🕷️ Crawler Inspector

URL Lookup

Direct Parameter Lookup

Raw Queries and Responses

1. Shard Calculation

Query:

Response:

Calculated Shard: 64 (from laksa059)

2. Crawled Status Check

Query:

curl -X POST \
  'http://laksa064.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://www.webfx.com/web-development/glossary/http-status-codes/\')), getAhrefsUnparsedNoserviceFromURL(\'https://www.webfx.com/web-development/glossary/http-status-codes/\'))) FORMAT JSONEachRow'

Response:

{"found_url":"https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/","crawl_time":1776059276,"first_indexed_time":1646649655,"http_code":200,"src_unparsed":"com,webfx!www,\/web-development\/glossary\/http-status-codes\/ s443","src_root_hash":"14994341350043755464","history_drop_reason":null,"meta_title":"HTTP Status Codes Glossary - WebFX","meta_descriptions":["Wondering what an HTTP status code means? Browse this list of HTTP status codes for definitions and code references."],"attrs_boilerpipe_text":"Table of Contents\n1×× Informational\n2×× Success\n3×× Redirection\n4×× Client Error\n5×× Server Error\nHTTP status codes shape how browsers, users, and search engines interact with your site. Developers use them for debugging, while marketers and SEOs rely on them to monitor crawlability, fix errors, and protect rankings.\nThis list is an easy-to-reference database of HTTP status codes with their definitions and helpful code references all in one place.\nVisit an individual status code via https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-___-status-code\/ or browse the list below.\n1×× Informational\nCode\nMeaning\nSEO \/ Use Case\n100 Continue\nRequest received, client should proceed.\nRarely used in SEO.\n101 Switching Protocols\nServer switching per request.\nNo SEO impact.\n102 Processing\nServer received the request and continues processing; no final response yet.\nUsed for long operations (WebDAV); no SEO impact.\n2×× Success\nCode\nMeaning\nSEO \/ Use Case\n200 Ok\nRequest succeeded.\nStandard response crawlers need.\n201 Created\nResource created (often POST).\nAPI\/creation success; not crawl-related.\n202 Accepted\nRequest received, processing pending.\nAsync ops; no SEO effect.\n203 Non-Authoritative Information\nResponse from transforming proxy.\nRare; no SEO value.\n204 No Content\nSuccess, no response body.\nUseful for APIs.\n205 Reset Content\nClient should reset the form.\nNot SEO-relevant.\n206 Partial Content\nServer delivered partial range.\nUsed in media\/large files; no SEO use.\n207 Multi-Status\nMultiple status codes for WebDAV.\nNot SEO-relevant.\n208 Already Reported\nWebDAV code; avoids repeats.\nNot SEO-relevant.\n226 IM Used\nServer applied delta encoding.\nRare; not SEO-related.\n3×× Redirection\nCode\nMeaning\nSEO \/ Use Case\n300 Multiple Choices\nSeveral options for resource.\nMay confuse crawlers; avoid.\n301 Moved Permanently\nResource permanently redirected.\nSEO-friendly redirect.\n302 Found\nTemporary redirect.\nAvoid long-term SEO;\nuse 301\n.\n303 See Other\nDirects client to another URI (GET).\nUsed in form submissions.\n304 Not Modified\nClient can use cached version.\nHelps reduce crawl load.\n305 Use Proxy\nMust access via proxy.\nDeprecated; ignore.\n307 Temporary Redirect\nSame as 302, but method preserved.\nFor temp moves; no long-term SEO.\n308 Permanent Redirect\nSame as 301 but method preserved.\nGood SEO alternative to 301.\n4×× Client Error\nCode\nMeaning\nSEO \/ Use Case\n400 Bad Request\nInvalid request syntax.\nCheck logs; fix malformed URLs.\n401 Unauthorized\nAuthentication required.\nMay block crawlers unintentionally.\n402 Payment Required\nReserved for future use.\nNot SEO-relevant.\n403 Forbidden\nServer refused request.\nEnsure important pages aren’t restricted\n404 Not Found\nPage not found.\nRedirect\nor customize the page. Redirects explained. \n405 Method Not Allowed\nRequest method not permitted.\nRare; check API endpoints.\n406 Not Acceptable\nResource can’t return requested format.\nRare; not SEO-focused.\n407 Proxy Authentication Required\nClient must authenticate proxy.\nNot SEO-relevant.\n408 Request Timeout\nServer timed out waiting for request.\nCould disrupt\ncrawlers\n.\n409 Conflict\nRequest conflict (e.g., edit conflicts).\nWeb apps; not SEO.\n410 Gone\nResource intentionally removed.\nTells search engines page is gone.\n411 Length Required\nMissing\nContent-Length.\nRare; not SEO.\n412 Precondition Failed\nConditions not met.\nAPI\/webdav use.\n413 Payload Too Large\nRequest entity too large.\nRare; no SEO.\n414 Request-URI Too Long\nURL exceeds max length.\nAvoid overly long URLs in SEO.\n415 Unsupported Media Type\nServer refuses type.\nNo SEO impact.\n416 Requested Range Not Satisfiable\nInvalid range header.\nNo SEO impact.\n417 Expectation Failed\nServer can’t meet Expect header.\nRare.\n418 I’m a Teapot\nJoke code (RFC 2324).\nNone.\n421 Misdirected Request\nRequest to wrong server.\nCDN issues.\n422 Unprocessable Entity\nSemantic errors in request.\nWebDAV; not SEO.\n423 Locked\nResource locked.\nWebDAV.\n424 Failed Dependency\nRequest failed due to dependency.\nWebDAV.\n426 Upgrade Required\nClient must switch protocols.\nNot SEO.\n428 Precondition Required\nServer requires conditions.\nRare.\n429 Too Many Requests\nRate-limited.\nMay block bots.\n431 Request Header Fields Too Large\nHeaders too big.\nCould block\ncrawlers\n.\n444 Connection Closed Without Response\nServer drops the connection without sending a response (nginx). Often used to terminate unwanted or suspicious requests.\nTreat as a network error. Audit WAF\/CDN rules to avoid false positives that block crawlers. Monitor error rates and server logs\n451 Unavailable for Legal Reasons\nThe server denies access to the resource due to legal demands (e.g., DMCA, government restrictions).\nMay cause content to disappear from search results; signals deliberate removal.\n499 Client Closed Request\nClient closes the connection before the server sends a response (nginx).\nInvestigate long TTFB, client timeouts, and CDN\/proxy disconnects. Crawlers log a fetch failure; reduce latency and stabilize origin performance.\n5×× Server Error\nCode\nMeaning\nSEO \/ Use Case\n500 Internal Server Error\nGeneric server error.\nFix immediately; harms SEO.\n501 Not Implemented\nServer lacks functionality.\nRare.\n502 Bad Gateway\nInvalid response from upstream.\nCheck hosting\/CDN.\n503 Service Unavailable\nServer overloaded or down.\nUse for planned downtime.\n504 Gateway Timeout\nUpstream didn’t respond.\nHosting\/CDN issues.\n505 HTTP Version Not Supported\nVersion not supported.\nRare.\n506 Variant Also Negotiates\nConfig error in content negotiation.\nRare.\n507 Insufficient Storage\nServer out of storage (WebDAV).\nNot SEO.\n508 Loop Detected\nInfinite loop in request.\nWebDAV.\n510 Not Extended\nExtensions required.\nRare.\n511 Network Authentication Required\nNetwork login required.\nNot SEO impact\n599 Network Connect Timeout Error\nNetwork timeout not covered by 504; used by HAProxy, some CDNs.\nSignals upstream instability. Monitor hosting\/CDN; prolonged use may impact crawl reliability.\nAdditional resources\nLearn about web development\nLearn about SEO\nWeb development services from WebFX\nSEO services from WebFX\nMDN Web Docs\nW3Schools\nFAQs about HTTP status codes\nLearn more about HTTP status codes with these FAQs:\nWhat are HTTP status codes?\nHTTP status codes are three-digit numbers that are returned by servers to indicate the status of a client’s request. When a client (such as a web browser) makes a request to a server, the server will respond with a status code and a message indicating whether the request was successful or not.\nWhat are the HTTP status code classes?\nThere are five classes of HTTP status codes, each identified by the first digit of the three-digit status code. The classes are as follows:\n1xx (Informational)\nThese status codes indicate that the server has received the request and is continuing to process it. They are primarily used to convey information about the status of the request while it is being processed.\n2xx (Successful)\nThese status codes indicate that the request was successfully received, understood, and accepted by the server. They are typically used to indicate that the requested action has been successfully completed.\n3xx (Redirection)\nThese status codes indicate that the client needs to take additional action to complete the request. They are typically used to redirect the client to a different resource or location.