\n[Web APIs: Programming interfaces](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/API)\n\nWeb API reference\n\n- [File system API](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/API\/File_System_API)\n- [Fetch API](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/API\/Fetch_API)\n- [Geolocation API](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/API\/Geolocation_API)\n- [HTML DOM API](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/API\/HTML_DOM_API)\n- [Push API](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/API\/Push_API)\n- [Service worker API](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/API\/Service_Worker_API)\n- [See all…](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/API \"See all Web API guides\")\n\nWeb API guides\n\n- [Using the Web animation API](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/API\/Web_Animations_API\/Using_the_Web_Animations_API)\n- [Using the Fetch API](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/API\/Fetch_API\/Using_Fetch)\n- [Working with the History API](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/API\/History_API\/Working_with_the_History_API)\n- [Using the Web speech API](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/API\/Web_Speech_API\/Using_the_Web_Speech_API)\n- [Using web workers](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/API\/Web_Workers_API\/Using_web_workers)\n\nAll\n\n[All web technology](https:\/\/developer.mozilla.org\/en-US\/docs\/Web)\n\nTechnologies\n\n- [Accessibility](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/Accessibility)\n- [HTTP](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP)\n- [URI](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/URI)\n- [Web extensions](https:\/\/developer.mozilla.org\/en-US\/docs\/Mozilla\/Add-ons\/WebExtensions)\n- [WebAssembly](https:\/\/developer.mozilla.org\/en-US\/docs\/WebAssembly)\n- [WebDriver](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/WebDriver)\n- [See all…](https:\/\/developer.mozilla.org\/en-US\/docs\/Web \"See all web technology references\")\n\nTopics\n\n- [Media](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/Media)\n- [Performance](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/Performance)\n- [Privacy](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/Privacy)\n- [Security](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/Security)\n- [Progressive web apps](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/Progressive_web_apps)\n\nLearn\n\n[Learn web development](https:\/\/developer.mozilla.org\/en-US\/docs\/Learn_web_development)\n\nFrontend developer course\n\n- [Getting started modules](https:\/\/developer.mozilla.org\/en-US\/docs\/Learn_web_development\/Getting_started)\n- [Core modules](https:\/\/developer.mozilla.org\/en-US\/docs\/Learn_web_development\/Core)\n- [MDN Curriculum](https:\/\/developer.mozilla.org\/en-US\/curriculum\/)\n- [Check out the video course from Scrimba, our partner](https:\/\/scrimba.com\/frontend-path-c0j?via=mdn-learn-navbar)\n\nLearn HTML\n\n- [Structuring content with HTML module](https:\/\/developer.mozilla.org\/en-US\/docs\/Learn_web_development\/Core\/Structuring_content)\n\nLearn CSS\n\n- [CSS styling basics module](https:\/\/developer.mozilla.org\/en-US\/docs\/Learn_web_development\/Core\/Styling_basics)\n- [CSS layout module](https:\/\/developer.mozilla.org\/en-US\/docs\/Learn_web_development\/Core\/CSS_layout)\n\nLearn JavaScript\n\n- [Dynamic scripting with JavaScript module](https:\/\/developer.mozilla.org\/en-US\/docs\/Learn_web_development\/Core\/Scripting)\n\nTools\n\nDiscover our tools\n\n- [Playground](https:\/\/developer.mozilla.org\/en-US\/play)\n- [HTTP Observatory](https:\/\/developer.mozilla.org\/en-US\/observatory)\n\n- [Border-image generator](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/CSS\/Guides\/Backgrounds_and_borders\/Border-image_generator)\n- [Border-radius generator](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/CSS\/Guides\/Backgrounds_and_borders\/Border-radius_generator)\n- [Box-shadow generator](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/CSS\/Guides\/Backgrounds_and_borders\/Box-shadow_generator)\n- [Color format converter](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/CSS\/Guides\/Colors\/Color_format_converter)\n- [Color mixer](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/CSS\/Guides\/Colors\/Color_mixer)\n- [Shape generator](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/CSS\/Guides\/Shapes\/Shape_generator)\n\nAbout\n\nGet to know MDN better\n\n- [About MDN](https:\/\/developer.mozilla.org\/en-US\/about)\n- [Advertise with us](https:\/\/developer.mozilla.org\/en-US\/advertising)\n\n- [Community](https:\/\/developer.mozilla.org\/en-US\/community)\n- [MDN on GitHub](https:\/\/github.com\/mdn)\n\n[Blog](https:\/\/developer.mozilla.org\/en-US\/blog\/)\n\n1. [Web](https:\/\/developer.mozilla.org\/en-US\/docs\/Web)\n2. [HTTP](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP)\n3. [Reference](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference)\n4. [HTTP response status codes](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status)\n\n# HTTP response status codes\nHTTP response status codes indicate whether a specific [HTTP](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP) request has been successfully completed. Responses are grouped in five classes:\n\n1. [Informational responses](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status#informational_responses) (`100` – `199`)\n2. [Successful responses](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status#successful_responses) (`200` – `299`)\n3. [Redirection messages](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status#redirection_messages) (`300` – `399`)\n4. [Client error responses](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status#client_error_responses) (`400` – `499`)\n5. [Server error responses](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status#server_error_responses) (`500` – `599`)\n\nThe status codes listed below are defined by [RFC 9110](https:\/\/httpwg.org\/specs\/rfc9110.html#overview.of.status.codes).\n\n**Note:** If you receive a response that is not listed here, it is a non-standard response, possibly custom to the server's software.\n\n## In this article\n- [Informational responses](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status#informational_responses)\n- [Successful responses](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status#successful_responses)\n- [Redirection messages](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status#redirection_messages)\n- [Client error responses](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status#client_error_responses)\n- [Server error responses](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status#server_error_responses)\n- [Browser compatibility](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status#browser_compatibility)\n- [See also](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status#see_also)\n\n## [Informational responses](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status#informational_responses)\n[`100 Continue`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/100)\n\nThis interim response indicates that the client should continue the request or ignore the response if the request is already finished.\n\n[`101 Switching Protocols`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/101)\n\nThis code is sent in response to an [`Upgrade`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Upgrade) request header from the client and indicates the protocol the server is switching to.\n\n[`102 Processing`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/102)\n\nDeprecated\n\nThis code was used in [WebDAV](https:\/\/developer.mozilla.org\/en-US\/docs\/Glossary\/WebDAV) contexts to indicate that a request has been received by the server, but no status was available at the time of the response.\n\n[`103 Early Hints`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/103)\n\nThis status code is primarily intended to be used with the [`Link`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Link) header, letting the user agent start [preloading](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTML\/Reference\/Attributes\/rel\/preload) resources while the server prepares a response or [preconnect](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTML\/Reference\/Attributes\/rel\/preconnect) to an origin from which the page will need resources.\n\n## [Successful responses](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status#successful_responses)\n[`200 OK`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/200)\n\nThe request succeeded. The result and meaning of \"success\" depends on the HTTP method:\n\n- [`GET`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Methods\/GET): The resource has been fetched and transmitted in the message body.\n- [`HEAD`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Methods\/HEAD): Representation headers are included in the response without any message body.\n- [`PUT`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Methods\/PUT) or [`POST`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Methods\/POST): The resource describing the result of the action is transmitted in the message body.\n- [`TRACE`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Methods\/TRACE): The message body contains the request as received by the server.\n\n[`201 Created`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/201)\n\nThe request succeeded, and a new resource was created as a result. This is typically the response sent after [`POST`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Methods\/POST) requests, or some [`PUT`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Methods\/PUT) requests.\n\n[`202 Accepted`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/202)\n\nThe request has been received but not yet acted upon. It is noncommittal, since there is no way in HTTP to later send an asynchronous response indicating the outcome of the request. It is intended for cases where another process or server handles the request, or for batch processing.\n\n[`203 Non-Authoritative Information`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/203)\n\nThis response code means the returned metadata is not exactly the same as is available from the origin server, but is collected from a local or a third-party copy. This is mostly used for mirrors or backups of another resource. Except for that specific case, the [`200 OK`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/200) response is preferred to this status.\n\n[`204 No Content`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/204)\n\nThere is no content to send for this request, but the headers are useful. The user agent may update its cached headers for this resource with the new ones.\n\n[`205 Reset Content`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/205)\n\nTells the user agent to reset the document which sent this request.\n\n[`206 Partial Content`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/206)\n\nThis response code is used in response to a [range request](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/Range_requests) when the client has requested a part or parts of a resource.\n\n[`207 Multi-Status`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/207) ([WebDAV](https:\/\/developer.mozilla.org\/en-US\/docs\/Glossary\/WebDAV))\n\nConveys information about multiple resources, for situations where multiple status codes might be appropriate.\n\n[`208 Already Reported`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/208) ([WebDAV](https:\/\/developer.mozilla.org\/en-US\/docs\/Glossary\/WebDAV))\n\nUsed inside a `<dav:propstat>` response element to avoid repeatedly enumerating the internal members of multiple bindings to the same collection.\n\n[`226 IM Used`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/226) ([HTTP Delta encoding](https:\/\/datatracker.ietf.org\/doc\/html\/rfc3229))\n\nThe server has fulfilled a [`GET`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Methods\/GET) request for the resource, and the response is a representation of the result of one or more instance-manipulations applied to the current instance.\n\n## [Redirection messages](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status#redirection_messages)\n[`300 Multiple Choices`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/300)\n\nIn [agent-driven content negotiation](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/Content_negotiation#agent-driven_negotiation), the request has more than one possible response and the user agent or user should choose one of them. There is no standardized way for clients to automatically choose one of the responses, so this is rarely used.\n\n[`301 Moved Permanently`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/301)\n\nThe URL of the requested resource has been changed permanently. The new URL is given in the response.\n\n[`302 Found`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/302)\n\nThis response code means that the URI of requested resource has been changed *temporarily*. Further changes in the URI might be made in the future, so the same URI should be used by the client in future requests.\n\n[`303 See Other`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/303)\n\nThe server sent this response to direct the client to get the requested resource at another URI with a [`GET`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Methods\/GET) request.\n\n[`304 Not Modified`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/304)\n\nThis is used for caching purposes. It tells the client that the response has not been modified, so the client can continue to use the same [cached](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/Caching) version of the response.\n\n[`305 Use Proxy` Deprecated](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status#305_use_proxy)\n\nDefined in a previous version of the HTTP specification to indicate that a requested response must be accessed by a proxy. It has been deprecated due to security concerns regarding in-band configuration of a proxy.\n\n[`306 unused`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status#306_unused)\n\nThis response code is no longer used; but is reserved. It was used in a previous version of the HTTP\/1.1 specification.\n\n[`307 Temporary Redirect`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/307)\n\nThe server sends this response to direct the client to get the requested resource at another URI with the same method that was used in the prior request. This has the same semantics as the `302 Found` response code, with the exception that the user agent *must not* change the HTTP method used: if a [`POST`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Methods\/POST) was used in the first request, a `POST` must be used in the redirected request.\n\n[`308 Permanent Redirect`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/308)\n\nThis means that the resource is now permanently located at another URI, specified by the [`Location`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Location) response header. This has the same semantics as the `301 Moved Permanently` HTTP response code, with the exception that the user agent *must not* change the HTTP method used: if a [`POST`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Methods\/POST) was used in the first request, a `POST` must be used in the second request.\n\n## [Client error responses](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status#client_error_responses)\n[`400 Bad Request`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/400)\n\nThe server cannot or will not process the request due to something that is perceived to be a client error (e.g., malformed request syntax, invalid request message framing, or deceptive request routing).\n\n[`401 Unauthorized`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/401)\n\nAlthough the HTTP standard specifies \"unauthorized\", semantically this response means \"unauthenticated\". That is, the client must authenticate itself to get the requested response.\n\n[`402 Payment Required`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/402)\n\nThe initial purpose of this code was for digital payment systems, however this status code is rarely used and no standard convention exists.\n\n[`403 Forbidden`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/403)\n\nThe client does not have access rights to the content; that is, it is unauthorized, so the server is refusing to give the requested resource. Unlike `401 Unauthorized`, the client's identity is known to the server.\n\n[`404 Not Found`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/404)\n\nThe server cannot find the requested resource. In the browser, this means the URL is not recognized. In an API, this can also mean that the endpoint is valid but the resource itself does not exist. Servers may also send this response instead of `403 Forbidden` to hide the existence of a resource from an unauthorized client. This response code is probably the most well known due to its frequent occurrence on the web.\n\n[`405 Method Not Allowed`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/405)\n\nThe [request method](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Methods) is known by the server but is not supported by the target resource. For example, an API may not allow `DELETE` on a resource, or the `TRACE` method entirely.\n\n[`406 Not Acceptable`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/406)\n\nThis response is sent when the web server, after performing [server-driven content negotiation](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/Content_negotiation#server-driven_content_negotiation), doesn't find any content that conforms to the criteria given by the user agent.\n\n[`407 Proxy Authentication Required`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/407)\n\nThis is similar to `401 Unauthorized` but authentication is needed to be done by a proxy.\n\n[`408 Request Timeout`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/408)\n\nThis response is sent on an idle connection by some servers, even without any previous request by the client. It means that the server would like to shut down this unused connection. This response is used much more since some browsers use HTTP pre-connection mechanisms to speed up browsing. Some servers may shut down a connection without sending this message.\n\n[`409 Conflict`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/409)\n\nThis response is sent when a request conflicts with the current state of the server. In [WebDAV](https:\/\/developer.mozilla.org\/en-US\/docs\/Glossary\/WebDAV) remote web authoring, `409` responses are errors sent to the client so that a user might be able to resolve a conflict and resubmit the request.\n\n[`410 Gone`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/410)\n\nThis response is sent when the requested content has been permanently deleted from server, with no forwarding address. Clients are expected to remove their caches and links to the resource. The HTTP specification intends this status code to be used for \"limited-time, promotional services\". APIs should not feel compelled to indicate resources that have been deleted with this status code.\n\n[`411 Length Required`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/411)\n\nServer rejected the request because the [`Content-Length`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Content-Length) header field is not defined and the server requires it.\n\n[`412 Precondition Failed`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/412)\n\nIn [conditional requests](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/Conditional_requests), the client has indicated preconditions in its headers which the server does not meet.\n\n[`413 Content Too Large`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/413)\n\nThe request body is larger than limits defined by server. The server might close the connection or return a [`Retry-After`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Retry-After) header field.\n\n[`414 URI Too Long`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/414)\n\nThe URI requested by the client is longer than the server is willing to interpret.\n\n[`415 Unsupported Media Type`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/415)\n\nThe media format of the requested data is not supported by the server, so the server is rejecting the request.\n\n[`416 Range Not Satisfiable`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/416)\n\nThe [ranges](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/Range_requests) specified by the `Range` header field in the request cannot be fulfilled. It's possible that the range is outside the size of the target resource's data.\n\n[`417 Expectation Failed`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/417)\n\nThis response code means the expectation indicated by the [`Expect`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Expect) request header field cannot be met by the server.\n\n[`418 I'm a teapot`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/418)\n\nThe server refuses the attempt to brew coffee with a teapot.\n\n[`421 Misdirected Request`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/421)\n\nThe request was directed at a server that is not able to produce a response. This can be sent by a server that is not configured to produce responses for the combination of scheme and authority that are included in the request URI.\n\n[`422 Unprocessable Content`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/422) ([WebDAV](https:\/\/developer.mozilla.org\/en-US\/docs\/Glossary\/WebDAV))\n\nThe request was well-formed but was unable to be followed due to semantic errors.\n\n[`423 Locked`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/423) ([WebDAV](https:\/\/developer.mozilla.org\/en-US\/docs\/Glossary\/WebDAV))\n\nThe resource that is being accessed is locked.\n\n[`424 Failed Dependency`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/424) ([WebDAV](https:\/\/developer.mozilla.org\/en-US\/docs\/Glossary\/WebDAV))\n\nThe request failed due to failure of a previous request.\n\n[`425 Too Early`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/425)\n\nExperimental\n\nIndicates that the server is unwilling to risk processing a request that might be replayed.\n\n[`426 Upgrade Required`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/426)\n\nThe server refuses to perform the request using the current protocol but might be willing to do so after the client upgrades to a different protocol. The server sends an [`Upgrade`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Upgrade) header in a 426 response to indicate the required protocol(s).\n\n[`428 Precondition Required`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/428)\n\nThe origin server requires the request to be [conditional](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/Conditional_requests). This response is intended to prevent the 'lost update' problem, where a client [`GET`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Methods\/GET)s a resource's state, modifies it and [`PUT`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Methods\/PUT)s it back to the server, when meanwhile a third party has modified the state on the server, leading to a conflict.