\n4xx (Client Error)\nThese status codes indicate that the server cannot process the request because the client has made an error. They are typically caused by issues such as invalid input, authentication problems, or insufficient permissions.\n5xx (Server Error)\nThese status codes indicate that the server encountered an error while processing the request. They are typically caused by issues such as server overload, programming errors, or infrastructure problems.\nWhich HTTP status codes affect SEO?\nSeveral HTTP status codes are important for SEO, including:\n200 OK\nThis is the most common status code and indicates that the server has successfully processed the request and returned the requested resource. This is the ideal status code to receive for search engine optimization purposes as it indicates that the content is available and accessible to both users and search engines.\n301 Moved Permanently\nThis status code indicates that the requested resource has been permanently moved to a new URL. This is important for SEO because it ensures that search engines can redirect users to the new URL and transfer the SEO value of the old URL to the new one.\n404 Not Found\nThis status code indicates that the requested resource is not available on the server. This can be problematic for SEO because it indicates to both users and search engines that the content is not available. It is important to fix 404 errors as soon as possible to avoid losing SEO value and providing a poor user experience.\n503 Service Unavailable\nThis status code indicates that the server is temporarily unavailable due to maintenance or overload. This can be problematic for SEO because search engines may interpret this as a sign of an unreliable website. It is important to fix 503 errors as soon as possible to avoid losing SEO value and providing a poor user experience.\nIn general, it is important to monitor and fix any HTTP status codes that could negatively impact user experience or search engine indexing.","attrs_markdown":"[Skip to main content ↓](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/#page-main-content)\n\n[REVENUE DRIVEN FOR OUR CLIENTS \\$10,085,355,239+](https:\/\/www.webfx.com\/about\/results\/)\n\n- [Client Login](https:\/\/app.webfx.com\/)\n- [888-601-5359](tel:8886015359)\n\n[Get a Proposal](https:\/\/www.webfx.com\/free-quote\/)\n\n[![WebFX Logo](https:\/\/www.webfx.com\/wp-content\/uploads\/2023\/05\/webfx-logo.svg)](https:\/\/www.webfx.com\/)\n\nDigital Marketing  \nThat Drives Revenue®\n\n[Client Login](https:\/\/app.webfx.com\/)\n\n[Get a Proposal](https:\/\/www.webfx.com\/free-quote\/)\n\n#### [Table of Contents](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/)\n- [1×× Informational](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/#d0a9cf3592146f2382df7408407ef608-0)\n- [2×× Success](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/#d0a9cf3592146f2382df7408407ef608-1)\n- [3×× Redirection](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/#d0a9cf3592146f2382df7408407ef608-2)\n- [4×× Client Error](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/#d0a9cf3592146f2382df7408407ef608-3)\n- [5×× Server Error](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/#d0a9cf3592146f2382df7408407ef608-4)\n\n# HTTP Status Codes Glossary\n> HTTP status codes shape how browsers, users, and search engines interact with your site. Developers use them for debugging, while marketers and SEOs rely on them to monitor crawlability, fix errors, and protect rankings.\n> \n> This list is an easy-to-reference database of HTTP status codes with their definitions and helpful code references all in one place.\n> \n> Visit an individual status code via https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-\\_\\_\\_-status-code\/ or browse the list below.\n## 1×× Informational\n|   |   |   |\n|---|---|---|\n| **Code** | **Meaning** | **SEO \/ Use Case** |\n| [100 Continue](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-100-status-code\/) | Request received, client should proceed. | Rarely used in SEO. |\n| [101 Switching Protocols](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-101-status-code\/) | Server switching per request. | No SEO impact. |\n| [102 Processing](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-102-status-code\/) | Server received the request and continues processing; no final response yet. | Used for long operations (WebDAV); no SEO impact. |\n## 2×× Success\n|   |   |   |\n|---|---|---|\n| **Code** | **Meaning** | **SEO \/ Use Case** |\n| [200 Ok](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-200-status-code\/) | Request succeeded. | Standard response crawlers need. |\n| [201 Created](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-201-status-code\/) | Resource created (often POST). | API\/creation success; not crawl-related. |\n| [202 Accepted](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-202-status-code\/) | Request received, processing pending. | Async ops; no SEO effect. |\n| [203 Non-Authoritative Information](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-203-status-code\/) | Response from transforming proxy. | Rare; no SEO value. |\n| [204 No Content](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-204-status-code\/) | Success, no response body. | Useful for APIs. |\n| [205 Reset Content](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-205-status-code\/) | Client should reset the form. | Not SEO-relevant. |\n| [206 Partial Content](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-206-status-code\/) | Server delivered partial range. | Used in media\/large files; no SEO use. |\n| [207 Multi-Status](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-207-status-code\/) | Multiple status codes for WebDAV. | Not SEO-relevant. |\n| [208 Already Reported](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-208-status-code\/) | WebDAV code; avoids repeats. | Not SEO-relevant. |\n| [226 IM Used](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-226-status-code\/) | Server applied delta encoding. | Rare; not SEO-related. |\n## 3×× Redirection\n|   |   |   |\n|---|---|---|\n| **Code** | **Meaning** | **SEO \/ Use Case** |\n| [300 Multiple Choices](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-300-status-code\/) | Several options for resource. | May confuse crawlers; avoid. |\n| [301 Moved Permanently](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-301-status-code\/) | Resource permanently redirected. | SEO-friendly redirect. |\n| [302 Found](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-302-status-code\/) | Temporary redirect. | Avoid long-term SEO; [use 301](https:\/\/www.webfx.com\/blog\/marketing\/301-vs-302-redirect\/). |\n| [303 See Other](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-303-status-code\/) | Directs client to another URI (GET). | Used in form submissions. |\n| [304 Not Modified](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-304-status-code\/) | Client can use cached version. | Helps reduce crawl load. |\n| [305 Use Proxy](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-305-status-code\/) | Must access via proxy. | Deprecated; ignore. |\n| [307 Temporary Redirect](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-307-status-code\/) | Same as 302, but method preserved. | For temp moves; no long-term SEO. |\n| [308 Permanent Redirect](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-308-status-code\/) | Same as 301 but method preserved. | Good SEO alternative to 301. |\n## 4×× Client Error\n|   |   |   |\n|---|---|---|\n| **Code** | **Meaning** | **SEO \/ Use Case** |\n| [400 Bad Request](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-400-status-code\/) | Invalid request syntax. | Check logs; fix malformed URLs. |\n| [401 Unauthorized](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-401-status-code\/) | Authentication required. | May block crawlers unintentionally. |\n| [402 Payment Required](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-402-status-code\/) | Reserved for future use. | Not SEO-relevant. |\n| [403 Forbidden](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-403-status-code\/) | Server refused request. | Ensure important pages aren’t restricted |\n| [404 Not Found](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-404-status-code\/) | Page not found. | [Redirect](https:\/\/www.webfx.com\/blog\/web-design\/what-is-a-redirect\/) or customize the page. Redirects explained. |\n| [405 Method Not Allowed](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-405-status-code\/) | Request method not permitted. | Rare; check API endpoints. |\n| [406 Not Acceptable](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-406-status-code\/) | Resource can’t return requested format. | Rare; not SEO-focused. |\n| [407 Proxy Authentication Required](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-407-status-code\/) | Client must authenticate proxy. | Not SEO-relevant. |\n| [408 Request Timeout](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-408-status-code\/) | Server timed out waiting for request. | Could disrupt [crawlers](https:\/\/www.webfx.com\/blog\/internet\/what-is-a-web-crawler\/). |\n| [409 Conflict](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-409-status-code\/) | Request conflict (e.g., edit conflicts). | Web apps; not SEO. |\n| [410 Gone](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-410-status-code\/) | Resource intentionally removed. | Tells search engines page is gone. |\n| [411 Length Required](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-411-status-code\/) | Missing *Content-Length.