\n\n[`429 Too Many Requests`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/429)\n\nThe user has sent too many requests in a given amount of time ([rate limiting](https:\/\/developer.mozilla.org\/en-US\/docs\/Glossary\/Rate_limit)).\n\n[`431 Request Header Fields Too Large`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/431)\n\nThe server is unwilling to process the request because its header fields are too large. The request may be resubmitted after reducing the size of the request header fields.\n\n[`451 Unavailable For Legal Reasons`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/451)\n\nThe user agent requested a resource that cannot legally be provided, such as a web page censored by a government.\n\n## [Server error responses](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status#server_error_responses)\n[`500 Internal Server Error`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/500)\n\nThe server has encountered a situation it does not know how to handle. This error is generic, indicating that the server cannot find a more appropriate `5XX` status code to respond with.\n\n[`501 Not Implemented`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/501)\n\nThe request method is not supported by the server and cannot be handled. The only methods that servers are required to support (and therefore must not return this code) are [`GET`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Methods\/GET) and [`HEAD`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Methods\/HEAD).\n\n[`502 Bad Gateway`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/502)\n\nThis error response means that the server, while working as a gateway to get a response needed to handle the request, got an invalid response.\n\n[`503 Service Unavailable`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/503)\n\nThe server is not ready to handle the request. Common causes are a server that is down for maintenance or that is overloaded. Note that together with this response, a user-friendly page explaining the problem should be sent. This response should be used for temporary conditions and the [`Retry-After`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Retry-After) HTTP header should, if possible, contain the estimated time before the recovery of the service. The webmaster must also take care about the caching-related headers that are sent along with this response, as these temporary condition responses should usually not be cached.\n\n[`504 Gateway Timeout`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/504)\n\nThis error response is given when the server is acting as a gateway and cannot get a response in time.\n\n[`505 HTTP Version Not Supported`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/505)\n\nThe HTTP version used in the request is not supported by the server.\n\n[`506 Variant Also Negotiates`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/506)\n\nThe server has an internal configuration error: during content negotiation, the chosen variant is configured to engage in content negotiation itself, which results in circular references when creating responses.\n\n[`507 Insufficient Storage`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/507) ([WebDAV](https:\/\/developer.mozilla.org\/en-US\/docs\/Glossary\/WebDAV))\n\nThe method could not be performed on the resource because the server is unable to store the representation needed to successfully complete the request.\n\n[`508 Loop Detected`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/508) ([WebDAV](https:\/\/developer.mozilla.org\/en-US\/docs\/Glossary\/WebDAV))\n\nThe server detected an infinite loop while processing the request.\n\n[`510 Not Extended`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/510)\n\nThe client request declares an HTTP Extension ([RFC 2774](https:\/\/datatracker.ietf.org\/doc\/html\/rfc2774)) that should be used to process the request, but the extension is not supported.\n\n[`511 Network Authentication Required`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/511)\n\nIndicates that the client needs to authenticate to gain network access.\n## [Browser compatibility](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status#browser_compatibility)\n## [See also](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status#see_also)\n- [List of HTTP status codes on Wikipedia](https:\/\/en.wikipedia.org\/wiki\/List_of_HTTP_status_codes)\n- [IANA official registry of HTTP status codes](https:\/\/www.iana.org\/assignments\/http-status-codes\/http-status-codes.xhtml)\n\n## Help improve MDN\n[Learn how to contribute](https:\/\/developer.mozilla.org\/en-US\/docs\/MDN\/Community\/Getting_started)\n\nThis page was last modified on Jan 5, 2026 by [MDN contributors](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/contributors.txt).\n\n[View this page on GitHub](https:\/\/github.com\/mdn\/content\/blob\/main\/files\/en-us\/web\/http\/reference\/status\/index.md?plain=1 \"Folder: en-us\/web\/http\/reference\/status (Opens in a new tab)\") • [Report a problem with this content](https:\/\/github.com\/mdn\/content\/issues\/new?template=page-report.yml&mdn-url=https%3A%2F%2Fdeveloper.mozilla.org%2Fen-US%2Fdocs%2FWeb%2FHTTP%2FReference%2FStatus&metadata=%3C%21--+Do+not+make+changes+below+this+line+--%3E%0A%3Cdetails%3E%0A%3Csummary%3EPage+report+details%3C%2Fsummary%3E%0A%0A*+Folder%3A+%60en-us%2Fweb%2Fhttp%2Freference%2Fstatus%60%0A*+MDN+URL%3A+https%3A%2F%2Fdeveloper.mozilla.org%2Fen-US%2Fdocs%2FWeb%2FHTTP%2FReference%2FStatus%0A*+GitHub+URL%3A+https%3A%2F%2Fgithub.com%2Fmdn%2Fcontent%2Fblob%2Fmain%2Ffiles%2Fen-us%2Fweb%2Fhttp%2Freference%2Fstatus%2Findex.md%0A*+Last+commit%3A+https%3A%2F%2Fgithub.com%2Fmdn%2Fcontent%2Fcommit%2Fcd8ed9bfa89d5ced4fd6c2083d7d90bcda41e441%0A*+Document+last+modified%3A+2026-01-05T21%3A08%3A23.000Z%0A%0A%3C%2Fdetails%3E \"This will take you to GitHub to file a new issue.\")\n\n1. [HTTP](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP)\n2. [Guides](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides)\n3. [Overview of HTTP](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/Overview)\n4. [Evolution of HTTP](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/Evolution_of_HTTP)\n5. [A typical HTTP session](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/Session)\n6. [HTTP messages](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/Messages)\n7. [Media types](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/MIME_types)\n   1. [Common types](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/MIME_types\/Common_types)\n8. [Compression in HTTP](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/Compression)\n9. [HTTP caching](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/Caching)\n10. [HTTP authentication](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/Authentication)\n11. [Using HTTP cookies](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/Cookies)\n12. [Redirections in HTTP](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/Redirections)\n13. [Conditional requests](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/Conditional_requests)\n14. [Range requests](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/Range_requests)\n15. [Client hints](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/Client_hints)\n16. [User-Agent reduction](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/User-agent_reduction)\n17. [Compression Dictionary Transport](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/Compression_dictionary_transport)\n    Experimental\n18. [Network Error Logging](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/Network_Error_Logging)\n    Experimental\n19. [Content negotiation](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/Content_negotiation)\n    1. [Default Accept values](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/Content_negotiation\/List_of_default_Accept_values)\n20. [Browser detection using the UA string](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/Browser_detection_using_the_user_agent)\n21. [Connection management in HTTP\/1.x](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/Connection_management_in_HTTP_1.x)\n22. [Protocol upgrade mechanism](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/Protocol_upgrade_mechanism)\n23. [Proxy servers and tunneling](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/Proxy_servers_and_tunneling)\n    1. [Proxy Auto-Configuration (PAC) file](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/Proxy_servers_and_tunneling\/Proxy_Auto-Configuration_PAC_file)\n24. Security and privacy\n    \n    1. [HTTP Observatory](https:\/\/developer.mozilla.org\/en-US\/observatory)\n    2. [Practical implementation guides](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/Security\/Practical_implementation_guides)\n    3. [Permissions Policy](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/Permissions_Policy)\n       Experimental\n    4. [Cross-Origin Resource Policy (CORP)](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/Cross-Origin_Resource_Policy)\n    5. [IFrame credentialless](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/IFrame_credentialless)\n       Experimental\n    6. [Fetch metadata](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/Fetch_metadata)\n    7. [Cross-Origin Resource Sharing (CORS)](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/CORS)\n    8. [CORS errors](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/CORS\/Errors)\n       \n       1. [`Reason: CORS disabled`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/CORS\/Errors\/CORSDisabled)\n       2. [`Reason: CORS header 'Access-Control-Allow-Origin' does not match 'xyz'`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/CORS\/Errors\/CORSAllowOriginNotMatchingOrigin)\n       3. [`Reason: CORS header 'Access-Control-Allow-Origin' missing`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/CORS\/Errors\/CORSMissingAllowOrigin)\n       4. [`Reason: CORS header 'Origin' cannot be added`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/CORS\/Errors\/CORSOriginHeaderNotAdded)\n       5. [`Reason: CORS preflight channel did not succeed`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/CORS\/Errors\/CORSPreflightDidNotSucceed)\n       6. [`Reason: CORS request did not succeed`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/CORS\/Errors\/CORSDidNotSucceed)\n       7. [`Reason: CORS request external redirect not allowed`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/CORS\/Errors\/CORSExternalRedirectNotAllowed)\n       8. [`Reason: CORS request not HTTP`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/CORS\/Errors\/CORSRequestNotHttp)\n       9. [`Reason: Credential is not supported if the CORS header 'Access-Control-Allow-Origin' is '*'`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/CORS\/Errors\/CORSNotSupportingCredentials)\n       10. [`Reason: Did not find method in CORS header 'Access-Control-Allow-Methods'`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/CORS\/Errors\/CORSMethodNotFound)\n       11. [`Reason: expected 'true' in CORS header 'Access-Control-Allow-Credentials'`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/CORS\/Errors\/CORSMIssingAllowCredentials)\n       12. [`Reason: invalid token 'xyz' in CORS header 'Access-Control-Allow-Headers'`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/CORS\/Errors\/CORSInvalidAllowHeader)\n       13. [`Reason: invalid token 'xyz' in CORS header 'Access-Control-Allow-Methods'`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/CORS\/Errors\/CORSInvalidAllowMethod)\n       14. [`Reason: missing token 'xyz' in CORS header 'Access-Control-Allow-Headers' from CORS preflight channel`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/CORS\/Errors\/CORSMissingAllowHeaderFromPreflight)\n       15. [`Reason: Multiple CORS header 'Access-Control-Allow-Origin' not allowed`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/CORS\/Errors\/CORSMultipleAllowOriginNotAllowed)\n    9. [Content Security Policy (CSP)](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/CSP)\n       \n       1. [Errors and warnings](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/CSP\/Errors)\n25. [Reference](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference)\n26. [HTTP headers](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers)\n    \n    1. [`Accept`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Accept)\n    2. [`Accept-CH`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Accept-CH)\n    3. [`Accept-Encoding`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Accept-Encoding)\n    4. [`Accept-Language`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Accept-Language)\n    5. [`Accept-Patch`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Accept-Patch)\n    6. [`Accept-Post`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Accept-Post)\n    7. [`Accept-Ranges`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Accept-Ranges)\n    8. [`Access-Control-Allow-Credentials`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Access-Control-Allow-Credentials)\n    9. [`Access-Control-Allow-Headers`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Access-Control-Allow-Headers)\n    10. [`Access-Control-Allow-Methods`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Access-Control-Allow-Methods)\n    11. [`Access-Control-Allow-Origin`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Access-Control-Allow-Origin)\n    12. [`Access-Control-Expose-Headers`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Access-Control-Expose-Headers)\n    13. [`Access-Control-Max-Age`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Access-Control-Max-Age)\n    14. [`Access-Control-Request-Headers`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Access-Control-Request-Headers)\n    15. [`Access-Control-Request-Method`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Access-Control-Request-Method)\n    16. [`Activate-Storage-Access`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Activate-Storage-Access)\n    17. [`Age`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Age)\n    18. [`Allow`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Allow)\n    19. [`Alt-Svc`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Alt-Svc)\n    20. [`Alt-Used`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Alt-Used)\n    21. [`Attribution-Reporting-Eligible`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Attribution-Reporting-Eligible)\n        Deprecated\n    22. [`Attribution-Reporting-Register-Source`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Attribution-Reporting-Register-Source)\n        Deprecated\n    23. [`Attribution-Reporting-Register-Trigger`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Attribution-Reporting-Register-Trigger)\n        Deprecated\n    24. [`Authorization`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Authorization)\n    25. [`Available-Dictionary`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Available-Dictionary)\n        Experimental\n    26. [`Cache-Control`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Cache-Control)\n    27. [`Clear-Site-Data`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Clear-Site-Data)\n    28. [`Connection`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Connection)\n    29. [`Content-Digest`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Content-Digest)\n    30. [`Content-Disposition`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Content-Disposition)\n    31. [`Content-DPR`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Content-DPR)\n        Non-standard\n        Deprecated\n    32. [`Content-Encoding`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Content-Encoding)\n    33. [`Content-Language`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Content-Language)\n    34. [`Content-Length`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Content-Length)\n    35. [`Content-Location`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Content-Location)\n    36. [`Content-Range`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Content-Range)\n    37. [`Content-Security-Policy`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Content-Security-Policy)\n    38. [`Content-Security-Policy-Report-Only`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Content-Security-Policy-Report-Only)\n    39. [`Content-Type`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Content-Type)\n    40. [`Cookie`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Cookie)\n    41. [`Critical-CH`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Critical-CH)\n        Experimental\n    42. [`Cross-Origin-Embedder-Policy`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Cross-Origin-Embedder-Policy)\n    43. [`Cross-Origin-Embedder-Policy-Report-Only`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Cross-Origin-Embedder-Policy-Report-Only)\n    44. [`Cross-Origin-Opener-Policy`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Cross-Origin-Opener-Policy)\n    45. [`Cross-Origin-Resource-Policy`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Cross-Origin-Resource-Policy)\n    46. [`Date`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Date)\n    47. [`Device-Memory`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Device-Memory)\n        Non-standard\n        Deprecated\n    48. [`Dictionary-ID`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Dictionary-ID)\n        Experimental\n    49. [`DNT`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/DNT)\n        Non-standard\n        Deprecated\n    50. [`Downlink`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Downlink)\n        Experimental\n    51. [`DPR`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/DPR)\n        Non-standard\n        Deprecated\n    52. [`Early-Data`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Early-Data)\n        Experimental\n    53. [`ECT`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/ECT)\n        Experimental\n    54. [`ETag`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/ETag)\n    55. [`Expect`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Expect)\n    56. [`Expect-CT`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Expect-CT)\n        Deprecated\n    57. [`Expires`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Expires)\n    58. [`Forwarded`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Forwarded)\n    59. [`From`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/From)\n    60. [`Host`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Host)\n    61. [`Idempotency-Key`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Idempotency-Key)\n        Experimental\n    62. [`If-Match`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/If-Match)\n    63. [`If-Modified-Since`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/If-Modified-Since)\n    64. [`If-None-Match`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/If-None-Match)\n    65. [`If-Range`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/If-Range)\n    66. [`If-Unmodified-Since`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/If-Unmodified-Since)\n    67. [`Integrity-Policy`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Integrity-Policy)\n    68. [`Integrity-Policy-Report-Only`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Integrity-Policy-Report-Only)\n    69. [`Keep-Alive`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Keep-Alive)\n    70. [`Last-Modified`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Last-Modified)\n    71. [`Link`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Link)\n    72. [`Location`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Location)\n    73. [`Max-Forwards`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Max-Forwards)\n    74. [`NEL`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/NEL)\n        Experimental\n    75. [`No-Vary-Search`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/No-Vary-Search)\n        Experimental\n    76. [`Observe-Browsing-Topics`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Observe-Browsing-Topics)\n        Non-standard\n        Deprecated\n    77. [`Origin`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Origin)\n    78. [`Origin-Agent-Cluster`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Origin-Agent-Cluster)\n    79. [`Permissions-Policy`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Permissions-Policy)\n        Experimental\n    80. [`Pragma`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Pragma)\n        Deprecated\n    81. [`Prefer`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Prefer)\n    82. [`Preference-Applied`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Preference-Applied)\n    83. [`Priority`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Priority)\n    84. [`Proxy-Authenticate`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Proxy-Authenticate)\n    85. [`Proxy-Authorization`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Proxy-Authorization)\n    86. [`Range`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Range)\n    87. [`Referer`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Referer)\n    88. [`Referrer-Policy`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Referrer-Policy)\n    89. [`Refresh`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Refresh)\n    90. [`Report-To`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Report-To)\n        Non-standard\n        Deprecated\n    91. [`Reporting-Endpoints`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Reporting-Endpoints)\n    92. [`Repr-Digest`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Repr-Digest)\n    93. [`Retry-After`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Retry-After)\n    94. [`RTT`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/RTT)\n        Experimental\n    95. [`Save-Data`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Save-Data)\n        Experimental\n    96. [`Sec-Browsing-Topics`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Sec-Browsing-Topics)\n        Non-standard\n        Deprecated\n    97. [`Sec-CH-Device-Memory`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Sec-CH-Device-Memory)\n        Experimental\n    98. [`Sec-CH-DPR`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Sec-CH-DPR)\n        Experimental\n    99. [`Sec-CH-Prefers-Color-Scheme`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Sec-CH-Prefers-Color-Scheme)\n        Experimental\n    100. [`Sec-CH-Prefers-Reduced-Motion`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Sec-CH-Prefers-Reduced-Motion)\n         Experimental\n    101. [`Sec-CH-Prefers-Reduced-Transparency`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Sec-CH-Prefers-Reduced-Transparency)\n         Experimental\n    102. [`Sec-CH-UA`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Sec-CH-UA)\n         Experimental\n    103. [`Sec-CH-UA-Arch`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Sec-CH-UA-Arch)\n         Experimental\n    104. [`Sec-CH-UA-Bitness`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Sec-CH-UA-Bitness)\n         Experimental\n    105. [`Sec-CH-UA-Form-Factors`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Sec-CH-UA-Form-Factors)\n         Experimental\n    106. [`Sec-CH-UA-Full-Version`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Sec-CH-UA-Full-Version)\n         Deprecated\n    107. [`Sec-CH-UA-Full-Version-List`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Sec-CH-UA-Full-Version-List)\n         Experimental\n    108. [`Sec-CH-UA-Mobile`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Sec-CH-UA-Mobile)\n         Experimental\n    109. [`Sec-CH-UA-Model`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Sec-CH-UA-Model)\n         Experimental\n    110. [`Sec-CH-UA-Platform`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Sec-CH-UA-Platform)\n         Experimental\n    111. [`Sec-CH-UA-Platform-Version`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Sec-CH-UA-Platform-Version)\n         Experimental\n    112. [`Sec-CH-UA-WoW64`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Sec-CH-UA-WoW64)\n         Experimental\n    113. [`Sec-CH-Viewport-Height`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Sec-CH-Viewport-Height)\n         Experimental\n    114. [`Sec-CH-Viewport-Width`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Sec-CH-Viewport-Width)\n         Experimental\n    115. [`Sec-CH-Width`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Sec-CH-Width)\n         Experimental\n    116. [`Sec-Fetch-Dest`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Sec-Fetch-Dest)\n    117. [`Sec-Fetch-Mode`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Sec-Fetch-Mode)\n    118. [`Sec-Fetch-Site`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Sec-Fetch-Site)\n    119. [`Sec-Fetch-Storage-Access`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Sec-Fetch-Storage-Access)\n    120. [`Sec-Fetch-User`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Sec-Fetch-User)\n    121. [`Sec-GPC`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Sec-GPC)\n         Experimental\n    122. [`Sec-Private-State-Token`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Sec-Private-State-Token)\n         Experimental\n    123. [`Sec-Private-State-Token-Crypto-Version`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Sec-Private-State-Token-Crypto-Version)\n         Experimental\n    124. [`Sec-Private-State-Token-Lifetime`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Sec-Private-State-Token-Lifetime)\n         Experimental\n    125. [`Sec-Purpose`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Sec-Purpose)\n    126. [`Sec-Redemption-Record`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Sec-Redemption-Record)\n         Experimental\n    127. [`Sec-Speculation-Tags`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Sec-Speculation-Tags)\n         Experimental\n    128. [`Sec-WebSocket-Accept`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Sec-WebSocket-Accept)\n    129. [`Sec-WebSocket-Extensions`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Sec-WebSocket-Extensions)\n    130. [`Sec-WebSocket-Key`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Sec-WebSocket-Key)\n    131. [`Sec-WebSocket-Protocol`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Sec-WebSocket-Protocol)\n    132. [`Sec-WebSocket-Version`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Sec-WebSocket-Version)\n    133. [`Server`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Server)\n    134. [`Server-Timing`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Server-Timing)\n    135. [`Service-Worker`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Service-Worker)\n    136. [`Service-Worker-Allowed`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Service-Worker-Allowed)\n    137. [`Service-Worker-Navigation-Preload`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Service-Worker-Navigation-Preload)\n    138. [`Set-Cookie`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Set-Cookie)\n    139. [`Set-Login`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Set-Login)\n    140. [`SourceMap`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/SourceMap)\n    141. [`Speculation-Rules`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Speculation-Rules)\n         Experimental\n    142. [`Strict-Transport-Security`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Strict-Transport-Security)\n    143. [`Supports-Loading-Mode`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Supports-Loading-Mode)\n         Experimental\n    144. [`TE`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/TE)\n    145. [`Timing-Allow-Origin`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Timing-Allow-Origin)\n    146. [`Tk`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Tk)\n         Non-standard\n         Deprecated\n    147. [`Trailer`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Trailer)\n    148. [`Transfer-Encoding`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Transfer-Encoding)\n    149. [`Upgrade`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Upgrade)\n    150. [`Upgrade-Insecure-Requests`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Upgrade-Insecure-Requests)\n    151. [`Use-As-Dictionary`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Use-As-Dictionary)\n         Experimental\n    152. [`User-Agent`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/User-Agent)\n    153. [`Vary`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Vary)\n    154. [`Via`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Via)\n    155. [`Viewport-Width`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Viewport-Width)\n         Non-standard\n         Deprecated\n    156. [`Want-Content-Digest`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Want-Content-Digest)\n    157. [`Want-Repr-Digest`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Want-Repr-Digest)\n    158. [`Warning`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Warning)\n         Deprecated\n    159. [`Width`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Width)\n         Non-standard\n         Deprecated\n    160. [`WWW-Authenticate`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/WWW-Authenticate)\n    161. [`X-Content-Type-Options`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/X-Content-Type-Options)\n    162. [`X-DNS-Prefetch-Control`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/X-DNS-Prefetch-Control)\n         Non-standard\n    163. [`X-Forwarded-For`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/X-Forwarded-For)\n         Non-standard\n    164. [`X-Forwarded-Host`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/X-Forwarded-Host)\n         Non-standard\n    165. [`X-Forwarded-Proto`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/X-Forwarded-Proto)\n         Non-standard\n    166. [`X-Frame-Options`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/X-Frame-Options)\n    167. [`X-Permitted-Cross-Domain-Policies`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/X-Permitted-Cross-Domain-Policies)\n         Non-standard\n    168. [`X-Powered-By`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/X-Powered-By)\n         Non-standard\n    169. [`X-Robots-Tag`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/X-Robots-Tag)\n         Non-standard\n    170. [`X-XSS-Protection`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/X-XSS-Protection)\n         Non-standard\n         Deprecated\n27. [HTTP request methods](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Methods)\n    \n    1. [`CONNECT`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Methods\/CONNECT)\n    2. [`DELETE`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Methods\/DELETE)\n    3. [`GET`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Methods\/GET)\n    4. [`HEAD`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Methods\/HEAD)\n    5. [`OPTIONS`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Methods\/OPTIONS)\n    6. [`PATCH`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Methods\/PATCH)\n    7. [`POST`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Methods\/POST)\n    8. [`PUT`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Methods\/PUT)\n    9. [`TRACE`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Methods\/TRACE)\n28. *[HTTP response status codes](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status)*\n    \n    1. [`100 Continue`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/100)\n    2. [`101 Switching Protocols`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/101)\n    3. [`102 Processing`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/102)\n    4. [`103 Early Hints`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/103)\n    5. [`200 OK`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/200)\n    6. [`201 Created`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/201)\n    7. [`202 Accepted`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/202)\n    8. [`203 Non-Authoritative Information`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/203)\n    9. [`204 No Content`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/204)\n    10. [`205 Reset Content`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/205)\n    11. [`206 Partial Content`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/206)\n    12. [`207 Multi-Status`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/207)\n    13. [`208 Already Reported`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/208)\n    14. [`226 IM Used`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/226)\n    15. [`300 Multiple Choices`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/300)\n    16. [`301 Moved Permanently`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/301)\n    17. [`302 Found`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/302)\n    18. [`303 See Other`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/303)\n    19. [`304 Not Modified`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/304)\n    20. [`307 Temporary Redirect`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/307)\n    21. [`308 Permanent Redirect`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/308)\n    22. [`400 Bad Request`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/400)\n    23. [`401 Unauthorized`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/401)\n    24. [`402 Payment Required`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/402)\n    25. [`403 Forbidden`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/403)\n    26. [`404 Not Found`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/404)\n    27. [`405 Method Not Allowed`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/405)\n    28. [`406 Not Acceptable`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/406)\n    29. [`407 Proxy Authentication Required`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/407)\n    30. [`408 Request Timeout`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/408)\n    31. [`409 Conflict`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/409)\n    32. [`410 Gone`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/410)\n    33. [`411 Length Required`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/411)\n    34. [`412 Precondition Failed`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/412)\n    35. [`413 Content Too Large`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/413)\n    36. [`414 URI Too Long`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/414)\n    37. [`415 Unsupported Media Type`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/415)\n    38. [`416 Range Not Satisfiable`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/416)\n    39. [`417 Expectation Failed`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/417)\n    40. [`418 I'm a teapot`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/418)\n    41. [`421 Misdirected Request`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/421)\n    42. [`422 Unprocessable Content`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/422)\n    43. [`423 Locked`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/423)\n    44. [`424 Failed Dependency`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/424)\n    45. [`425 Too Early`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/425)\n    46. [`426 Upgrade Required`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/426)\n    47. [`428 Precondition Required`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/428)\n    48. [`429 Too Many Requests`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/429)\n    49. [`431 Request Header Fields Too Large`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/431)\n    50. [`451 Unavailable For Legal Reasons`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/451)\n    51. [`500 Internal Server Error`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/500)\n    52. [`501 Not Implemented`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/501)\n    53. [`502 Bad Gateway`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/502)\n    54. [`503 Service Unavailable`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/503)\n    55. [`504 Gateway Timeout`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/504)\n    56. [`505 HTTP Version Not Supported`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/505)\n    57. [`506 Variant Also Negotiates`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/506)\n    58. [`507 Insufficient Storage`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/507)\n    59. [`508 Loop Detected`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/508)\n    60. [`510 Not Extended`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/510)\n    61. [`511 Network Authentication Required`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/511)\n29. [CSP directives](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Content-Security-Policy#directives)\n    \n    1. [`base-uri`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Content-Security-Policy\/base-uri)\n    2. [`block-all-mixed-content`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Content-Security-Policy\/block-all-mixed-content)\n       Deprecated\n    3. [`child-src`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Content-Security-Policy\/child-src)\n    4. [`connect-src`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Content-Security-Policy\/connect-src)\n    5. [`default-src`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Content-Security-Policy\/default-src)\n    6. [`fenced-frame-src`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Content-Security-Policy\/fenced-frame-src)\n       Experimental\n    7. [`font-src`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Content-Security-Policy\/font-src)\n    8. [`form-action`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Content-Security-Policy\/form-action)\n    9. [`frame-ancestors`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Content-Security-Policy\/frame-ancestors)\n    10. [`frame-src`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Content-Security-Policy\/frame-src)\n    11. [`img-src`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Content-Security-Policy\/img-src)\n    12. [`manifest-src`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Content-Security-Policy\/manifest-src)\n    13. [`media-src`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Content-Security-Policy\/media-src)\n    14. [`object-src`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Content-Security-Policy\/object-src)\n    15. [`prefetch-src`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Content-Security-Policy\/prefetch-src)\n        Non-standard\n        Deprecated\n    16. [`report-to`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Content-Security-Policy\/report-to)\n    17. [`report-uri`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Content-Security-Policy\/report-uri)\n        Deprecated\n    18. [`require-trusted-types-for`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Content-Security-Policy\/require-trusted-types-for)\n    19. [`sandbox`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Content-Security-Policy\/sandbox)\n    20. [`script-src`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Content-Security-Policy\/script-src)\n    21. [`script-src-attr`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Content-Security-Policy\/script-src-attr)\n    22. [`script-src-elem`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Content-Security-Policy\/script-src-elem)\n    23. [`style-src`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Content-Security-Policy\/style-src)\n    24. [`style-src-attr`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Content-Security-Policy\/style-src-attr)\n    25. [`style-src-elem`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Content-Security-Policy\/style-src-elem)\n    26. [`trusted-types`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Content-Security-Policy\/trusted-types)\n    27. [`upgrade-insecure-requests`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Content-Security-Policy\/upgrade-insecure-requests)\n    28. [`worker-src`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Content-Security-Policy\/worker-src)\n30. [Permissions-Policy directives](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Permissions-Policy#directives)\n    \n    Experimental\n    \n    1. [`accelerometer`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Permissions-Policy\/accelerometer)\n       Experimental\n    2. [`ambient-light-sensor`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Permissions-Policy\/ambient-light-sensor)\n       Experimental\n    3. [`aria-notify`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Permissions-Policy\/aria-notify)\n       Experimental\n    4. [`attribution-reporting`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Permissions-Policy\/attribution-reporting)\n       Deprecated\n    5. [`autoplay`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Permissions-Policy\/autoplay)\n       Experimental\n    6. [`bluetooth`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Permissions-Policy\/bluetooth)\n       Experimental\n    7. [`browsing-topics`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Permissions-Policy\/browsing-topics)\n       Non-standard\n       Deprecated\n    8. [`camera`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Permissions-Policy\/camera)\n       Experimental\n    9. [`captured-surface-control`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Permissions-Policy\/captured-surface-control)\n       Experimental\n    10. [`ch-ua-high-entropy-values`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Permissions-Policy\/ch-ua-high-entropy-values)\n        Experimental\n    11. [`compute-pressure`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Permissions-Policy\/compute-pressure)\n        Experimental\n    12. [`cross-origin-isolated`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Permissions-Policy\/cross-origin-isolated)\n        Experimental\n    13. [`deferred-fetch`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Permissions-Policy\/deferred-fetch)\n        Experimental\n    14. [`deferred-fetch-minimal`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Permissions-Policy\/deferred-fetch-minimal)\n        Experimental\n    15. [`display-capture`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Permissions-Policy\/display-capture)\n        Experimental\n    16. [`encrypted-media`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Permissions-Policy\/encrypted-media)\n        Experimental\n    17. [`fullscreen`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Permissions-Policy\/fullscreen)\n        Experimental\n    18. [`gamepad`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Permissions-Policy\/gamepad)\n        Experimental\n    19. [`geolocation`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Permissions-Policy\/geolocation)\n        Experimental\n    20. [`gyroscope`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Permissions-Policy\/gyroscope)\n        Experimental\n    21. [`hid`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Permissions-Policy\/hid)\n        Experimental\n    22. [`identity-credentials-get`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Permissions-Policy\/identity-credentials-get)\n        Experimental\n    23. [`idle-detection`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Permissions-Policy\/idle-detection)\n        Experimental\n    24. [`language-detector`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Permissions-Policy\/language-detector)\n        Experimental\n    25. [`local-fonts`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Permissions-Policy\/local-fonts)\n        Experimental\n    26. [`magnetometer`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Permissions-Policy\/magnetometer)\n        Experimental\n    27. [`microphone`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Permissions-Policy\/microphone)\n        Experimental\n    28. [`midi`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Permissions-Policy\/midi)\n        Experimental\n    29. [`on-device-speech-recognition`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Permissions-Policy\/on-device-speech-recognition)\n        Experimental\n    30. [`otp-credentials`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Permissions-Policy\/otp-credentials)\n        Experimental\n    31. [`payment`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Permissions-Policy\/payment)\n        Experimental\n    32. [`picture-in-picture`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Permissions-Policy\/picture-in-picture)\n        Experimental\n    33. [`private-state-token-issuance`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Permissions-Policy\/private-state-token-issuance)\n        Experimental\n    34. [`private-state-token-redemption`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Permissions-Policy\/private-state-token-redemption)\n        Experimental\n    35. [`publickey-credentials-create`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Permissions-Policy\/publickey-credentials-create)\n        Experimental\n    36. [`publickey-credentials-get`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Permissions-Policy\/publickey-credentials-get)\n        Experimental\n    37. [`screen-wake-lock`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Permissions-Policy\/screen-wake-lock)\n        Experimental\n    38. [`serial`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Permissions-Policy\/serial)\n        Experimental\n    39. [`speaker-selection`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Permissions-Policy\/speaker-selection)\n        Experimental\n    40. [`storage-access`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Permissions-Policy\/storage-access)\n        Experimental\n    41. [`summarizer`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Permissions-Policy\/summarizer)\n        Experimental\n    42. [`translator`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Permissions-Policy\/translator)\n        Experimental\n    43. [`usb`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Permissions-Policy\/usb)\n        Experimental\n    44. [`web-share`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Permissions-Policy\/web-share)\n        Experimental\n    45. [`window-management`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Permissions-Policy\/window-management)\n        Experimental\n    46. [`xr-spatial-tracking`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Permissions-Policy\/xr-spatial-tracking)\n        Experimental\n31. [HTTP resources and specifications](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Resources_and_specifications)\n\nYour blueprint for a better internet.