* | Rare; not SEO. |\n| [412 Precondition Failed](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-412-status-code\/) | Conditions not met. | API\/webdav use. |\n| [413 Payload Too Large](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-413-status-code\/) | Request entity too large. | Rare; no SEO. |\n| [414 Request-URI Too Long](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-414-status-code\/) | URL exceeds max length. | Avoid overly long URLs in SEO. |\n| [415 Unsupported Media Type](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-415-status-code\/) | Server refuses type. | No SEO impact. |\n| [416 Requested Range Not Satisfiable](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-416-status-code\/) | Invalid range header. | No SEO impact. |\n| [417 Expectation Failed](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-417-status-code\/) | Server can’t meet Expect header. | Rare. |\n| [418 I’m a Teapot](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-418-status-code\/) | Joke code (RFC 2324). | None. |\n| [421 Misdirected Request](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-421-status-code\/) | Request to wrong server. | CDN issues. |\n| [422 Unprocessable Entity](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-422-status-code\/) | Semantic errors in request. | WebDAV; not SEO. |\n| [423 Locked](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-423-status-code\/) | Resource locked. | WebDAV. |\n| [424 Failed Dependency](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-424-status-code\/) | Request failed due to dependency. | WebDAV. |\n| [426 Upgrade Required](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-426-status-code\/) | Client must switch protocols. | Not SEO. |\n| [428 Precondition Required](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-428-status-code\/) | Server requires conditions. | Rare. |\n| [429 Too Many Requests](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-429-status-code\/) | Rate-limited. | May block bots. |\n| [431 Request Header Fields Too Large](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-431-status-code\/) | Headers too big. | Could block [crawlers](https:\/\/www.webfx.com\/blog\/internet\/what-is-a-web-crawler\/). |\n| [444 Connection Closed Without Response](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-444-status-code\/) | Server drops the connection without sending a response (nginx). Often used to terminate unwanted or suspicious requests. | Treat as a network error. Audit WAF\/CDN rules to avoid false positives that block crawlers. Monitor error rates and server logs |\n| [451 Unavailable for Legal Reasons](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-451-status-code\/) | The server denies access to the resource due to legal demands (e.g., DMCA, government restrictions). | May cause content to disappear from search results; signals deliberate removal. |\n| [499 Client Closed Request](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-499-status-code\/) | Client closes the connection before the server sends a response (nginx). | Investigate long TTFB, client timeouts, and CDN\/proxy disconnects. Crawlers log a fetch failure; reduce latency and stabilize origin performance. |\n## 5×× Server Error\n|   |   |   |\n|---|---|---|\n| **Code** | **Meaning** | **SEO \/ Use Case** |\n| [500 Internal Server Error](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-500-status-code\/) | Generic server error. | Fix immediately; harms SEO. |\n| [501 Not Implemented](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-501-status-code\/) | Server lacks functionality. | Rare. |\n| [502 Bad Gateway](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-502-status-code\/) | Invalid response from upstream. | Check hosting\/CDN. |\n| [503 Service Unavailable](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-503-status-code\/) | Server overloaded or down. | Use for planned downtime. |\n| [504 Gateway Timeout](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-504-status-code\/) | Upstream didn’t respond. | Hosting\/CDN issues. |\n| [505 HTTP Version Not Supported](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-505-status-code\/) | Version not supported. | Rare. |\n| [506 Variant Also Negotiates](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-506-status-code\/) | Config error in content negotiation. | Rare. |\n| [507 Insufficient Storage](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-507-status-code\/) | Server out of storage (WebDAV). | Not SEO. |\n| [508 Loop Detected](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-508-status-code\/) | Infinite loop in request. | WebDAV. |\n| [510 Not Extended](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-510-status-code\/) | Extensions required. | Rare. |\n| [511 Network Authentication Required](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-511-status-code\/) | Network login required. | Not SEO impact |\n| [599 Network Connect Timeout Error](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-599-status-code\/) | Network timeout not covered by 504; used by HAProxy, some CDNs. | Signals upstream instability. Monitor hosting\/CDN; prolonged use may impact crawl reliability. |\n\nAdditional resources\n\n- [Learn about web development](https:\/\/www.webfx.com\/web-development\/)\n- [Learn about SEO](https:\/\/www.webfx.com\/seo\/)\n- [Web development services from WebFX](https:\/\/www.webfx.com\/web-development\/services\/)\n- [SEO services from WebFX](https:\/\/www.webfx.com\/seo\/services\/)\n- [MDN Web Docs](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Status)\n- [W3Schools](https:\/\/www.w3schools.com\/tags\/ref_httpmessages.asp)\n\n#### [Table of Contents](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/)\n- [1×× Informational](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/#d0a9cf3592146f2382df7408407ef608-0)\n- [2×× Success](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/#d0a9cf3592146f2382df7408407ef608-1)\n- [3×× Redirection](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/#d0a9cf3592146f2382df7408407ef608-2)\n- [4×× Client Error](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/#d0a9cf3592146f2382df7408407ef608-3)\n- [5×× Server Error](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/#d0a9cf3592146f2382df7408407ef608-4)\n\n#### [Related Resources](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/)\n- [Ecommerce Web Development](https:\/\/www.webfx.com\/web-development\/ecommerce\/)\n- [VPS Hosting: What is It and What Does It Mean for Your Company?](https:\/\/www.webfx.com\/blog\/marketing\/vps-hosting\/)\n- [Web Development Glossary](https:\/\/www.webfx.com\/web-development\/glossary\/)\n- [What is a 100 Status Code?](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-100-status-code\/)\n- [What is a 101 Status Code?](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-101-status-code\/)\n- [What is a 102 Status Code?](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-102-status-code\/)\n- [What is a 200 Status Code?](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-200-status-code\/)\n- [What is a 201 Status Code?](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-201-status-code\/)\n- [What is a 202 Status Code?](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-202-status-code\/)\n- [What is a 208 Status Code?](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-208-status-code\/)\n\n#### [Marketing Tips for Niche Industries](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/)\n- [How to Measure and Maximize Construction