\n\nMDN\n\n- [About](https:\/\/developer.mozilla.org\/en-US\/about)\n- [Blog](https:\/\/developer.mozilla.org\/en-US\/blog\/)\n- [Mozilla careers](https:\/\/www.mozilla.org\/en-US\/careers\/listings\/)\n- [Advertise with us](https:\/\/developer.mozilla.org\/en-US\/advertising)\n- [MDN Plus](https:\/\/developer.mozilla.org\/en-US\/plus)\n- [Product help](https:\/\/support.mozilla.org\/products\/mdn-plus)\n\nContribute\n\n- [MDN Community](https:\/\/developer.mozilla.org\/en-US\/community)\n- [Community resources](https:\/\/developer.mozilla.org\/en-US\/docs\/MDN\/Community)\n- [Writing guidelines](https:\/\/developer.mozilla.org\/en-US\/docs\/MDN\/Writing_guidelines)\n- [MDN Discord](https:\/\/developer.mozilla.org\/discord)\n- [MDN on GitHub](https:\/\/github.com\/mdn)\n\nDevelopers\n\n- [Web technologies](https:\/\/developer.mozilla.org\/en-US\/docs\/Web)\n- [Learn web development](https:\/\/developer.mozilla.org\/en-US\/docs\/Learn_web_development)\n- [Guides](https:\/\/developer.mozilla.org\/en-US\/docs\/MDN\/Guides)\n- [Tutorials](https:\/\/developer.mozilla.org\/en-US\/docs\/MDN\/Tutorials)\n- [Glossary](https:\/\/developer.mozilla.org\/en-US\/docs\/Glossary)\n- [Hacks blog](https:\/\/hacks.mozilla.org\/)\n\n- [Website Privacy Notice](https:\/\/www.mozilla.org\/privacy\/websites\/)\n- [Telemetry Settings](https:\/\/www.mozilla.org\/en-US\/privacy\/websites\/data-preferences\/)\n- [Legal](https:\/\/www.mozilla.org\/about\/legal\/terms\/mozilla)\n- [Community Participation Guidelines](https:\/\/www.mozilla.org\/about\/governance\/policies\/participation\/)\n\nVisit [Mozilla Corporation’s](https:\/\/www.mozilla.org\/) not-for-profit parent, the [Mozilla Foundation](https:\/\/foundation.mozilla.org\/).  \n Portions of this content are ©1998–2026 by individual mozilla.org contributors. Content available under [a Creative Commons license](https:\/\/developer.mozilla.org\/docs\/MDN\/Writing_guidelines\/Attrib_copyright_license).","attrs_readable_markdown":"## [Informational responses](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status#informational_responses)\n[`100 Continue`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/100)\n\nThis interim response indicates that the client should continue the request or ignore the response if the request is already finished.\n\n[`101 Switching Protocols`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/101)\n\nThis code is sent in response to an [`Upgrade`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Upgrade) request header from the client and indicates the protocol the server is switching to.\n\n[`102 Processing`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/102)\n\nDeprecated\n\nThis code was used in [WebDAV](https:\/\/developer.mozilla.org\/en-US\/docs\/Glossary\/WebDAV) contexts to indicate that a request has been received by the server, but no status was available at the time of the response.\n\n[`103 Early Hints`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/103)\n\nThis status code is primarily intended to be used with the [`Link`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Link) header, letting the user agent start [preloading](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTML\/Reference\/Attributes\/rel\/preload) resources while the server prepares a response or [preconnect](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTML\/Reference\/Attributes\/rel\/preconnect) to an origin from which the page will need resources.\n\n## [Successful responses](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status#successful_responses)\n[`200 OK`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/200)\n\nThe request succeeded. The result and meaning of \"success\" depends on the HTTP method:\n\n- [`GET`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Methods\/GET): The resource has been fetched and transmitted in the message body.\n- [`HEAD`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Methods\/HEAD): Representation headers are included in the response without any message body.\n- [`PUT`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Methods\/PUT) or [`POST`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Methods\/POST): The resource describing the result of the action is transmitted in the message body.\n- [`TRACE`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Methods\/TRACE): The message body contains the request as received by the server.\n\n[`201 Created`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/201)\n\nThe request succeeded, and a new resource was created as a result. This is typically the response sent after [`POST`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Methods\/POST) requests, or some [`PUT`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Methods\/PUT) requests.\n\n[`202 Accepted`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/202)\n\nThe request has been received but not yet acted upon. It is noncommittal, since there is no way in HTTP to later send an asynchronous response indicating the outcome of the request. It is intended for cases where another process or server handles the request, or for batch processing.\n\nThis response code means the returned metadata is not exactly the same as is available from the origin server, but is collected from a local or a third-party copy. This is mostly used for mirrors or backups of another resource. Except for that specific case, the [`200 OK`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/200) response is preferred to this status.\n\n[`204 No Content`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/204)\n\nThere is no content to send for this request, but the headers are useful. The user agent may update its cached headers for this resource with the new ones.\n\n[`205 Reset Content`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/205)\n\nTells the user agent to reset the document which sent this request.\n\n[`206 Partial Content`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/206)\n\nThis response code is used in response to a [range request](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/Range_requests) when the client has requested a part or parts of a resource.\n\n[`207 Multi-Status`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/207) ([WebDAV](https:\/\/developer.mozilla.org\/en-US\/docs\/Glossary\/WebDAV))\n\nConveys information about multiple resources, for situations where multiple status codes might be appropriate.\n\n[`208 Already Reported`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/208) ([WebDAV](https:\/\/developer.mozilla.org\/en-US\/docs\/Glossary\/WebDAV))\n\nUsed inside a `<dav:propstat>` response element to avoid repeatedly enumerating the internal members of multiple bindings to the same collection.\n\n[`226 IM Used`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/226) ([HTTP Delta encoding](https:\/\/datatracker.ietf.org\/doc\/html\/rfc3229))\n\nThe server has fulfilled a [`GET`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Methods\/GET) request for the resource, and the response is a representation of the result of one or more instance-manipulations applied to the current instance.\n\n## [Redirection messages](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status#redirection_messages)\n[`300 Multiple Choices`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/300)\n\nIn [agent-driven content negotiation](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/Content_negotiation#agent-driven_negotiation), the request has more than one possible response and the user agent or user should choose one of them. There is no standardized way for clients to automatically choose one of the responses, so this is rarely used.\n\n[`301 Moved Permanently`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/301)\n\nThe URL of the requested resource has been changed permanently. The new URL is given in the response.\n\n[`302 Found`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/302)\n\nThis response code means that the URI of requested resource has been changed *temporarily*. Further changes in the URI might be made in the future, so the same URI should be used by the client in future requests.\n\n[`303 See Other`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/303)\n\nThe server sent this response to direct the client to get the requested resource at another URI with a [`GET`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Methods\/GET) request.\n\n[`304 Not Modified`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/304)\n\nThis is used for caching purposes. It tells the client that the response has not been modified, so the client can continue to use the same [cached](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/Caching) version of the response.\n\n[`305 Use Proxy` Deprecated](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status#305_use_proxy)\n\nDefined in a previous version of the HTTP specification to indicate that a requested response must be accessed by a proxy. It has been deprecated due to security concerns regarding in-band configuration of a proxy.\n\n[`306 unused`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status#306_unused)\n\nThis response code is no longer used; but is reserved. It was used in a previous version of the HTTP\/1.1 specification.\n\n[`307 Temporary Redirect`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/307)\n\nThe server sends this response to direct the client to get the requested resource at another URI with the same method that was used in the prior request. This has the same semantics as the `302 Found` response code, with the exception that the user agent *must not* change the HTTP method used: if a [`POST`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Methods\/POST) was used in the first request, a `POST` must be used in the redirected request.\n\n[`308 Permanent Redirect`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/308)\n\nThis means that the resource is now permanently located at another URI, specified by the [`Location`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Location) response header. This has the same semantics as the `301 Moved Permanently` HTTP response code, with the exception that the user agent *must not* change the HTTP method used: if a [`POST`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Methods\/POST) was used in the first request, a `POST` must be used in the second request.\n\n## [Client error responses](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status#client_error_responses)\n[`400 Bad Request`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/400)\n\nThe server cannot or will not process the request due to something that is perceived to be a client error (e.g., malformed request syntax, invalid request message framing, or deceptive request routing).\n\n[`401 Unauthorized`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/401)\n\nAlthough the HTTP standard specifies \"unauthorized\", semantically this response means \"unauthenticated\". That is, the client must authenticate itself to get the requested response.\n\n[`402 Payment Required`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/402)\n\nThe initial purpose of this code was for digital payment systems, however this status code is rarely used and no standard convention exists.\n\n[`403 Forbidden`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/403)\n\nThe client does not have access rights to the content; that is, it is unauthorized, so the server is refusing to give the requested resource. Unlike `401 Unauthorized`, the client's identity is known to the server.\n\n[`404 Not Found`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/404)\n\nThe server cannot find the requested resource. In the browser, this means the URL is not recognized. In an API, this can also mean that the endpoint is valid but the resource itself does not exist. Servers may also send this response instead of `403 Forbidden` to hide the existence of a resource from an unauthorized client. This response code is probably the most well known due to its frequent occurrence on the web.\n\n[`405 Method Not Allowed`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/405)\n\nThe [request method](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Methods) is known by the server but is not supported by the target resource. For example, an API may not allow `DELETE` on a resource, or the `TRACE` method entirely.\n\n[`406 Not Acceptable`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/406)\n\nThis response is sent when the web server, after performing [server-driven content negotiation](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/Content_negotiation#server-driven_content_negotiation), doesn't find any content that conforms to the criteria given by the user agent.\n\n[`407 Proxy Authentication Required`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/407)\n\nThis is similar to `401 Unauthorized` but authentication is needed to be done by a proxy.\n\n[`408 Request Timeout`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/408)\n\nThis response is sent on an idle connection by some servers, even without any previous request by the client. It means that the server would like to shut down this unused connection. This response is used much more since some browsers use HTTP pre-connection mechanisms to speed up browsing. Some servers may shut down a connection without sending this message.\n\n[`409 Conflict`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/409)\n\nThis response is sent when a request conflicts with the current state of the server. In [WebDAV](https:\/\/developer.mozilla.org\/en-US\/docs\/Glossary\/WebDAV) remote web authoring, `409` responses are errors sent to the client so that a user might be able to resolve a conflict and resubmit the request.\n\n[`410 Gone`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/410)\n\nThis response is sent when the requested content has been permanently deleted from server, with no forwarding address. Clients are expected to remove their caches and links to the resource. The HTTP specification intends this status code to be used for \"limited-time, promotional services\". APIs should not feel compelled to indicate resources that have been deleted with this status code.\n\n[`411 Length Required`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/411)\n\nServer rejected the request because the [`Content-Length`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Content-Length) header field is not defined and the server requires it.\n\n[`412 Precondition Failed`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/412)\n\nIn [conditional requests](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/Conditional_requests), the client has indicated preconditions in its headers which the server does not meet.\n\n[`413 Content Too Large`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/413)\n\nThe request body is larger than limits defined by server. The server might close the connection or return a [`Retry-After`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Retry-After) header field.\n\n[`414 URI Too Long`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/414)\n\nThe URI requested by the client is longer than the server is willing to interpret.\n\n[`415 Unsupported Media Type`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/415)\n\nThe media format of the requested data is not supported by the server, so the server is rejecting the request.\n\n[`416 Range Not Satisfiable`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/416)\n\nThe [ranges](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/Range_requests) specified by the `Range` header field in the request cannot be fulfilled. It's possible that the range is outside the size of the target resource's data.\n\n[`417 Expectation Failed`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/417)\n\nThis response code means the expectation indicated by the [`Expect`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Expect) request header field cannot be met by the server.\n\n[`418 I'm a teapot`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/418)\n\nThe server refuses the attempt to brew coffee with a teapot.\n\n[`421 Misdirected Request`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/421)\n\nThe request was directed at a server that is not able to produce a response. This can be sent by a server that is not configured to produce responses for the combination of scheme and authority that are included in the request URI.\n\n[`422 Unprocessable Content`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/422) ([WebDAV](https:\/\/developer.mozilla.org\/en-US\/docs\/Glossary\/WebDAV))\n\nThe request was well-formed but was unable to be followed due to semantic errors.\n\n[`423 Locked`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/423) ([WebDAV](https:\/\/developer.mozilla.org\/en-US\/docs\/Glossary\/WebDAV))\n\nThe resource that is being accessed is locked.\n\n[`424 Failed Dependency`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/424) ([WebDAV](https:\/\/developer.mozilla.org\/en-US\/docs\/Glossary\/WebDAV))\n\nThe request failed due to failure of a previous request.\n\n[`425 Too Early`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/425)\n\nExperimental\n\nIndicates that the server is unwilling to risk processing a request that might be replayed.\n\n[`426 Upgrade Required`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/426)\n\nThe server refuses to perform the request using the current protocol but might be willing to do so after the client upgrades to a different protocol. The server sends an [`Upgrade`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Upgrade) header in a 426 response to indicate the required protocol(s).\n\n[`428 Precondition Required`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/428)\n\nThe origin server requires the request to be [conditional](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Guides\/Conditional_requests). This response is intended to prevent the 'lost update' problem, where a client [`GET`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Methods\/GET)s a resource's state, modifies it and [`PUT`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Methods\/PUT)s it back to the server, when meanwhile a third party has modified the state on the server, leading to a conflict.\n\n[`429 Too Many Requests`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/429)\n\nThe user has sent too many requests in a given amount of time ([rate limiting](https:\/\/developer.mozilla.org\/en-US\/docs\/Glossary\/Rate_limit)).\n\n[`431 Request Header Fields Too Large`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/431)\n\nThe server is unwilling to process the request because its header fields are too large. The request may be resubmitted after reducing the size of the request header fields.\n\n[`451 Unavailable For Legal Reasons`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/451)\n\nThe user agent requested a resource that cannot legally be provided, such as a web page censored by a government.\n\n## [Server error responses](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status#server_error_responses)\n[`500 Internal Server Error`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/500)\n\nThe server has encountered a situation it does not know how to handle. This error is generic, indicating that the server cannot find a more appropriate `5XX` status code to respond with.\n\n[`501 Not Implemented`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/501)\n\nThe request method is not supported by the server and cannot be handled. The only methods that servers are required to support (and therefore must not return this code) are [`GET`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Methods\/GET) and [`HEAD`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Methods\/HEAD).\n\n[`502 Bad Gateway`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/502)\n\nThis error response means that the server, while working as a gateway to get a response needed to handle the request, got an invalid response.\n\n[`503 Service Unavailable`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/503)\n\nThe server is not ready to handle the request. Common causes are a server that is down for maintenance or that is overloaded. Note that together with this response, a user-friendly page explaining the problem should be sent. This response should be used for temporary conditions and the [`Retry-After`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Headers\/Retry-After) HTTP header should, if possible, contain the estimated time before the recovery of the service. The webmaster must also take care about the caching-related headers that are sent along with this response, as these temporary condition responses should usually not be cached.\n\n[`504 Gateway Timeout`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/504)\n\nThis error response is given when the server is acting as a gateway and cannot get a response in time.\n\n[`505 HTTP Version Not Supported`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/505)\n\nThe HTTP version used in the request is not supported by the server.\n\n[`506 Variant Also Negotiates`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/506)\n\nThe server has an internal configuration error: during content negotiation, the chosen variant is configured to engage in content negotiation itself, which results in circular references when creating responses.\n\n[`507 Insufficient Storage`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/507) ([WebDAV](https:\/\/developer.mozilla.org\/en-US\/docs\/Glossary\/WebDAV))\n\nThe method could not be performed on the resource because the server is unable to store the representation needed to successfully complete the request.\n\n[`508 Loop Detected`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/508) ([WebDAV](https:\/\/developer.mozilla.org\/en-US\/docs\/Glossary\/WebDAV))\n\nThe server detected an infinite loop while processing the request.\n\n[`510 Not Extended`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/510)\n\nThe client request declares an HTTP Extension ([RFC 2774](https:\/\/datatracker.ietf.org\/doc\/html\/rfc2774)) that should be used to process the request, but the extension is not supported.\n\n[`511 Network Authentication Required`](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status\/511)\n\nIndicates that the client needs to authenticate to gain network access.\n## [Browser compatibility](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status#browser_compatibility)\n## [See also](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Reference\/Status#see_also)\n- [List of HTTP status codes on Wikipedia](https:\/\/en.wikipedia.org\/wiki\/List_of_HTTP_status_codes)\n- [IANA official registry of HTTP status codes](https:\/\/www.iana.org\/assignments\/http-status-codes\/http-status-codes.xhtml)","meta_canonical":null}