Marketing ROI](https:\/\/www.webfx.com\/blog\/home-services\/construction-marketing-roi\/)\n- [How to Offer Ecommerce Customer Service](https:\/\/www.webfx.com\/industries\/retail-ecommerce\/ecommerce\/customer-service\/)\n- [How to Plan a Marketing Budget for Energy and Utilities Companies](https:\/\/www.webfx.com\/blog\/home-services\/energy-and-utilities-marketing-budget\/)\n- [How to Plan Your Healthcare Marketing Budget for 2026](https:\/\/www.webfx.com\/blog\/healthcare\/marketing-budget\/)\n- [HVAC Marketing Agency](https:\/\/www.webfx.com\/industries\/home-services\/hvac\/)\n- [HVAC Marketing Pricing: How Much Does HVAC Marketing Cost?](https:\/\/www.webfx.com\/blog\/home-services\/hvac-marketing-pricing\/)\n- [Inbound Marketing for Realtors](https:\/\/www.webfx.com\/industries\/real-estate\/realtors\/inbound-marketing\/)\n- [Industrial Marketing Agency](https:\/\/www.webfx.com\/industries\/industrial\/agency\/)\n- [Industrial Marketing Pricing: How Much Does Industrial Marketing Cost?](https:\/\/www.webfx.com\/blog\/industrial\/marketing-pricing\/)\n- [Is TaskRabbit Worth It for Home Service Providers?](https:\/\/www.webfx.com\/blog\/home-services\/is-taskrabbit-worth-it\/)\n\n#### [Find Us Driving Revenue Nationwide](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/)\n- [Ft Myers, FL](https:\/\/www.webfx.com\/locations\/ft-myers-fl\/)\n- [GEO for Harrisburg, PA](https:\/\/www.webfx.com\/locations\/harrisburg-pa\/generative-engine-optimization\/)\n- [Harrisburg, PA](https:\/\/www.webfx.com\/locations\/harrisburg-pa\/)\n- [Houston, TX](https:\/\/www.webfx.com\/locations\/houston-tx\/)\n- [Indianapolis, in](https:\/\/www.webfx.com\/locations\/indianapolis-in\/)\n- [Jacksonville, FL](https:\/\/www.webfx.com\/locations\/jacksonville-fl\/)\n- [Lancaster, PA](https:\/\/www.webfx.com\/locations\/lancaster-pa\/)\n- [London, UK](https:\/\/www.webfx.com\/locations\/london-uk\/)\n- [Los Angeles, CA](https:\/\/www.webfx.com\/locations\/los-angeles-ca\/)\n- [Orlando, FL](https:\/\/www.webfx.com\/locations\/orlando-fl\/)\n\n## FAQs about HTTP status codes\nLearn more about HTTP status codes with these FAQs:\n\n#### [What are HTTP status codes?](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/)\nHTTP status codes are three-digit numbers that are returned by servers to indicate the status of a client’s request. When a client (such as a web browser) makes a request to a server, the server will respond with a status code and a message indicating whether the request was successful or not.\n\n#### [What are the HTTP status code classes?](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/)\nThere are five classes of HTTP status codes, each identified by the first digit of the three-digit status code. The classes are as follows:\n\n#### 1xx (Informational)\nThese status codes indicate that the server has received the request and is continuing to process it. They are primarily used to convey information about the status of the request while it is being processed.\n\n#### 2xx (Successful)\nThese status codes indicate that the request was successfully received, understood, and accepted by the server. They are typically used to indicate that the requested action has been successfully completed.\n\n#### 3xx (Redirection)\nThese status codes indicate that the client needs to take additional action to complete the request. They are typically used to redirect the client to a different resource or location.\n\n#### 4xx (Client Error)\nThese status codes indicate that the server cannot process the request because the client has made an error. They are typically caused by issues such as invalid input, authentication problems, or insufficient permissions.\n\n#### 5xx (Server Error)\nThese status codes indicate that the server encountered an error while processing the request. They are typically caused by issues such as server overload, programming errors, or infrastructure problems.\n\n#### [Which HTTP status codes affect SEO?](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/)\nSeveral HTTP status codes are important for SEO, including:\n\n#### 200 OK\nThis is the most common status code and indicates that the server has successfully processed the request and returned the requested resource. This is the ideal status code to receive for search engine optimization purposes as it indicates that the content is available and accessible to both users and search engines.\n\n#### 301 Moved Permanently\nThis status code indicates that the requested resource has been permanently moved to a new URL. This is important for SEO because it ensures that search engines can redirect users to the new URL and transfer the SEO value of the old URL to the new one.\n\n#### 404 Not Found\nThis status code indicates that the requested resource is not available on the server. This can be problematic for SEO because it indicates to both users and search engines that the content is not available. It is important to fix 404 errors as soon as possible to avoid losing SEO value and providing a poor user experience.\n\n#### 503 Service Unavailable\nThis status code indicates that the server is temporarily unavailable due to maintenance or overload. This can be problematic for SEO because search engines may interpret this as a sign of an unreliable website. It is important to fix 503 errors as soon as possible to avoid losing SEO value and providing a poor user experience.\n\nIn general, it is important to monitor and fix any HTTP status codes that could negatively impact user experience or search engine indexing.\n\n#### [Do unofficial HTTP status codes affect SEO?](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/)\nMost unofficial codes (like [418](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-418-status-code\/)) don’t impact SEO because search engines focus on standard 2xx, 3xx, 4xx, and 5xx codes.\n\nTO TOP\n\n- 24,859,684+ LEADS DRIVEN  \n  FOR CLIENTS\n- \\$10,085,355,239+ REVENUE DRIVEN  \n  FOR CLIENTS\n- 3,212,407 HOURS OF  \n  EXPERTISE\n- 750 EXPERTS  \n  ON STAFF\n\n- - - ![WebFX Logo](https:\/\/www.webfx.com\/wp-content\/themes\/fx\/assets\/img\/footer\/webfx-logo.png) Celebrating 25+ Years of Digital Marketing Excellence\n      \n      Ready to speak with a marketing expert? 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[Private Equity Due Diligence](https:\/\/www.webfx.com\/digital-marketing\/services\/digital-due-diligence\/)\n      - [Revenue Operations](https:\/\/www.webfx.com\/digital-marketing\/services\/revenue-operations\/)\n  - - ![Light green square and blue plus sign](https:\/\/www.webfx.com\/wp-content\/uploads\/2023\/05\/icon-commerce-platforms.svg)Conversion\n      - [Conversion Rate Optimization](https:\/\/www.webfx.com\/digital-marketing\/services\/conversion-rate-optimization\/)\n      - [User Experience Testing](https:\/\/www.webfx.com\/web-design\/services\/ux-analysis\/)\n      - [Landing Pages & Funnels](https:\/\/www.webfx.com\/ppc\/services\/landing-page-design\/)\n      - [Online Review Acceleration](https:\/\/www.webfx.com\/technology\/revenuecloudfx\/reviewaccelerationfx\/)\n      - [Channel Partner Sales Pipeline Management](https:\/\/www.webfx.com\/digital-marketing\/agency\/channel-partner-marketing\/)\n      - [Website Personalization](https:\/\/www.webfx.com\/content-marketing\/services\/personalized-website-content\/)\n  - - ![Finger tapping buy icon.](https:\/\/www.webfx.com\/wp-content\/uploads\/2023\/05\/icon-amazon.svg)Marketing Automation\n      - [Account-Based Marketing Services](https:\/\/www.webfx.com\/digital-advertising\/services\/account-based-marketing\/)\n      - [Lead Nurture Email Marketing](https:\/\/www.webfx.com\/email-marketing\/services\/lead-nurture-marketing\/)\n      - [Email Marketing Management](https:\/\/www.webfx.com\/email-marketing\/services\/)\n      - [Salesforce Marketing Automation](https:\/\/www.webfx.com\/martech\/services\/salesforce-consultants\/)\n      - [Microsoft Dynamics Marketing Automation](https:\/\/www.webfx.com\/martech\/services\/microsoft-dynamics\/)\n      - [Employment & Recruiting Marketing](https:\/\/www.webfx.com\/digital-marketing\/services\/digital-recruitment\/)\n  - - ![icon-b2b](https:\/\/www.webfx.com\/wp-content\/uploads\/2023\/05\/icon-b2b.svg)Commerce Platforms\n      - [SEO for Amazon](https:\/\/www.webfx.com\/amazon\/services\/amazon-seo-listing-optimization-service\/)\n      - [Advertising Management for Amazon](https:\/\/www.webfx.com\/amazon\/services\/advertising\/)\n      - [Shopify Optimization Services](https:\/\/www.webfx.com\/seo\/services\/shopify\/)\n      - [Facebook Marketplace for Business](https:\/\/www.webfx.com\/social-media\/services\/facebook-marketplace\/)\n      - [Influencer Marketing Services](https:\/\/www.webfx.com\/social-media\/services\/influencer-marketing\/)\n      - [Walmart Marketplace Advertising](https:\/\/www.webfx.com\/marketplaces\/services\/walmart\/)\n  - - - 30%+\n        \n        #### increase in ecommerce sales\n        [Read Our Case Study](https:\/\/www.webfx.com\/portfolio\/case-studies\/s-clyde-weaver\/)\n  \n  Close\n- [UX & AI Services](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/)\n  - - ![Blue and purple laptop shape](https:\/\/www.webfx.com\/wp-content\/uploads\/2023\/05\/icon-ux.svg)Design\n      - [Website Design](https:\/\/www.webfx.com\/web-design\/services\/)\n      - [Website Redesign](https:\/\/www.webfx.com\/web-design\/services\/redesign\/)\n      - [Rapid Web Design](https:\/\/www.webfx.com\/web-design\/services\/rainmakerfx\/)\n      - [Social Media Design](https:\/\/www.webfx.com\/social-media\/services\/design\/)\n      - [Ecommerce Website Design](https:\/\/www.webfx.com\/web-design\/services\/ecommerce\/)\n      - [Email Marketing Testing & Design](https:\/\/www.webfx.com\/email-marketing\/services\/design\/)\n  - - ![Content marketing icon with pencil and paper.](https:\/\/www.webfx.com\/wp-content\/uploads\/2023\/05\/icon-content-marketing.svg)AI Services\n      - [AI Consulting](https:\/\/www.webfx.com\/martech\/agency\/ai-consulting-firm\/)\n      - [AI Digital Marketing Services](https:\/\/www.webfx.com\/martech\/services\/ai\/)\n      - [ChatGPT Optimization](https:\/\/www.webfx.com\/seo\/services\/chatgpt-optimization\/)\n      - [AI Agent Development](https:\/\/www.webfx.com\/martech\/services\/ai-agent-development\/)\n      - [AI & GPT Integration](https:\/\/www.webfx.com\/martech\/services\/ai-integration\/)\n      - [Enterprise GEO Services](https:\/\/www.webfx.com\/seo\/services\/enterprise-ai-search-optimization\/)\n  - - ![Development icon.](https:\/\/www.webfx.com\/wp-content\/uploads\/2023\/05\/icon-development.svg)Development\n      - [Digital Experience Development](https:\/\/www.webfx.com\/web-development\/services\/)\n      - [WordPress Development](https:\/\/www.webfx.com\/web-development\/services\/wordpress\/)\n      - [Shopify Ecommerce Development](https:\/\/www.webfx.com\/web-development\/services\/shopify\/)\n      - [Web Infrastructure & Maintenance](https:\/\/www.webfx.com\/web-development\/services\/website-maintenance\/)\n      - [Content Management Systems](https:\/\/www.webfx.com\/web-development\/services\/cms\/)\n      - [ADA Compliance Services](https:\/\/www.webfx.com\/web-development\/services\/ada-compliance\/)\n  - - ![Learn icon of lightbulb.](https:\/\/www.webfx.com\/wp-content\/uploads\/2023\/05\/icon-learn-ux.svg)Challenges We Solve\n      - [My Website Doesn’t Drive Leads](https:\/\/www.webfx.com\/about\/our-approach\/website-doesnt-drive-leads\/ \"Troubleshoot lead generation\")\n      - [My Website Traffic Is Going Down](https:\/\/www.webfx.com\/about\/our-approach\/why-is-my-website-traffic-going-down\/ \"Troubleshoot website traffic\")\n      - [My Website Doesn’t Convert](https:\/\/www.webfx.com\/about\/our-approach\/my-website-doesnt-convert\/ \"Troubleshoot conversion rates\")\n      - [My Website Isn’t Driving ROI](https:\/\/www.webfx.com\/about\/our-approach\/my-website-isnt-driving-business-growth\/ \"Troubleshoot site revenue\")\n      - [My Website Isn’t Showing Up on Google](https:\/\/www.webfx.com\/about\/our-approach\/site-isnt-showing-up-on-google\/ \"Troubleshoot indexing issues\")\n      - [My Agency Isn’t Driving Results](https:\/\/www.webfx.com\/about\/our-approach\/my-agency-isnt-driving-results\/ \"Troubleshoot agency performance\")\n  - - - ### The WebFX Portfolio\n        [View Design Portfolio](https:\/\/www.webfx.com\/portfolio\/design-portfolio\/)\n  \n  Close\n- [Revenue Platform](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/)\n  - - ![Green bar graphs with upwards blue arrow](https:\/\/www.webfx.com\/wp-content\/uploads\/2023\/05\/icon-revenue.svg)Revenue Acceleration Platform\n      - [RevenueCloudFX Revenue Platform](https:\/\/www.webfx.com\/technology\/revenuecloudfx\/)\n      - [CRM Integrations](https:\/\/www.webfx.com\/technology\/revenuecloudfx\/crm-integration\/)\n      - [Customer Data Platform (CDP)](https:\/\/www.webfx.com\/martech\/services\/customer-data-platform\/)\n      - [Lead Management & Scheduling Solutions](https:\/\/www.webfx.com\/martech\/services\/lead-management\/)\n      - [CRM Retargeting Technology](https:\/\/www.webfx.com\/digital-advertising\/services\/crm-retargeting\/)\n      - [Contact Enrichment](https:\/\/www.webfx.com\/digital-marketing\/services\/contact-enrichment\/)\n  - - - #### Industry-leading revenue acceleration platform\n        ![Rocket](https:\/\/www.webfx.com\/wp-content\/themes\/fx\/assets\/img\/header\/v2\/rocket.svg)\n        \n        ##### A next-level approach to digital\n        WebFX's proprietary digital marketing platform makes it easier than ever to track digital marketing performance, conduct industry research, calculate ROI, and make strategic decisions.\n        \n        [View RevenueCloudFX](https:\/\/www.webfx.com\/technology\/revenuecloudfx\/)\n  - - - #### Simple, all-in-one CRM platform for B2B\n        ![Nutshell Acorn Logo](https:\/\/www.webfx.com\/wp-content\/themes\/fx\/assets\/img\/header\/v2\/nutshell-acorn-logo.png)\n        \n        ##### Equip your sales team to win\n        Meet Nutshell, the CRM we've built from the ground up to help you reach your sales goals. Powerful features like workflow automation and centralized customer data make closing deals easier than ever.\n        \n        [View Nutshell](https:\/\/www.webfx.com\/technology\/nutshell\/)\n  \n  Close\n- [About](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/)\n  - - [Careers (We Are Hiring!)](https:\/\/www.webfx.com\/careers\/)\n  - - ![Orange chat bubble shape and blue star shape](https:\/\/www.webfx.com\/wp-content\/uploads\/2023\/05\/icon-who-we-are.svg)Who We Are\n      - [Our Approach](https:\/\/www.webfx.com\/about\/our-approach\/ \"Explore our approach to digital marketing\")\n      - [About Us](https:\/\/www.webfx.com\/about\/ \"Get to know WebFX\")\n      - [Careers (We Are Hiring!)](https:\/\/www.webfx.com\/careers\/ \"Explore open positions\")\n      - [Contact Info](https:\/\/www.webfx.com\/contact\/ \"Learn how to contact us\")\n      - [WebFX Reviews](https:\/\/www.webfx.com\/about\/reviews\/ \"Read our reviews\")\n      - [Awards](https:\/\/www.webfx.com\/about\/awards\/ \"Browse our awards\")\n  - - ![Orange circle and blue leaf shape](https:\/\/www.webfx.com\/wp-content\/uploads\/2023\/05\/icon-community.svg)Community Impact\n      - [Company Values](https:\/\/www.webfx.com\/about\/company-values\/ \"Explore our POSITIVE values\")\n      - [Community Impact](https:\/\/www.webfx.com\/about\/charities\/ \"Explore our community impact\")\n      - [FXBuilds](https:\/\/www.webfx.com\/about\/fxbuilds\/ \"Explore FXBuilds projects\")\n      - [Equality at WebFX](https:\/\/equality.webfx.com\/ \"Explore our commitment to equality\")\n      - [STEMFX Program](https:\/\/www.webfx.com\/about\/stem-fx\/ \"Explore our STEMFX program\")\n      - [WebFX History](https:\/\/www.webfx.com\/about\/history\/ \"Explore our history\")\n  - - ![Blue circle with a dollar sign](https:\/\/www.webfx.com\/wp-content\/uploads\/2023\/05\/icon-pricing.svg)Pricing Guides\n      - [How Much Should a Website Cost?](https:\/\/www.webfx.com\/web-design\/pricing\/website-costs\/ \"Explore website costs\")\n      - [How Much Does SEO Cost?](https:\/\/www.webfx.com\/seo\/pricing\/ \"Explore SEO costs\")\n      - [How Much Does PPC Cost?](https:\/\/www.webfx.com\/ppc\/pricing\/ \"Explore PPC costs\")\n      - [How Much Does Generative Engine Optimization Cost?](https:\/\/www.webfx.com\/blog\/ai\/generative-engine-optimization-cost\/ \"Explore GEO costs\")\n      - [Social Media Pricing](https:\/\/www.webfx.com\/blog\/social-media\/social-media-pricing\/ \"Explore social media costs\")\n      - [Local SEO Pricing](https:\/\/www.webfx.com\/local-seo\/pricing\/ \"Explore local SEO costs\")\n  - - ![Blue and orange book shape](https:\/\/www.webfx.com\/wp-content\/uploads\/2023\/05\/icon-content-library.svg)Content Library\n      - [Our Blog](https:\/\/www.webfx.com\/blog\/ \"View our latest posts\")\n      - [SEO Checker Report](https:\/\/www.webfx.com\/seo-checker\/ \"Get a free SEO audit\")\n      - [Free Keyword Suggestion Tool](https:\/\/www.webfx.com\/tools\/keywordsfx\/ \"Get