3. Robots.txt Check

Query:

Response:

4. Spam/Ban Check

Query:

Response:

5. Seen Status Check

ℹ️ Skipped - page is already crawled

📄

INDEXABLE

✅

CRAWLED

2 days ago

🤖

ROBOTS ALLOWED

Page Info Filters

Filter	Status	Condition	Details
HTTP status	PASS	`download_http_code = 200`	HTTP 200
Age cutoff	PASS	`download_stamp > now() - 6 MONTH`	0.1 months ago
History drop	PASS	`isNull(history_drop_reason)`	No drop reason
Spam/ban	PASS	`fh_dont_index != 1 AND ml_spam_score = 0`	ml_spam_score=0
Canonical	PASS	`meta_canonical IS NULL OR = '' OR = src_unparsed`	Not set

Page Details

Property	Value
URL	https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status
Last Crawled	2026-04-14 23:26:28 (2 days ago)
First Indexed	2025-03-14 01:26:59 (1 year ago)
HTTP Status Code	200
Meta Title	HTTP response status codes - HTTP \| MDN
Meta Description	HTTP response status codes indicate whether a specific HTTP request has been successfully completed. Responses are grouped in five classes:
Meta Canonical	null
Boilerpipe Text	Informational responses 100 Continue This interim response indicates that the client should continue the request or ignore the response if the request is already finished. 101 Switching Protocols This code is sent in response to an Upgrade request header from the client and indicates the protocol the server is switching to. 102 Processing Deprecated This code was used in WebDAV contexts to indicate that a request has been received by the server, but no status was available at the time of the response. 103 Early Hints This status code is primarily intended to be used with the Link header, letting the user agent start preloading resources while the server prepares a response or preconnect to an origin from which the page will need resources. Successful responses 200 OK The request succeeded. The result and meaning of "success" depends on the HTTP method: GET : The resource has been fetched and transmitted in the message body. HEAD : Representation headers are included in the response without any message body. PUT or POST : The resource describing the result of the action is transmitted in the message body. TRACE : The message body contains the request as received by the server. 201 Created The request succeeded, and a new resource was created as a result. This is typically the response sent after POST requests, or some PUT requests. 202 Accepted The request has been received but not yet acted upon. It is noncommittal, since there is no way in HTTP to later send an asynchronous response indicating the outcome of the request. It is intended for cases where another process or server handles the request, or for batch processing. This response code means the returned metadata is not exactly the same as is available from the origin server, but is collected from a local or a third-party copy. This is mostly used for mirrors or backups of another resource. Except for that specific case, the 200 OK response is preferred to this status. 204 No Content There is no content to send for this request, but the headers are useful. The user agent may update its cached headers for this resource with the new ones. 205 Reset Content Tells the user agent to reset the document which sent this request. 206 Partial Content This response code is used in response to a range request when the client has requested a part or parts of a resource. 207 Multi-Status ( WebDAV ) Conveys information about multiple resources, for situations where multiple status codes might be appropriate. 208 Already Reported ( WebDAV ) Used inside a <dav:propstat> response element to avoid repeatedly enumerating the internal members of multiple bindings to the same collection. 226 IM Used ( HTTP Delta encoding ) The server has fulfilled a GET request for the resource, and the response is a representation of the result of one or more instance-manipulations applied to the current instance. Redirection messages 300 Multiple Choices In agent-driven content negotiation , the request has more than one possible response and the user agent or user should choose one of them. There is no standardized way for clients to automatically choose one of the responses, so this is rarely used. 301 Moved Permanently The URL of the requested resource has been changed permanently. The new URL is given in the response. 302 Found This response code means that the URI of requested resource has been changed temporarily . Further changes in the URI might be made in the future, so the same URI should be used by the client in future requests. 303 See Other The server sent this response to direct the client to get the requested resource at another URI with a GET request. 304 Not Modified This is used for caching purposes. It tells the client that the response has not been modified, so the client can continue to use the same cached version of the response. 305 Use Proxy Deprecated Defined in a previous version of the HTTP specification to indicate that a requested response must be accessed by a proxy. It has been deprecated due to security concerns regarding in-band configuration of a proxy. 306 unused This response code is no longer used; but is reserved. It was used in a previous version of the HTTP/1.1 specification. 307 Temporary Redirect The server sends this response to direct the client to get the requested resource at another URI with the same method that was used in the prior request. This has the same semantics as the 302 Found response code, with the exception that the user agent must not change the HTTP method used: if a POST was used in the first request, a POST must be used in the redirected request. 308 Permanent Redirect This means that the resource is now permanently located at another URI, specified by the Location response header. This has the same semantics as the 301 Moved Permanently HTTP response code, with the exception that the user agent must not change the HTTP method used: if a POST was used in the first request, a POST must be used in the second request. Client error responses 400 Bad Request The server cannot or will not process the request due to something that is perceived to be a client error (e.g., malformed request syntax, invalid request message framing, or deceptive request routing). 401 Unauthorized Although the HTTP standard specifies "unauthorized", semantically this response means "unauthenticated". That is, the client must authenticate itself to get the requested response. 402 Payment Required The initial purpose of this code was for digital payment systems, however this status code is rarely used and no standard convention exists. 403 Forbidden The client does not have access rights to the content; that is, it is unauthorized, so the server is refusing to give the requested resource. Unlike 401 Unauthorized , the client's identity is known to the server. 404 Not Found The server cannot find the requested resource. In the browser, this means the URL is not recognized. In an API, this can also mean that the endpoint is valid but the resource itself does not exist. Servers may also send this response instead of 403 Forbidden to hide the existence of a resource from an unauthorized client. This response code is probably the most well known due to its frequent occurrence on the web. 405 Method Not Allowed The request method is known by the server but is not supported by the target resource. For example, an API may not allow DELETE on a resource, or the TRACE method entirely. 406 Not Acceptable This response is sent when the web server, after performing server-driven content negotiation , doesn't find any content that conforms to the criteria given by the user agent. 407 Proxy Authentication Required This is similar to 401 Unauthorized but authentication is needed to be done by a proxy. 408 Request Timeout This response is sent on an idle connection by some servers, even without any previous request by the client. It means that the server would like to shut down this unused connection. This response is used much more since some browsers use HTTP pre-connection mechanisms to speed up browsing. Some servers may shut down a connection without sending this message. 409 Conflict This response is sent when a request conflicts with the current state of the server. In WebDAV remote web authoring, 409 responses are errors sent to the client so that a user might be able to resolve a conflict and resubmit the request. 410 Gone This response is sent when the requested content has been permanently deleted from server, with no forwarding address. Clients are expected to remove their caches and links to the resource. The HTTP specification intends this status code to be used for "limited-time, promotional services". APIs should not feel compelled to indicate resources that have been deleted with this status code. 411 Length Required Server rejected the request because the Content-Length header field is not defined and the server requires it. 412 Precondition Failed In conditional requests , the client has indicated preconditions in its headers which the server does not meet. 413 Content Too Large The request body is larger than limits defined by server. The server might close the connection or return a Retry-After header field. 414 URI Too Long The URI requested by the client is longer than the server is willing to interpret. 415 Unsupported Media Type The media format of the requested data is not supported by the server, so the server is rejecting the request. 416 Range Not Satisfiable The ranges specified by the Range header field in the request cannot be fulfilled. It's possible that the range is outside the size of the target resource's data. 417 Expectation Failed This response code means the expectation indicated by the Expect request header field cannot be met by the server. 418 I'm a teapot The server refuses the attempt to brew coffee with a teapot. 421 Misdirected Request The request was directed at a server that is not able to produce a response. This can be sent by a server that is not configured to produce responses for the combination of scheme and authority that are included in the request URI. 422 Unprocessable Content ( WebDAV ) The request was well-formed but was unable to be followed due to semantic errors. 423 Locked ( WebDAV ) The resource that is being accessed is locked. 424 Failed Dependency ( WebDAV ) The request failed due to failure of a previous request. 425 Too Early Experimental Indicates that the server is unwilling to risk processing a request that might be replayed. 426 Upgrade Required The server refuses to perform the request using the current protocol but might be willing to do so after the client upgrades to a different protocol. The server sends an Upgrade header in a 426 response to indicate the required protocol(s). 428 Precondition Required The origin server requires the request to be conditional . This response is intended to prevent the 'lost update' problem, where a client GET s a resource's state, modifies it and PUT s it back to the server, when meanwhile a third party has modified the state on the server, leading to a conflict. 429 Too Many Requests The user has sent too many requests in a given amount of time ( rate limiting ). 431 Request Header Fields Too Large The server is unwilling to process the request because its header fields are too large. The request may be resubmitted after reducing the size of the request header fields. 451 Unavailable For Legal Reasons The user agent requested a resource that cannot legally be provided, such as a web page censored by a government. Server error responses 500 Internal Server Error The server has encountered a situation it does not know how to handle. This error is generic, indicating that the server cannot find a more appropriate 5XX status code to respond with. 501 Not Implemented The request method is not supported by the server and cannot be handled. The only methods that servers are required to support (and therefore must not return this code) are GET and HEAD . 502 Bad Gateway This error response means that the server, while working as a gateway to get a response needed to handle the request, got an invalid response. 503 Service Unavailable The server is not ready to handle the request. Common causes are a server that is down for maintenance or that is overloaded. Note that together with this response, a user-friendly page explaining the problem should be sent. This response should be used for temporary conditions and the Retry-After HTTP header should, if possible, contain the estimated time before the recovery of the service. The webmaster must also take care about the caching-related headers that are sent along with this response, as these temporary condition responses should usually not be cached. 504 Gateway Timeout This error response is given when the server is acting as a gateway and cannot get a response in time. 505 HTTP Version Not Supported The HTTP version used in the request is not supported by the server. 506 Variant Also Negotiates The server has an internal configuration error: during content negotiation, the chosen variant is configured to engage in content negotiation itself, which results in circular references when creating responses. 507 Insufficient Storage ( WebDAV ) The method could not be performed on the resource because the server is unable to store the representation needed to successfully complete the request. 508 Loop Detected ( WebDAV ) The server detected an infinite loop while processing the request. 510 Not Extended The client request declares an HTTP Extension ( RFC 2774 ) that should be used to process the request, but the extension is not supported. 511 Network Authentication Required Indicates that the client needs to authenticate to gain network access. Browser compatibility See also List of HTTP status codes on Wikipedia IANA official registry of HTTP status codes
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[Web](https://developer.mozilla.org/en-US/docs/Web) 2. [HTTP](https://developer.mozilla.org/en-US/docs/Web/HTTP) 3. [Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference) 4. [HTTP response status codes](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status) # HTTP response status codes HTTP response status codes indicate whether a specific [HTTP](https://developer.mozilla.org/en-US/docs/Web/HTTP) request has been successfully completed. Responses are grouped in five classes: 1. [Informational responses](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status#informational_responses) (`100` – `199`) 2. [Successful responses](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status#successful_responses) (`200` – `299`) 3. [Redirection messages](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status#redirection_messages) (`300` – `399`) 4. [Client error responses](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status#client_error_responses) (`400` – `499`) 5. [Server error responses](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status#server_error_responses) (`500` – `599`) The status codes listed below are defined by [RFC 9110](https://httpwg.org/specs/rfc9110.html#overview.of.status.codes). Note: If you receive a response that is not listed here, it is a non-standard response, possibly custom to the server's software. ## In this article - [Informational responses](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status#informational_responses) - [Successful responses](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status#successful_responses) - [Redirection messages](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status#redirection_messages) - [Client error responses](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status#client_error_responses) - [Server error responses](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status#server_error_responses) - [Browser compatibility](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status#browser_compatibility) - [See also](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status#see_also) ## [Informational responses](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status#informational_responses) [`100 Continue`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/100) This interim response indicates that the client should continue the request or ignore the response if the request is already finished. [`101 Switching Protocols`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/101) This code is sent in response to an [`Upgrade`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Upgrade) request header from the client and indicates the protocol the server is switching to. [`102 Processing`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/102) Deprecated This code was used in [WebDAV](https://developer.mozilla.org/en-US/docs/Glossary/WebDAV) contexts to indicate that a request has been received by the server, but no status was available at the time of the response. [`103 Early Hints`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/103) This status code is primarily intended to be used with the [`Link`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Link) header, letting the user agent start [preloading](https://developer.mozilla.org/en-US/docs/Web/HTML/Reference/Attributes/rel/preload) resources while the server prepares a response or [preconnect](https://developer.mozilla.org/en-US/docs/Web/HTML/Reference/Attributes/rel/preconnect) to an origin from which the page will need resources. ## [Successful responses](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status#successful_responses) [`200 OK`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/200) The request succeeded. The result and meaning of "success" depends on the HTTP method: - [`GET`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Methods/GET): The resource has been fetched and transmitted in the message body. - [`HEAD`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Methods/HEAD): Representation headers are included in the response without any message body. - [`PUT`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Methods/PUT) or [`POST`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Methods/POST): The resource describing the result of the action is transmitted in the message body. - [`TRACE`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Methods/TRACE): The message body contains the request as received by the server. [`201 Created`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/201) The request succeeded, and a new resource was created as a result. This is typically the response sent after [`POST`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Methods/POST) requests, or some [`PUT`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Methods/PUT) requests. [`202 Accepted`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/202) The request has been received but not yet acted upon. It is noncommittal, since there is no way in HTTP to later send an asynchronous response indicating the outcome of the request. It is intended for cases where another process or server handles the request, or for batch processing. [`203 Non-Authoritative Information`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/203) This response code means the returned metadata is not exactly the same as is available from the origin server, but is collected from a local or a third-party copy. This is mostly used for mirrors or backups of another resource. Except for that specific case, the [`200 OK`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/200) response is preferred to this status. [`204 No Content`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/204) There is no content to send for this request, but the headers are useful. The user agent may update its cached headers for this resource with the new ones. [`205 Reset Content`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/205) Tells the user agent to reset the document which sent this request. [`206 Partial Content`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/206) This response code is used in response to a [range request](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/Range_requests) when the client has requested a part or parts of a resource. [`207 Multi-Status`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/207) ([WebDAV](https://developer.mozilla.org/en-US/docs/Glossary/WebDAV)) Conveys information about multiple resources, for situations where multiple status codes might be appropriate. [`208 Already Reported`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/208) ([WebDAV](https://developer.mozilla.org/en-US/docs/Glossary/WebDAV)) Used inside a `<dav:propstat>` response element to avoid repeatedly enumerating the internal members of multiple bindings to the same collection. [`226 IM Used`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/226) ([HTTP Delta encoding](https://datatracker.ietf.org/doc/html/rfc3229)) The server has fulfilled a [`GET`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Methods/GET) request for the resource, and the response is a representation of the result of one or more instance-manipulations applied to the current instance. ## [Redirection messages](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status#redirection_messages) [`300 Multiple Choices`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/300) In [agent-driven content negotiation](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/Content_negotiation#agent-driven_negotiation), the request has more than one possible response and the user agent or user should choose one of them. There is no standardized way for clients to automatically choose one of the responses, so this is rarely used. [`301 Moved Permanently`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/301) The URL of the requested resource has been changed permanently. The new URL is given in the response. [`302 Found`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/302) This response code means that the URI of requested resource has been changed temporarily. Further changes in the URI might be made in the future, so the same URI should be used by the client in future requests. [`303 See Other`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/303) The server sent this response to direct the client to get the requested resource at another URI with a [`GET`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Methods/GET) request. [`304 Not Modified`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/304) This is used for caching purposes. It tells the client that the response has not been modified, so the client can continue to use the same [cached](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/Caching) version of the response. [`305 Use Proxy` Deprecated](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status#305_use_proxy) Defined in a previous version of the HTTP specification to indicate that a requested response must be accessed by a proxy. It has been deprecated due to security concerns regarding in-band configuration of a proxy. [`306 unused`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status#306_unused) This response code is no longer used; but is reserved. It was used in a previous version of the HTTP/1.1 specification. [`307 Temporary Redirect`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/307) The server sends this response to direct the client to get the requested resource at another URI with the same method that was used in the prior request. This has the same semantics as the `302 Found` response code, with the exception that the user agent must not change the HTTP method used: if a [`POST`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Methods/POST) was used in the first request, a `POST` must be used in the redirected request. [`308 Permanent Redirect`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/308) This means that the resource is now permanently located at another URI, specified by the [`Location`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Location) response header. This has the same semantics as the `301 Moved Permanently` HTTP response code, with the exception that the user agent must not change the HTTP method used: if a [`POST`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Methods/POST) was used in the first request, a `POST` must be used in the second request. ## [Client error responses](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status#client_error_responses) [`400 Bad Request`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/400) The server cannot or will not process the request due to something that is perceived to be a client error (e.g., malformed request syntax, invalid request message framing, or deceptive request routing). [`401 Unauthorized`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/401) Although the HTTP standard specifies "unauthorized", semantically this response means "unauthenticated". That is, the client must authenticate itself to get the requested response. [`402 Payment Required`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/402) The initial purpose of this code was for digital payment systems, however this status code is rarely used and no standard convention exists. [`403 Forbidden`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/403) The client does not have access rights to the content; that is, it is unauthorized, so the server is refusing to give the requested resource. Unlike `401 Unauthorized`, the client's identity is known to the server. [`404 Not Found`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/404) The server cannot find the requested resource. In the browser, this means the URL is not recognized. In an API, this can also mean that the endpoint is valid but the resource itself does not exist. Servers may also send this response instead of `403 Forbidden` to hide the existence of a resource from an unauthorized client. This response code is probably the most well known due to its frequent occurrence on the web. [`405 Method Not Allowed`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/405) The [request method](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Methods) is known by the server but is not supported by the target resource. For example, an API may not allow `DELETE` on a resource, or the `TRACE` method entirely. [`406 Not Acceptable`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/406) This response is sent when the web server, after performing [server-driven content negotiation](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/Content_negotiation#server-driven_content_negotiation), doesn't find any content that conforms to the criteria given by the user agent. [`407 Proxy Authentication Required`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/407) This is similar to `401 Unauthorized` but authentication is needed to be done by a proxy. [`408 Request Timeout`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/408) This response is sent on an idle connection by some servers, even without any previous request by the client. It means that the server would like to shut down this unused connection. This response is used much more since some browsers use HTTP pre-connection mechanisms to speed up browsing. Some servers may shut down a connection without sending this message. [`409 Conflict`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/409) This response is sent when a request conflicts with the current state of the server. In [WebDAV](https://developer.mozilla.org/en-US/docs/Glossary/WebDAV) remote web authoring, `409` responses are errors sent to the client so that a user might be able to resolve a conflict and resubmit the request. [`410 Gone`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/410) This response is sent when the requested content has been permanently deleted from server, with no forwarding address. Clients are expected to remove their caches and links to the resource. The HTTP specification intends this status code to be used for "limited-time, promotional services". APIs should not feel compelled to indicate resources that have been deleted with this status code. [`411 Length Required`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/411) Server rejected the request because the [`Content-Length`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Length) header field is not defined and the server requires it. [`412 Precondition Failed`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/412) In [conditional requests](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/Conditional_requests), the client has indicated preconditions in its headers which the server does not meet. [`413 Content Too Large`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/413) The request body is larger than limits defined by server. The server might close the connection or return a [`Retry-After`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Retry-After) header field. [`414 URI Too Long`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/414) The URI requested by the client is longer than the server is willing to interpret. [`415 Unsupported Media Type`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/415) The media format of the requested data is not supported by the server, so the server is rejecting the request. [`416 Range Not Satisfiable`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/416) The [ranges](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/Range_requests) specified by the `Range` header field in the request cannot be fulfilled. It's possible that the range is outside the size of the target resource's data. [`417 Expectation Failed`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/417) This response code means the expectation indicated by the [`Expect`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Expect) request header field cannot be met by the server. [`418 I'm a teapot`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/418) The server refuses the attempt to brew coffee with a teapot. [`421 Misdirected Request`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/421) The request was directed at a server that is not able to produce a response. This can be sent by a server that is not configured to produce responses for the combination of scheme and authority that are included in the request URI. [`422 Unprocessable Content`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/422) ([WebDAV](https://developer.mozilla.org/en-US/docs/Glossary/WebDAV)) The request was well-formed but was unable to be followed due to semantic errors. [`423 Locked`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/423) ([WebDAV](https://developer.mozilla.org/en-US/docs/Glossary/WebDAV)) The resource that is being accessed is locked. [`424 Failed Dependency`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/424) ([WebDAV](https://developer.mozilla.org/en-US/docs/Glossary/WebDAV)) The request failed due to failure of a previous request. [`425 Too Early`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/425) Experimental Indicates that the server is unwilling to risk processing a request that might be replayed. [`426 Upgrade Required`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/426) The server refuses to perform the request using the current protocol but might be willing to do so after the client upgrades to a different protocol. The server sends an [`Upgrade`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Upgrade) header in a 426 response to indicate the required protocol(s). [`428 Precondition Required`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/428) The origin server requires the request to be [conditional](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/Conditional_requests). This response is intended to prevent the 'lost update' problem, where a client [`GET`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Methods/GET)s a resource's state, modifies it and [`PUT`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Methods/PUT)s it back to the server, when meanwhile a third party has modified the state on the server, leading to a conflict. [`429 Too Many Requests`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/429) The user has sent too many requests in a given amount of time ([rate limiting](https://developer.mozilla.org/en-US/docs/Glossary/Rate_limit)). [`431 Request Header Fields Too Large`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/431) The server is unwilling to process the request because its header fields are too large. The request may be resubmitted after reducing the size of the request header fields. [`451 Unavailable For Legal Reasons`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/451) The user agent requested a resource that cannot legally be provided, such as a web page censored by a government. ## [Server error responses](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status#server_error_responses) [`500 Internal Server Error`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/500) The server has encountered a situation it does not know how to handle. This error is generic, indicating that the server cannot find a more appropriate `5XX` status code to respond with. [`501 Not Implemented`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/501) The request method is not supported by the server and cannot be handled. The only methods that servers are required to support (and therefore must not return this code) are [`GET`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Methods/GET) and [`HEAD`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Methods/HEAD). [`502 Bad Gateway`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/502) This error response means that the server, while working as a gateway to get a response needed to handle the request, got an invalid response. [`503 Service Unavailable`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/503) The server is not ready to handle the request. Common causes are a server that is down for maintenance or that is overloaded. Note that together with this response, a user-friendly page explaining the problem should be sent. This response should be used for temporary conditions and the [`Retry-After`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Retry-After) HTTP header should, if possible, contain the estimated time before the recovery of the service. The webmaster must also take care about the caching-related headers that are sent along with this response, as these temporary condition responses should usually not be cached. [`504 Gateway Timeout`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/504) This error response is given when the server is acting as a gateway and cannot get a response in time. [`505 HTTP Version Not Supported`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/505) The HTTP version used in the request is not supported by the server. [`506 Variant Also Negotiates`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/506) The server has an internal configuration error: during content negotiation, the chosen variant is configured to engage in content negotiation itself, which results in circular references when creating responses. [`507 Insufficient Storage`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/507) ([WebDAV](https://developer.mozilla.org/en-US/docs/Glossary/WebDAV)) The method could not be performed on the resource because the server is unable to store the representation needed to successfully complete the request. [`508 Loop Detected`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/508) ([WebDAV](https://developer.mozilla.org/en-US/docs/Glossary/WebDAV)) The server detected an infinite loop while processing the request. [`510 Not Extended`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/510) The client request declares an HTTP Extension ([RFC 2774](https://datatracker.ietf.org/doc/html/rfc2774)) that should be used to process the request, but the extension is not supported. [`511 Network Authentication Required`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/511) Indicates that the client needs to authenticate to gain network access. ## [Browser compatibility](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status#browser_compatibility) ## [See also](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status#see_also) - [List of HTTP status codes on Wikipedia](https://en.wikipedia.org/wiki/List_of_HTTP_status_codes) - [IANA official registry of HTTP status codes](https://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml) ## Help improve MDN [Learn how to contribute](https://developer.mozilla.org/en-US/docs/MDN/Community/Getting_started) This page was last modified on Jan 5, 2026 by [MDN contributors](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/contributors.txt). [View this page on GitHub](https://github.com/mdn/content/blob/main/files/en-us/web/http/reference/status/index.md?plain=1 "Folder: en-us/web/http/reference/status (Opens in a new tab)") • [Report a problem with this content](https://github.com/mdn/content/issues/new?template=page-report.yml&mdn-url=https%3A%2F%2Fdeveloper.mozilla.org%2Fen-US%2Fdocs%2FWeb%2FHTTP%2FReference%2FStatus&metadata=%3C%21--+Do+not+make+changes+below+this+line+--%3E%0A%3Cdetails%3E%0A%3Csummary%3EPage+report+details%3C%2Fsummary%3E%0A%0A+Folder%3A+%60en-us%2Fweb%2Fhttp%2Freference%2Fstatus%60%0A+MDN+URL%3A+https%3A%2F%2Fdeveloper.mozilla.org%2Fen-US%2Fdocs%2FWeb%2FHTTP%2FReference%2FStatus%0A+GitHub+URL%3A+https%3A%2F%2Fgithub.com%2Fmdn%2Fcontent%2Fblob%2Fmain%2Ffiles%2Fen-us%2Fweb%2Fhttp%2Freference%2Fstatus%2Findex.md%0A+Last+commit%3A+https%3A%2F%2Fgithub.com%2Fmdn%2Fcontent%2Fcommit%2Fcd8ed9bfa89d5ced4fd6c2083d7d90bcda41e441%0A+Document+last+modified%3A+2026-01-05T21%3A08%3A23.000Z%0A%0A%3C%2Fdetails%3E "This will take you to GitHub to file a new issue.") 1. [HTTP](https://developer.mozilla.org/en-US/docs/Web/HTTP) 2. [Guides](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides) 3. [Overview of HTTP](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/Overview) 4. [Evolution of HTTP](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/Evolution_of_HTTP) 5. [A typical HTTP session](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/Session) 6. [HTTP messages](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/Messages) 7. [Media types](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/MIME_types) 1. [Common types](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/MIME_types/Common_types) 8. [Compression in HTTP](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/Compression) 9. [HTTP caching](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/Caching) 10. [HTTP authentication](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/Authentication) 11. [Using HTTP cookies](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/Cookies) 12. [Redirections in HTTP](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/Redirections) 13. [Conditional requests](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/Conditional_requests) 14. [Range requests](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/Range_requests) 15. [Client hints](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/Client_hints) 16. [User-Agent reduction](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/User-agent_reduction) 17. [Compression Dictionary Transport](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/Compression_dictionary_transport) Experimental 18. [Network Error Logging](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/Network_Error_Logging) Experimental 19. [Content negotiation](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/Content_negotiation) 1. [Default Accept values](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/Content_negotiation/List_of_default_Accept_values) 20. [Browser detection using the UA string](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/Browser_detection_using_the_user_agent) 21. [Connection management in HTTP/1.x](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/Connection_management_in_HTTP_1.x) 22. [Protocol upgrade mechanism](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/Protocol_upgrade_mechanism) 23. [Proxy servers and tunneling](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/Proxy_servers_and_tunneling) 1. [Proxy Auto-Configuration (PAC) file](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/Proxy_servers_and_tunneling/Proxy_Auto-Configuration_PAC_file) 24. Security and privacy 1. [HTTP Observatory](https://developer.mozilla.org/en-US/observatory) 2. [Practical implementation guides](https://developer.mozilla.org/en-US/docs/Web/Security/Practical_implementation_guides) 3. [Permissions Policy](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/Permissions_Policy) Experimental 4. [Cross-Origin Resource Policy (CORP)](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/Cross-Origin_Resource_Policy) 5. [IFrame credentialless](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/IFrame_credentialless) Experimental 6. [Fetch metadata](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/Fetch_metadata) 7. [Cross-Origin Resource Sharing (CORS)](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/CORS) 8. [CORS errors](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/CORS/Errors) 1. [`Reason: CORS disabled`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/CORS/Errors/CORSDisabled) 2. [`Reason: CORS header 'Access-Control-Allow-Origin' does not match 'xyz'`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/CORS/Errors/CORSAllowOriginNotMatchingOrigin) 3. [`Reason: CORS header 'Access-Control-Allow-Origin' missing`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/CORS/Errors/CORSMissingAllowOrigin) 4. [`Reason: CORS header 'Origin' cannot be added`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/CORS/Errors/CORSOriginHeaderNotAdded) 5. [`Reason: CORS preflight channel did not succeed`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/CORS/Errors/CORSPreflightDidNotSucceed) 6. [`Reason: CORS request did not succeed`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/CORS/Errors/CORSDidNotSucceed) 7. [`Reason: CORS request external redirect not allowed`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/CORS/Errors/CORSExternalRedirectNotAllowed) 8. [`Reason: CORS request not HTTP`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/CORS/Errors/CORSRequestNotHttp) 9. [`Reason: Credential is not supported if the CORS header 'Access-Control-Allow-Origin' is ''`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/CORS/Errors/CORSNotSupportingCredentials) 10. [`Reason: Did not find method in CORS header 'Access-Control-Allow-Methods'`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/CORS/Errors/CORSMethodNotFound) 11. [`Reason: expected 'true' in CORS header 'Access-Control-Allow-Credentials'`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/CORS/Errors/CORSMIssingAllowCredentials) 12. [`Reason: invalid token 'xyz' in CORS header 'Access-Control-Allow-Headers'`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/CORS/Errors/CORSInvalidAllowHeader) 13. [`Reason: invalid token 'xyz' in CORS header 'Access-Control-Allow-Methods'`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/CORS/Errors/CORSInvalidAllowMethod) 14. [`Reason: missing token 'xyz' in CORS header 'Access-Control-Allow-Headers' from CORS preflight channel`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/CORS/Errors/CORSMissingAllowHeaderFromPreflight) 15. [`Reason: Multiple CORS header 'Access-Control-Allow-Origin' not allowed`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/CORS/Errors/CORSMultipleAllowOriginNotAllowed) 9. [Content Security Policy (CSP)](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/CSP) 1. [Errors and warnings](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/CSP/Errors) 25. [Reference](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference) 26. [HTTP headers](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers) 1. [`Accept`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Accept) 2. [`Accept-CH`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Accept-CH) 3. [`Accept-Encoding`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Accept-Encoding) 4. [`Accept-Language`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Accept-Language) 5. [`Accept-Patch`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Accept-Patch) 6. [`Accept-Post`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Accept-Post) 7. [`Accept-Ranges`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Accept-Ranges) 8. [`Access-Control-Allow-Credentials`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Access-Control-Allow-Credentials) 9. [`Access-Control-Allow-Headers`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Access-Control-Allow-Headers) 10. [`Access-Control-Allow-Methods`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Access-Control-Allow-Methods) 11. [`Access-Control-Allow-Origin`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Access-Control-Allow-Origin) 12. [`Access-Control-Expose-Headers`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Access-Control-Expose-Headers) 13. [`Access-Control-Max-Age`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Access-Control-Max-Age) 14. [`Access-Control-Request-Headers`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Access-Control-Request-Headers) 15. [`Access-Control-Request-Method`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Access-Control-Request-Method) 16. [`Activate-Storage-Access`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Activate-Storage-Access) 17. [`Age`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Age) 18. [`Allow`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Allow) 19. [`Alt-Svc`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Alt-Svc) 20. [`Alt-Used`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Alt-Used) 21. [`Attribution-Reporting-Eligible`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Attribution-Reporting-Eligible) Deprecated 22. [`Attribution-Reporting-Register-Source`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Attribution-Reporting-Register-Source) Deprecated 23. [`Attribution-Reporting-Register-Trigger`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Attribution-Reporting-Register-Trigger) Deprecated 24. [`Authorization`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Authorization) 25. [`Available-Dictionary`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Available-Dictionary) Experimental 26. [`Cache-Control`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Cache-Control) 27. [`Clear-Site-Data`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Clear-Site-Data) 28. [`Connection`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Connection) 29. [`Content-Digest`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Digest) 30. [`Content-Disposition`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Disposition) 31. [`Content-DPR`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-DPR) Non-standard Deprecated 32. [`Content-Encoding`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Encoding) 33. [`Content-Language`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Language) 34. [`Content-Length`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Length) 35. [`Content-Location`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Location) 36. [`Content-Range`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Range) 37. [`Content-Security-Policy`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Security-Policy) 38. [`Content-Security-Policy-Report-Only`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Security-Policy-Report-Only) 39. [`Content-Type`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Type) 40. [`Cookie`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Cookie) 