keyword suggestions\")\n      - [Fix Your Funnel](https:\/\/www.webfx.com\/tools\/fix-marketing-funnel\/ \"Find marketing funnel leaks\")\n      - [FAQFox](https:\/\/www.webfx.com\/seo-tools\/faqfox\/ \"Generate content topics\")\n      - [View All Tools](https:\/\/www.webfx.com\/tools\/ \"Explore all tools\")\n  - - - #### \\#1Best Place to Work in PA\n        [View Careers](https:\/\/www.webfx.com\/careers\/)\n  \n  Close","attrs_readable_markdown":"#### [Table of Contents](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/)\n- [1×× Informational](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/#d0a9cf3592146f2382df7408407ef608-0)\n- [2×× Success](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/#d0a9cf3592146f2382df7408407ef608-1)\n- [3×× Redirection](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/#d0a9cf3592146f2382df7408407ef608-2)\n- [4×× Client Error](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/#d0a9cf3592146f2382df7408407ef608-3)\n- [5×× Server Error](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/#d0a9cf3592146f2382df7408407ef608-4)\n\n> HTTP status codes shape how browsers, users, and search engines interact with your site. Developers use them for debugging, while marketers and SEOs rely on them to monitor crawlability, fix errors, and protect rankings.\n> \n> This list is an easy-to-reference database of HTTP status codes with their definitions and helpful code references all in one place.\n> \n> Visit an individual status code via https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-\\_\\_\\_-status-code\/ or browse the list below.\n## 1×× Informational\n|   |   |   |\n|---|---|---|\n| **Code** | **Meaning** | **SEO \/ Use Case** |\n| [100 Continue](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-100-status-code\/) | Request received, client should proceed. | Rarely used in SEO. |\n| [101 Switching Protocols](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-101-status-code\/) | Server switching per request. | No SEO impact. |\n| [102 Processing](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-102-status-code\/) | Server received the request and continues processing; no final response yet. | Used for long operations (WebDAV); no SEO impact. |\n## 2×× Success\n|   |   |   |\n|---|---|---|\n| **Code** | **Meaning** | **SEO \/ Use Case** |\n| [200 Ok](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-200-status-code\/) | Request succeeded. | Standard response crawlers need. |\n| [201 Created](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-201-status-code\/) | Resource created (often POST). | API\/creation success; not crawl-related. |\n| [202 Accepted](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-202-status-code\/) | Request received, processing pending. | Async ops; no SEO effect. |\n| [203 Non-Authoritative Information](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-203-status-code\/) | Response from transforming proxy. | Rare; no SEO value. |\n| [204 No Content](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-204-status-code\/) | Success, no response body. | Useful for APIs. |\n| [205 Reset Content](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-205-status-code\/) | Client should reset the form. | Not SEO-relevant. |\n| [206 Partial Content](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-206-status-code\/) | Server delivered partial range. | Used in media\/large files; no SEO use. |\n| [207 Multi-Status](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-207-status-code\/) | Multiple status codes for WebDAV. | Not SEO-relevant. |\n| [208 Already Reported](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-208-status-code\/) | WebDAV code; avoids repeats. | Not SEO-relevant. |\n| [226 IM Used](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-226-status-code\/) | Server applied delta encoding. | Rare; not SEO-related. |\n## 3×× Redirection\n|   |   |   |\n|---|---|---|\n| **Code** | **Meaning** | **SEO \/ Use Case** |\n| [300 Multiple Choices](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-300-status-code\/) | Several options for resource. | May confuse crawlers; avoid. |\n| [301 Moved Permanently](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-301-status-code\/) | Resource permanently redirected. | SEO-friendly redirect. |\n| [302 Found](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-302-status-code\/) | Temporary redirect. | Avoid long-term SEO; [use 301](https:\/\/www.webfx.com\/blog\/marketing\/301-vs-302-redirect\/). |\n| [303 See Other](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-303-status-code\/) | Directs client to another URI (GET). | Used in form submissions. |\n| [304 Not Modified](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-304-status-code\/) | Client can use cached version. | Helps reduce crawl load. |\n| [305 Use Proxy](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-305-status-code\/) | Must access via proxy. | Deprecated; ignore. |\n| [307 Temporary Redirect](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-307-status-code\/) | Same as 302, but method preserved. | For temp moves; no long-term SEO. |\n| [308 Permanent Redirect](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-308-status-code\/) | Same as 301 but method preserved. | Good SEO alternative to 301. |\n## 4×× Client Error\n|   |   |   |\n|---|---|---|\n| **Code** | **Meaning** | **SEO \/ Use Case** |\n| [400 Bad Request](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-400-status-code\/) | Invalid request syntax. | Check logs; fix malformed URLs. |\n| [401 Unauthorized](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-401-status-code\/) | Authentication required. | May block crawlers unintentionally. |\n| [402 Payment Required](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-402-status-code\/) | Reserved for future use. | Not SEO-relevant. |\n| [403 Forbidden](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-403-status-code\/) | Server refused request. | Ensure important pages aren’t restricted |\n| [404 Not Found](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-404-status-code\/) | Page not found. | [Redirect](https:\/\/www.webfx.com\/blog\/web-design\/what-is-a-redirect\/) or customize the page. Redirects explained. |\n| [405 Method Not Allowed](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-405-status-code\/) | Request method not permitted. | Rare; check API endpoints. |\n| [406 Not Acceptable](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-406-status-code\/) | Resource can’t return requested format. | Rare; not SEO-focused. |\n| [407 Proxy Authentication Required](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-407-status-code\/) | Client must authenticate proxy. | Not SEO-relevant. |\n| [408 Request Timeout](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-408-status-code\/) | Server timed out waiting for request. | Could disrupt [crawlers](https:\/\/www.webfx.com\/blog\/internet\/what-is-a-web-crawler\/). |\n| [409 Conflict](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-409-status-code\/) | Request conflict (e.g., edit conflicts). | Web apps; not SEO. |\n| [410 Gone](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-410-status-code\/) | Resource intentionally removed. | Tells search engines page is gone. |\n| [411 Length Required](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-411-status-code\/) | Missing *Content-Length.