41. [`Critical-CH`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Critical-CH) Experimental 42. [`Cross-Origin-Embedder-Policy`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Cross-Origin-Embedder-Policy) 43. [`Cross-Origin-Embedder-Policy-Report-Only`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Cross-Origin-Embedder-Policy-Report-Only) 44. [`Cross-Origin-Opener-Policy`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Cross-Origin-Opener-Policy) 45. [`Cross-Origin-Resource-Policy`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Cross-Origin-Resource-Policy) 46. [`Date`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Date) 47. [`Device-Memory`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Device-Memory) Non-standard Deprecated 48. [`Dictionary-ID`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Dictionary-ID) Experimental 49. [`DNT`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/DNT) Non-standard Deprecated 50. [`Downlink`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Downlink) Experimental 51. [`DPR`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/DPR) Non-standard Deprecated 52. [`Early-Data`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Early-Data) Experimental 53. [`ECT`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/ECT) Experimental 54. [`ETag`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/ETag) 55. [`Expect`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Expect) 56. [`Expect-CT`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Expect-CT) Deprecated 57. [`Expires`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Expires) 58. [`Forwarded`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Forwarded) 59. [`From`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/From) 60. [`Host`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Host) 61. [`Idempotency-Key`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Idempotency-Key) Experimental 62. [`If-Match`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/If-Match) 63. [`If-Modified-Since`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/If-Modified-Since) 64. [`If-None-Match`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/If-None-Match) 65. [`If-Range`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/If-Range) 66. [`If-Unmodified-Since`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/If-Unmodified-Since) 67. [`Integrity-Policy`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Integrity-Policy) 68. [`Integrity-Policy-Report-Only`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Integrity-Policy-Report-Only) 69. [`Keep-Alive`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Keep-Alive) 70. [`Last-Modified`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Last-Modified) 71. [`Link`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Link) 72. [`Location`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Location) 73. [`Max-Forwards`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Max-Forwards) 74. [`NEL`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/NEL) Experimental 75. [`No-Vary-Search`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/No-Vary-Search) Experimental 76. [`Observe-Browsing-Topics`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Observe-Browsing-Topics) Non-standard Deprecated 77. [`Origin`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Origin) 78. [`Origin-Agent-Cluster`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Origin-Agent-Cluster) 79. [`Permissions-Policy`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy) Experimental 80. [`Pragma`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Pragma) Deprecated 81. [`Prefer`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Prefer) 82. [`Preference-Applied`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Preference-Applied) 83. [`Priority`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Priority) 84. [`Proxy-Authenticate`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Proxy-Authenticate) 85. [`Proxy-Authorization`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Proxy-Authorization) 86. [`Range`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Range) 87. [`Referer`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Referer) 88. [`Referrer-Policy`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Referrer-Policy) 89. [`Refresh`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Refresh) 90. [`Report-To`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Report-To) Non-standard Deprecated 91. [`Reporting-Endpoints`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Reporting-Endpoints) 92. [`Repr-Digest`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Repr-Digest) 93. [`Retry-After`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Retry-After) 94. [`RTT`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/RTT) Experimental 95. [`Save-Data`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Save-Data) Experimental 96. [`Sec-Browsing-Topics`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Sec-Browsing-Topics) Non-standard Deprecated 97. [`Sec-CH-Device-Memory`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Sec-CH-Device-Memory) Experimental 98. [`Sec-CH-DPR`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Sec-CH-DPR) Experimental 99. [`Sec-CH-Prefers-Color-Scheme`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Sec-CH-Prefers-Color-Scheme) Experimental 100. [`Sec-CH-Prefers-Reduced-Motion`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Sec-CH-Prefers-Reduced-Motion) Experimental 101. [`Sec-CH-Prefers-Reduced-Transparency`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Sec-CH-Prefers-Reduced-Transparency) Experimental 102. [`Sec-CH-UA`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Sec-CH-UA) Experimental 103. [`Sec-CH-UA-Arch`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Sec-CH-UA-Arch) Experimental 104. [`Sec-CH-UA-Bitness`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Sec-CH-UA-Bitness) Experimental 105. [`Sec-CH-UA-Form-Factors`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Sec-CH-UA-Form-Factors) Experimental 106. [`Sec-CH-UA-Full-Version`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Sec-CH-UA-Full-Version) Deprecated 107. [`Sec-CH-UA-Full-Version-List`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Sec-CH-UA-Full-Version-List) Experimental 108. [`Sec-CH-UA-Mobile`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Sec-CH-UA-Mobile) Experimental 109. [`Sec-CH-UA-Model`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Sec-CH-UA-Model) Experimental 110. [`Sec-CH-UA-Platform`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Sec-CH-UA-Platform) Experimental 111. [`Sec-CH-UA-Platform-Version`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Sec-CH-UA-Platform-Version) Experimental 112. [`Sec-CH-UA-WoW64`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Sec-CH-UA-WoW64) Experimental 113. [`Sec-CH-Viewport-Height`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Sec-CH-Viewport-Height) Experimental 114. [`Sec-CH-Viewport-Width`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Sec-CH-Viewport-Width) Experimental 115. [`Sec-CH-Width`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Sec-CH-Width) Experimental 116. [`Sec-Fetch-Dest`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Sec-Fetch-Dest) 117. [`Sec-Fetch-Mode`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Sec-Fetch-Mode) 118. [`Sec-Fetch-Site`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Sec-Fetch-Site) 119. [`Sec-Fetch-Storage-Access`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Sec-Fetch-Storage-Access) 120. [`Sec-Fetch-User`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Sec-Fetch-User) 121. [`Sec-GPC`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Sec-GPC) Experimental 122. [`Sec-Private-State-Token`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Sec-Private-State-Token) Experimental 123. [`Sec-Private-State-Token-Crypto-Version`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Sec-Private-State-Token-Crypto-Version) Experimental 124. [`Sec-Private-State-Token-Lifetime`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Sec-Private-State-Token-Lifetime) Experimental 125. [`Sec-Purpose`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Sec-Purpose) 126. [`Sec-Redemption-Record`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Sec-Redemption-Record) Experimental 127. [`Sec-Speculation-Tags`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Sec-Speculation-Tags) Experimental 128. [`Sec-WebSocket-Accept`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Sec-WebSocket-Accept) 129. [`Sec-WebSocket-Extensions`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Sec-WebSocket-Extensions) 130. [`Sec-WebSocket-Key`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Sec-WebSocket-Key) 131. [`Sec-WebSocket-Protocol`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Sec-WebSocket-Protocol) 132. [`Sec-WebSocket-Version`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Sec-WebSocket-Version) 133. [`Server`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Server) 134. [`Server-Timing`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Server-Timing) 135. [`Service-Worker`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Service-Worker) 136. [`Service-Worker-Allowed`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Service-Worker-Allowed) 137. [`Service-Worker-Navigation-Preload`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Service-Worker-Navigation-Preload) 138. [`Set-Cookie`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Set-Cookie) 139. [`Set-Login`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Set-Login) 140. [`SourceMap`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/SourceMap) 141. [`Speculation-Rules`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Speculation-Rules) Experimental 142. [`Strict-Transport-Security`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Strict-Transport-Security) 143. [`Supports-Loading-Mode`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Supports-Loading-Mode) Experimental 144. [`TE`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/TE) 145. [`Timing-Allow-Origin`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Timing-Allow-Origin) 146. [`Tk`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Tk) Non-standard Deprecated 147. [`Trailer`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Trailer) 148. [`Transfer-Encoding`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Transfer-Encoding) 149. [`Upgrade`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Upgrade) 150. [`Upgrade-Insecure-Requests`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Upgrade-Insecure-Requests) 151. [`Use-As-Dictionary`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Use-As-Dictionary) Experimental 152. [`User-Agent`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/User-Agent) 153. [`Vary`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Vary) 154. [`Via`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Via) 155. [`Viewport-Width`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Viewport-Width) Non-standard Deprecated 156. [`Want-Content-Digest`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Want-Content-Digest) 157. [`Want-Repr-Digest`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Want-Repr-Digest) 158. [`Warning`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Warning) Deprecated 159. [`Width`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Width) Non-standard Deprecated 160. [`WWW-Authenticate`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/WWW-Authenticate) 161. [`X-Content-Type-Options`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/X-Content-Type-Options) 162. [`X-DNS-Prefetch-Control`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/X-DNS-Prefetch-Control) Non-standard 163. [`X-Forwarded-For`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/X-Forwarded-For) Non-standard 164. [`X-Forwarded-Host`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/X-Forwarded-Host) Non-standard 165. [`X-Forwarded-Proto`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/X-Forwarded-Proto) Non-standard 166. [`X-Frame-Options`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/X-Frame-Options) 167. [`X-Permitted-Cross-Domain-Policies`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/X-Permitted-Cross-Domain-Policies) Non-standard 168. [`X-Powered-By`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/X-Powered-By) Non-standard 169. [`X-Robots-Tag`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/X-Robots-Tag) Non-standard 170. [`X-XSS-Protection`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/X-XSS-Protection) Non-standard Deprecated 27. [HTTP request methods](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Methods) 1. [`CONNECT`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Methods/CONNECT) 2. [`DELETE`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Methods/DELETE) 3. [`GET`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Methods/GET) 4. [`HEAD`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Methods/HEAD) 5. [`OPTIONS`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Methods/OPTIONS) 6. [`PATCH`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Methods/PATCH) 7. [`POST`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Methods/POST) 8. [`PUT`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Methods/PUT) 9. [`TRACE`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Methods/TRACE) 28. [HTTP response status codes](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status) 1. [`100 Continue`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/100) 2. [`101 Switching Protocols`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/101) 3. [`102 Processing`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/102) 4. [`103 Early Hints`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/103) 5. [`200 OK`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/200) 6. [`201 Created`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/201) 7. [`202 Accepted`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/202) 8. [`203 Non-Authoritative Information`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/203) 9. [`204 No Content`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/204) 10. [`205 Reset Content`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/205) 11. [`206 Partial Content`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/206) 12. [`207 Multi-Status`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/207) 13. [`208 Already Reported`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/208) 14. [`226 IM Used`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/226) 15. [`300 Multiple Choices`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/300) 16. [`301 Moved Permanently`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/301) 17. [`302 Found`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/302) 18. [`303 See Other`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/303) 19. [`304 Not Modified`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/304) 20. [`307 Temporary Redirect`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/307) 21. [`308 Permanent Redirect`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/308) 22. [`400 Bad Request`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/400) 23. [`401 Unauthorized`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/401) 24. [`402 Payment Required`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/402) 25. [`403 Forbidden`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/403) 26. [`404 Not Found`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/404) 27. [`405 Method Not Allowed`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/405) 28. [`406 Not Acceptable`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/406) 29. [`407 Proxy Authentication Required`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/407) 30. [`408 Request Timeout`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/408) 31. [`409 Conflict`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/409) 32. [`410 Gone`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/410) 33. [`411 Length Required`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/411) 34. [`412 Precondition Failed`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/412) 35. [`413 Content Too Large`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/413) 36. [`414 URI Too Long`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/414) 37. [`415 Unsupported Media Type`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/415) 38. [`416 Range Not Satisfiable`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/416) 39. [`417 Expectation Failed`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/417) 40. [`418 I'm a teapot`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/418) 41. [`421 Misdirected Request`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/421) 42. [`422 Unprocessable Content`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/422) 43. [`423 Locked`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/423) 44. [`424 Failed Dependency`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/424) 45. [`425 Too Early`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/425) 46. [`426 Upgrade Required`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/426) 47. [`428 Precondition Required`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/428) 48. [`429 Too Many Requests`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/429) 49. [`431 Request Header Fields Too Large`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/431) 50. [`451 Unavailable For Legal Reasons`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/451) 51. [`500 Internal Server Error`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/500) 52. [`501 Not Implemented`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/501) 53. [`502 Bad Gateway`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/502) 54. [`503 Service Unavailable`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/503) 55. [`504 Gateway Timeout`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/504) 56. [`505 HTTP Version Not Supported`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/505) 57. [`506 Variant Also Negotiates`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/506) 58. [`507 Insufficient Storage`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/507) 59. [`508 Loop Detected`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/508) 60. [`510 Not Extended`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/510) 61. [`511 Network Authentication Required`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/511) 29. [CSP directives](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Security-Policy#directives) 1. [`base-uri`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Security-Policy/base-uri) 2. [`block-all-mixed-content`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Security-Policy/block-all-mixed-content) Deprecated 3. [`child-src`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Security-Policy/child-src) 4. [`connect-src`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Security-Policy/connect-src) 5. [`default-src`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Security-Policy/default-src) 6. [`fenced-frame-src`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Security-Policy/fenced-frame-src) Experimental 7. [`font-src`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Security-Policy/font-src) 8. [`form-action`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Security-Policy/form-action) 9. [`frame-ancestors`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Security-Policy/frame-ancestors) 10. [`frame-src`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Security-Policy/frame-src) 11. [`img-src`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Security-Policy/img-src) 12. [`manifest-src`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Security-Policy/manifest-src) 13. [`media-src`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Security-Policy/media-src) 14. [`object-src`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Security-Policy/object-src) 15. [`prefetch-src`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Security-Policy/prefetch-src) Non-standard Deprecated 16. [`report-to`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Security-Policy/report-to) 17. [`report-uri`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Security-Policy/report-uri) Deprecated 18. [`require-trusted-types-for`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Security-Policy/require-trusted-types-for) 19. [`sandbox`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Security-Policy/sandbox) 20. [`script-src`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Security-Policy/script-src) 21. [`script-src-attr`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Security-Policy/script-src-attr) 22. [`script-src-elem`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Security-Policy/script-src-elem) 23. [`style-src`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Security-Policy/style-src) 24. [`style-src-attr`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Security-Policy/style-src-attr) 25. [`style-src-elem`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Security-Policy/style-src-elem) 26. [`trusted-types`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Security-Policy/trusted-types) 27. [`upgrade-insecure-requests`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Security-Policy/upgrade-insecure-requests) 28. [`worker-src`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Security-Policy/worker-src) 30. [Permissions-Policy directives](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy#directives) Experimental 1. [`accelerometer`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy/accelerometer) Experimental 2. [`ambient-light-sensor`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy/ambient-light-sensor) Experimental 3. [`aria-notify`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy/aria-notify) Experimental 4. [`attribution-reporting`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy/attribution-reporting) Deprecated 5. [`autoplay`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy/autoplay) Experimental 6. [`bluetooth`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy/bluetooth) Experimental 7. [`browsing-topics`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy/browsing-topics) Non-standard Deprecated 8. [`camera`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy/camera) Experimental 9. [`captured-surface-control`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy/captured-surface-control) Experimental 10. [`ch-ua-high-entropy-values`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy/ch-ua-high-entropy-values) Experimental 11. [`compute-pressure`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy/compute-pressure) Experimental 12. [`cross-origin-isolated`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy/cross-origin-isolated) Experimental 13. [`deferred-fetch`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy/deferred-fetch) Experimental 14. [`deferred-fetch-minimal`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy/deferred-fetch-minimal) Experimental 15. [`display-capture`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy/display-capture) Experimental 16. [`encrypted-media`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy/encrypted-media) Experimental 17. [`fullscreen`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy/fullscreen) Experimental 18. [`gamepad`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy/gamepad) Experimental 19. [`geolocation`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy/geolocation) Experimental 20. [`gyroscope`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy/gyroscope) Experimental 21. [`hid`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy/hid) Experimental 22. [`identity-credentials-get`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy/identity-credentials-get) Experimental 23. [`idle-detection`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy/idle-detection) Experimental 24. [`language-detector`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy/language-detector) Experimental 25. [`local-fonts`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy/local-fonts) Experimental 26. [`magnetometer`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy/magnetometer) Experimental 27. [`microphone`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy/microphone) Experimental 28. [`midi`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy/midi) Experimental 29. [`on-device-speech-recognition`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy/on-device-speech-recognition) Experimental 30. [`otp-credentials`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy/otp-credentials) Experimental 31. [`payment`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy/payment) Experimental 32. [`picture-in-picture`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy/picture-in-picture) Experimental 33. [`private-state-token-issuance`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy/private-state-token-issuance) Experimental 34. [`private-state-token-redemption`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy/private-state-token-redemption) Experimental 35. [`publickey-credentials-create`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy/publickey-credentials-create) Experimental 36. [`publickey-credentials-get`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy/publickey-credentials-get) Experimental 37. [`screen-wake-lock`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy/screen-wake-lock) Experimental 38. [`serial`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy/serial) Experimental 39. [`speaker-selection`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy/speaker-selection) Experimental 40. [`storage-access`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy/storage-access) Experimental 41. [`summarizer`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy/summarizer) Experimental 42. [`translator`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy/translator) Experimental 43. [`usb`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy/usb) Experimental 44. [`web-share`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy/web-share) Experimental 45. [`window-management`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy/window-management) Experimental 46. [`xr-spatial-tracking`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Permissions-Policy/xr-spatial-tracking) Experimental 31. [HTTP resources and specifications](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Resources_and_specifications) Your blueprint for a better internet. 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Portions of this content are ©1998–2026 by individual mozilla.org contributors. Content available under [a Creative Commons license](https://developer.mozilla.org/docs/MDN/Writing_guidelines/Attrib_copyright_license).