* | Rare; not SEO. |\n| [412 Precondition Failed](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-412-status-code\/) | Conditions not met. | API\/webdav use. |\n| [413 Payload Too Large](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-413-status-code\/) | Request entity too large. | Rare; no SEO. |\n| [414 Request-URI Too Long](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-414-status-code\/) | URL exceeds max length. | Avoid overly long URLs in SEO. |\n| [415 Unsupported Media Type](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-415-status-code\/) | Server refuses type. | No SEO impact. |\n| [416 Requested Range Not Satisfiable](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-416-status-code\/) | Invalid range header. | No SEO impact. |\n| [417 Expectation Failed](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-417-status-code\/) | Server can’t meet Expect header. | Rare. |\n| [418 I’m a Teapot](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-418-status-code\/) | Joke code (RFC 2324). | None. |\n| [421 Misdirected Request](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-421-status-code\/) | Request to wrong server. | CDN issues. |\n| [422 Unprocessable Entity](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-422-status-code\/) | Semantic errors in request. | WebDAV; not SEO. |\n| [423 Locked](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-423-status-code\/) | Resource locked. | WebDAV. |\n| [424 Failed Dependency](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-424-status-code\/) | Request failed due to dependency. | WebDAV. |\n| [426 Upgrade Required](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-426-status-code\/) | Client must switch protocols. | Not SEO. |\n| [428 Precondition Required](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-428-status-code\/) | Server requires conditions. | Rare. |\n| [429 Too Many Requests](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-429-status-code\/) | Rate-limited. | May block bots. |\n| [431 Request Header Fields Too Large](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-431-status-code\/) | Headers too big. | Could block [crawlers](https:\/\/www.webfx.com\/blog\/internet\/what-is-a-web-crawler\/). |\n| [444 Connection Closed Without Response](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-444-status-code\/) | Server drops the connection without sending a response (nginx). Often used to terminate unwanted or suspicious requests. | Treat as a network error. Audit WAF\/CDN rules to avoid false positives that block crawlers. Monitor error rates and server logs |\n| [451 Unavailable for Legal Reasons](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-451-status-code\/) | The server denies access to the resource due to legal demands (e.g., DMCA, government restrictions). | May cause content to disappear from search results; signals deliberate removal. |\n| [499 Client Closed Request](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-499-status-code\/) | Client closes the connection before the server sends a response (nginx). | Investigate long TTFB, client timeouts, and CDN\/proxy disconnects. Crawlers log a fetch failure; reduce latency and stabilize origin performance. |\n## 5×× Server Error\n|   |   |   |\n|---|---|---|\n| **Code** | **Meaning** | **SEO \/ Use Case** |\n| [500 Internal Server Error](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-500-status-code\/) | Generic server error. | Fix immediately; harms SEO. |\n| [501 Not Implemented](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-501-status-code\/) | Server lacks functionality. | Rare. |\n| [502 Bad Gateway](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-502-status-code\/) | Invalid response from upstream. | Check hosting\/CDN. |\n| [503 Service Unavailable](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-503-status-code\/) | Server overloaded or down. | Use for planned downtime. |\n| [504 Gateway Timeout](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-504-status-code\/) | Upstream didn’t respond. | Hosting\/CDN issues. |\n| [505 HTTP Version Not Supported](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-505-status-code\/) | Version not supported. | Rare. |\n| [506 Variant Also Negotiates](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-506-status-code\/) | Config error in content negotiation. | Rare. |\n| [507 Insufficient Storage](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-507-status-code\/) | Server out of storage (WebDAV). | Not SEO. |\n| [508 Loop Detected](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-508-status-code\/) | Infinite loop in request. | WebDAV. |\n| [510 Not Extended](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-510-status-code\/) | Extensions required. | Rare. |\n| [511 Network Authentication Required](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-511-status-code\/) | Network login required. | Not SEO impact |\n| [599 Network Connect Timeout Error](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/what-is-a-599-status-code\/) | Network timeout not covered by 504; used by HAProxy, some CDNs. | Signals upstream instability. Monitor hosting\/CDN; prolonged use may impact crawl reliability. |\n\nAdditional resources\n\n- [Learn about web development](https:\/\/www.webfx.com\/web-development\/)\n- [Learn about SEO](https:\/\/www.webfx.com\/seo\/)\n- [Web development services from WebFX](https:\/\/www.webfx.com\/web-development\/services\/)\n- [SEO services from WebFX](https:\/\/www.webfx.com\/seo\/services\/)\n- [MDN Web Docs](https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTTP\/Status)\n- [W3Schools](https:\/\/www.w3schools.com\/tags\/ref_httpmessages.asp)\n\nFAQs about HTTP status codes\n\nLearn more about HTTP status codes with these FAQs:\n\n#### [What are HTTP status codes?](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/)\nHTTP status codes are three-digit numbers that are returned by servers to indicate the status of a client’s request. When a client (such as a web browser) makes a request to a server, the server will respond with a status code and a message indicating whether the request was successful or not.\n\n#### [What are the HTTP status code classes?](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/)\nThere are five classes of HTTP status codes, each identified by the first digit of the three-digit status code. The classes are as follows:\n\n#### 1xx (Informational)\nThese status codes indicate that the server has received the request and is continuing to process it. They are primarily used to convey information about the status of the request while it is being processed.\n\n#### 2xx (Successful)\nThese status codes indicate that the request was successfully received, understood, and accepted by the server. They are typically used to indicate that the requested action has been successfully completed.\n\n#### 3xx (Redirection)\nThese status codes indicate that the client needs to take additional action to complete the request. They are typically used to redirect the client to a different resource or location.\n\n#### 4xx (Client Error)\nThese status codes indicate that the server cannot process the request because the client has made an error. They are typically caused by issues such as invalid input, authentication problems, or insufficient permissions.\n\n#### 5xx (Server Error)\nThese status codes indicate that the server encountered an error while processing the request. They are typically caused by issues such as server overload, programming errors, or infrastructure problems.\n\n#### [Which HTTP status codes affect SEO?](https:\/\/www.webfx.com\/web-development\/glossary\/http-status-codes\/)\nSeveral HTTP status codes are important for SEO, including:\n\n#### 200 OK\nThis is the most common status code and indicates that the server has successfully processed the request and returned the requested resource. This is the ideal status code to receive for search engine optimization purposes as it indicates that the content is available and accessible to both users and search engines.\n\n#### 301 Moved Permanently\nThis status code indicates that the requested resource has been permanently moved to a new URL. This is important for SEO because it ensures that search engines can redirect users to the new URL and transfer the SEO value of the old URL to the new one.\n\n#### 404 Not Found\nThis status code indicates that the requested resource is not available on the server. This can be problematic for SEO because it indicates to both users and search engines that the content is not available. It is important to fix 404 errors as soon as possible to avoid losing SEO value and providing a poor user experience.\n\n#### 503 Service Unavailable\nThis status code indicates that the server is temporarily unavailable due to maintenance or overload. This can be problematic for SEO because search engines may interpret this as a sign of an unreliable website. It is important to fix 503 errors as soon as possible to avoid losing SEO value and providing a poor user experience.\n\nIn general, it is important to monitor and fix any HTTP status codes that could negatively impact user experience or search engine indexing.","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

1 day 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://www.webfx.com/web-development/glossary/http-status-codes/
Last Crawled	2026-04-13 05:47:56 (1 day ago)
First Indexed	2022-03-07 10:40:55 (4 years ago)
HTTP Status Code	200
Meta Title	HTTP Status Codes Glossary - WebFX
Meta Description	Wondering what an HTTP status code means? Browse this list of HTTP status codes for definitions and code references.