Readable Markdown	## [Informational responses](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status#informational_responses) [`100 Continue`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/100) This interim response indicates that the client should continue the request or ignore the response if the request is already finished. [`101 Switching Protocols`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/101) This code is sent in response to an [`Upgrade`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Upgrade) request header from the client and indicates the protocol the server is switching to. [`102 Processing`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/102) Deprecated This code was used in [WebDAV](https://developer.mozilla.org/en-US/docs/Glossary/WebDAV) contexts to indicate that a request has been received by the server, but no status was available at the time of the response. [`103 Early Hints`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/103) This status code is primarily intended to be used with the [`Link`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Link) header, letting the user agent start [preloading](https://developer.mozilla.org/en-US/docs/Web/HTML/Reference/Attributes/rel/preload) resources while the server prepares a response or [preconnect](https://developer.mozilla.org/en-US/docs/Web/HTML/Reference/Attributes/rel/preconnect) to an origin from which the page will need resources. ## [Successful responses](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status#successful_responses) [`200 OK`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/200) The request succeeded. The result and meaning of "success" depends on the HTTP method: - [`GET`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Methods/GET): The resource has been fetched and transmitted in the message body. - [`HEAD`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Methods/HEAD): Representation headers are included in the response without any message body. - [`PUT`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Methods/PUT) or [`POST`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Methods/POST): The resource describing the result of the action is transmitted in the message body. - [`TRACE`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Methods/TRACE): The message body contains the request as received by the server. [`201 Created`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/201) The request succeeded, and a new resource was created as a result. This is typically the response sent after [`POST`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Methods/POST) requests, or some [`PUT`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Methods/PUT) requests. [`202 Accepted`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/202) The request has been received but not yet acted upon. It is noncommittal, since there is no way in HTTP to later send an asynchronous response indicating the outcome of the request. It is intended for cases where another process or server handles the request, or for batch processing. This response code means the returned metadata is not exactly the same as is available from the origin server, but is collected from a local or a third-party copy. This is mostly used for mirrors or backups of another resource. Except for that specific case, the [`200 OK`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/200) response is preferred to this status. [`204 No Content`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/204) There is no content to send for this request, but the headers are useful. The user agent may update its cached headers for this resource with the new ones. [`205 Reset Content`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/205) Tells the user agent to reset the document which sent this request. [`206 Partial Content`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/206) This response code is used in response to a [range request](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/Range_requests) when the client has requested a part or parts of a resource. [`207 Multi-Status`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/207) ([WebDAV](https://developer.mozilla.org/en-US/docs/Glossary/WebDAV)) Conveys information about multiple resources, for situations where multiple status codes might be appropriate. [`208 Already Reported`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/208) ([WebDAV](https://developer.mozilla.org/en-US/docs/Glossary/WebDAV)) Used inside a `<dav:propstat>` response element to avoid repeatedly enumerating the internal members of multiple bindings to the same collection. [`226 IM Used`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/226) ([HTTP Delta encoding](https://datatracker.ietf.org/doc/html/rfc3229)) The server has fulfilled a [`GET`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Methods/GET) request for the resource, and the response is a representation of the result of one or more instance-manipulations applied to the current instance. ## [Redirection messages](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status#redirection_messages) [`300 Multiple Choices`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/300) In [agent-driven content negotiation](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/Content_negotiation#agent-driven_negotiation), the request has more than one possible response and the user agent or user should choose one of them. There is no standardized way for clients to automatically choose one of the responses, so this is rarely used. [`301 Moved Permanently`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/301) The URL of the requested resource has been changed permanently. The new URL is given in the response. [`302 Found`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/302) This response code means that the URI of requested resource has been changed temporarily. Further changes in the URI might be made in the future, so the same URI should be used by the client in future requests. [`303 See Other`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/303) The server sent this response to direct the client to get the requested resource at another URI with a [`GET`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Methods/GET) request. [`304 Not Modified`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/304) This is used for caching purposes. It tells the client that the response has not been modified, so the client can continue to use the same [cached](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/Caching) version of the response. [`305 Use Proxy` Deprecated](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status#305_use_proxy) Defined in a previous version of the HTTP specification to indicate that a requested response must be accessed by a proxy. It has been deprecated due to security concerns regarding in-band configuration of a proxy. [`306 unused`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status#306_unused) This response code is no longer used; but is reserved. It was used in a previous version of the HTTP/1.1 specification. [`307 Temporary Redirect`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/307) The server sends this response to direct the client to get the requested resource at another URI with the same method that was used in the prior request. This has the same semantics as the `302 Found` response code, with the exception that the user agent must not change the HTTP method used: if a [`POST`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Methods/POST) was used in the first request, a `POST` must be used in the redirected request. [`308 Permanent Redirect`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/308) This means that the resource is now permanently located at another URI, specified by the [`Location`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Location) response header. This has the same semantics as the `301 Moved Permanently` HTTP response code, with the exception that the user agent must not change the HTTP method used: if a [`POST`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Methods/POST) was used in the first request, a `POST` must be used in the second request. ## [Client error responses](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status#client_error_responses) [`400 Bad Request`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/400) The server cannot or will not process the request due to something that is perceived to be a client error (e.g., malformed request syntax, invalid request message framing, or deceptive request routing). [`401 Unauthorized`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/401) Although the HTTP standard specifies "unauthorized", semantically this response means "unauthenticated". That is, the client must authenticate itself to get the requested response. [`402 Payment Required`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/402) The initial purpose of this code was for digital payment systems, however this status code is rarely used and no standard convention exists. [`403 Forbidden`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/403) The client does not have access rights to the content; that is, it is unauthorized, so the server is refusing to give the requested resource. Unlike `401 Unauthorized`, the client's identity is known to the server. [`404 Not Found`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/404) The server cannot find the requested resource. In the browser, this means the URL is not recognized. In an API, this can also mean that the endpoint is valid but the resource itself does not exist. Servers may also send this response instead of `403 Forbidden` to hide the existence of a resource from an unauthorized client. This response code is probably the most well known due to its frequent occurrence on the web. [`405 Method Not Allowed`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/405) The [request method](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Methods) is known by the server but is not supported by the target resource. For example, an API may not allow `DELETE` on a resource, or the `TRACE` method entirely. [`406 Not Acceptable`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/406) This response is sent when the web server, after performing [server-driven content negotiation](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/Content_negotiation#server-driven_content_negotiation), doesn't find any content that conforms to the criteria given by the user agent. [`407 Proxy Authentication Required`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/407) This is similar to `401 Unauthorized` but authentication is needed to be done by a proxy. [`408 Request Timeout`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/408) This response is sent on an idle connection by some servers, even without any previous request by the client. It means that the server would like to shut down this unused connection. This response is used much more since some browsers use HTTP pre-connection mechanisms to speed up browsing. Some servers may shut down a connection without sending this message. [`409 Conflict`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/409) This response is sent when a request conflicts with the current state of the server. In [WebDAV](https://developer.mozilla.org/en-US/docs/Glossary/WebDAV) remote web authoring, `409` responses are errors sent to the client so that a user might be able to resolve a conflict and resubmit the request. [`410 Gone`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/410) This response is sent when the requested content has been permanently deleted from server, with no forwarding address. Clients are expected to remove their caches and links to the resource. The HTTP specification intends this status code to be used for "limited-time, promotional services". APIs should not feel compelled to indicate resources that have been deleted with this status code. [`411 Length Required`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/411) Server rejected the request because the [`Content-Length`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Length) header field is not defined and the server requires it. [`412 Precondition Failed`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/412) In [conditional requests](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/Conditional_requests), the client has indicated preconditions in its headers which the server does not meet. [`413 Content Too Large`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/413) The request body is larger than limits defined by server. The server might close the connection or return a [`Retry-After`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Retry-After) header field. [`414 URI Too Long`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/414) The URI requested by the client is longer than the server is willing to interpret. [`415 Unsupported Media Type`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/415) The media format of the requested data is not supported by the server, so the server is rejecting the request. [`416 Range Not Satisfiable`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/416) The [ranges](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/Range_requests) specified by the `Range` header field in the request cannot be fulfilled. It's possible that the range is outside the size of the target resource's data. [`417 Expectation Failed`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/417) This response code means the expectation indicated by the [`Expect`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Expect) request header field cannot be met by the server. [`418 I'm a teapot`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/418) The server refuses the attempt to brew coffee with a teapot. [`421 Misdirected Request`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/421) The request was directed at a server that is not able to produce a response. This can be sent by a server that is not configured to produce responses for the combination of scheme and authority that are included in the request URI. [`422 Unprocessable Content`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/422) ([WebDAV](https://developer.mozilla.org/en-US/docs/Glossary/WebDAV)) The request was well-formed but was unable to be followed due to semantic errors. [`423 Locked`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/423) ([WebDAV](https://developer.mozilla.org/en-US/docs/Glossary/WebDAV)) The resource that is being accessed is locked. [`424 Failed Dependency`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/424) ([WebDAV](https://developer.mozilla.org/en-US/docs/Glossary/WebDAV)) The request failed due to failure of a previous request. [`425 Too Early`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/425) Experimental Indicates that the server is unwilling to risk processing a request that might be replayed. [`426 Upgrade Required`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/426) The server refuses to perform the request using the current protocol but might be willing to do so after the client upgrades to a different protocol. The server sends an [`Upgrade`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Upgrade) header in a 426 response to indicate the required protocol(s). [`428 Precondition Required`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/428) The origin server requires the request to be [conditional](https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/Conditional_requests). This response is intended to prevent the 'lost update' problem, where a client [`GET`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Methods/GET)s a resource's state, modifies it and [`PUT`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Methods/PUT)s it back to the server, when meanwhile a third party has modified the state on the server, leading to a conflict. [`429 Too Many Requests`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/429) The user has sent too many requests in a given amount of time ([rate limiting](https://developer.mozilla.org/en-US/docs/Glossary/Rate_limit)). [`431 Request Header Fields Too Large`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/431) The server is unwilling to process the request because its header fields are too large. The request may be resubmitted after reducing the size of the request header fields. [`451 Unavailable For Legal Reasons`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/451) The user agent requested a resource that cannot legally be provided, such as a web page censored by a government. ## [Server error responses](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status#server_error_responses) [`500 Internal Server Error`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/500) The server has encountered a situation it does not know how to handle. This error is generic, indicating that the server cannot find a more appropriate `5XX` status code to respond with. [`501 Not Implemented`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/501) The request method is not supported by the server and cannot be handled. The only methods that servers are required to support (and therefore must not return this code) are [`GET`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Methods/GET) and [`HEAD`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Methods/HEAD). [`502 Bad Gateway`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/502) This error response means that the server, while working as a gateway to get a response needed to handle the request, got an invalid response. [`503 Service Unavailable`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/503) The server is not ready to handle the request. Common causes are a server that is down for maintenance or that is overloaded. Note that together with this response, a user-friendly page explaining the problem should be sent. This response should be used for temporary conditions and the [`Retry-After`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Retry-After) HTTP header should, if possible, contain the estimated time before the recovery of the service. The webmaster must also take care about the caching-related headers that are sent along with this response, as these temporary condition responses should usually not be cached. [`504 Gateway Timeout`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/504) This error response is given when the server is acting as a gateway and cannot get a response in time. [`505 HTTP Version Not Supported`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/505) The HTTP version used in the request is not supported by the server. [`506 Variant Also Negotiates`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/506) The server has an internal configuration error: during content negotiation, the chosen variant is configured to engage in content negotiation itself, which results in circular references when creating responses. [`507 Insufficient Storage`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/507) ([WebDAV](https://developer.mozilla.org/en-US/docs/Glossary/WebDAV)) The method could not be performed on the resource because the server is unable to store the representation needed to successfully complete the request. [`508 Loop Detected`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/508) ([WebDAV](https://developer.mozilla.org/en-US/docs/Glossary/WebDAV)) The server detected an infinite loop while processing the request. [`510 Not Extended`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/510) The client request declares an HTTP Extension ([RFC 2774](https://datatracker.ietf.org/doc/html/rfc2774)) that should be used to process the request, but the extension is not supported. [`511 Network Authentication Required`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/511) Indicates that the client needs to authenticate to gain network access. ## [Browser compatibility](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status#browser_compatibility) ## [See also](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status#see_also) - [List of HTTP status codes on Wikipedia](https://en.wikipedia.org/wiki/List_of_HTTP_status_codes) - [IANA official registry of HTTP status codes](https://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml)
Shard	53 (laksa)
Root Hash	7082249407640205653
Unparsed URL	org,mozilla!developer,/en-US/docs/Web/HTTP/Reference/Status s443