Meta Canonical	null
Boilerpipe Text	Table of Contents 1×× Informational 2×× Success 3×× Redirection 4×× Client Error 5×× Server Error HTTP status codes shape how browsers, users, and search engines interact with your site. Developers use them for debugging, while marketers and SEOs rely on them to monitor crawlability, fix errors, and protect rankings. This list is an easy-to-reference database of HTTP status codes with their definitions and helpful code references all in one place. Visit an individual status code via https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-___-status-code/ or browse the list below. 1×× Informational Code Meaning SEO / Use Case 100 Continue Request received, client should proceed. Rarely used in SEO. 101 Switching Protocols Server switching per request. No SEO impact. 102 Processing Server received the request and continues processing; no final response yet. Used for long operations (WebDAV); no SEO impact. 2×× Success Code Meaning SEO / Use Case 200 Ok Request succeeded. Standard response crawlers need. 201 Created Resource created (often POST). API/creation success; not crawl-related. 202 Accepted Request received, processing pending. Async ops; no SEO effect. 203 Non-Authoritative Information Response from transforming proxy. Rare; no SEO value. 204 No Content Success, no response body. Useful for APIs. 205 Reset Content Client should reset the form. Not SEO-relevant. 206 Partial Content Server delivered partial range. Used in media/large files; no SEO use. 207 Multi-Status Multiple status codes for WebDAV. Not SEO-relevant. 208 Already Reported WebDAV code; avoids repeats. Not SEO-relevant. 226 IM Used Server applied delta encoding. Rare; not SEO-related. 3×× Redirection Code Meaning SEO / Use Case 300 Multiple Choices Several options for resource. May confuse crawlers; avoid. 301 Moved Permanently Resource permanently redirected. SEO-friendly redirect. 302 Found Temporary redirect. Avoid long-term SEO; use 301 . 303 See Other Directs client to another URI (GET). Used in form submissions. 304 Not Modified Client can use cached version. Helps reduce crawl load. 305 Use Proxy Must access via proxy. Deprecated; ignore. 307 Temporary Redirect Same as 302, but method preserved. For temp moves; no long-term SEO. 308 Permanent Redirect Same as 301 but method preserved. Good SEO alternative to 301. 4×× Client Error Code Meaning SEO / Use Case 400 Bad Request Invalid request syntax. Check logs; fix malformed URLs. 401 Unauthorized Authentication required. May block crawlers unintentionally. 402 Payment Required Reserved for future use. Not SEO-relevant. 403 Forbidden Server refused request. Ensure important pages aren’t restricted 404 Not Found Page not found. Redirect or customize the page. Redirects explained. 405 Method Not Allowed Request method not permitted. Rare; check API endpoints. 406 Not Acceptable Resource can’t return requested format. Rare; not SEO-focused. 407 Proxy Authentication Required Client must authenticate proxy. Not SEO-relevant. 408 Request Timeout Server timed out waiting for request. Could disrupt crawlers . 409 Conflict Request conflict (e.g., edit conflicts). Web apps; not SEO. 410 Gone Resource intentionally removed. Tells search engines page is gone. 411 Length Required Missing Content-Length. Rare; not SEO. 412 Precondition Failed Conditions not met. API/webdav use. 413 Payload Too Large Request entity too large. Rare; no SEO. 414 Request-URI Too Long URL exceeds max length. Avoid overly long URLs in SEO. 415 Unsupported Media Type Server refuses type. No SEO impact. 416 Requested Range Not Satisfiable Invalid range header. No SEO impact. 417 Expectation Failed Server can’t meet Expect header. Rare. 418 I’m a Teapot Joke code (RFC 2324). None. 421 Misdirected Request Request to wrong server. CDN issues. 422 Unprocessable Entity Semantic errors in request. WebDAV; not SEO. 423 Locked Resource locked. WebDAV. 424 Failed Dependency Request failed due to dependency. WebDAV. 426 Upgrade Required Client must switch protocols. Not SEO. 428 Precondition Required Server requires conditions. Rare. 429 Too Many Requests Rate-limited. May block bots. 431 Request Header Fields Too Large Headers too big. Could block crawlers . 444 Connection Closed Without Response Server drops the connection without sending a response (nginx). Often used to terminate unwanted or suspicious requests. Treat as a network error. Audit WAF/CDN rules to avoid false positives that block crawlers. Monitor error rates and server logs 451 Unavailable for Legal Reasons The server denies access to the resource due to legal demands (e.g., DMCA, government restrictions). May cause content to disappear from search results; signals deliberate removal. 499 Client Closed Request Client closes the connection before the server sends a response (nginx). Investigate long TTFB, client timeouts, and CDN/proxy disconnects. Crawlers log a fetch failure; reduce latency and stabilize origin performance. 5×× Server Error Code Meaning SEO / Use Case 500 Internal Server Error Generic server error. Fix immediately; harms SEO. 501 Not Implemented Server lacks functionality. Rare. 502 Bad Gateway Invalid response from upstream. Check hosting/CDN. 503 Service Unavailable Server overloaded or down. Use for planned downtime. 504 Gateway Timeout Upstream didn’t respond. Hosting/CDN issues. 505 HTTP Version Not Supported Version not supported. Rare. 506 Variant Also Negotiates Config error in content negotiation. Rare. 507 Insufficient Storage Server out of storage (WebDAV). Not SEO. 508 Loop Detected Infinite loop in request. WebDAV. 510 Not Extended Extensions required. Rare. 511 Network Authentication Required Network login required. Not SEO impact 599 Network Connect Timeout Error Network timeout not covered by 504; used by HAProxy, some CDNs. Signals upstream instability. Monitor hosting/CDN; prolonged use may impact crawl reliability. Additional resources Learn about web development Learn about SEO Web development services from WebFX SEO services from WebFX MDN Web Docs W3Schools FAQs about HTTP status codes Learn more about HTTP status codes with these FAQs: What are HTTP status codes? HTTP status codes are three-digit numbers that are returned by servers to indicate the status of a client’s request. When a client (such as a web browser) makes a request to a server, the server will respond with a status code and a message indicating whether the request was successful or not. What are the HTTP status code classes? There are five classes of HTTP status codes, each identified by the first digit of the three-digit status code. The classes are as follows: 1xx (Informational) These status codes indicate that the server has received the request and is continuing to process it. They are primarily used to convey information about the status of the request while it is being processed. 2xx (Successful) These status codes indicate that the request was successfully received, understood, and accepted by the server. They are typically used to indicate that the requested action has been successfully completed. 3xx (Redirection) These status codes indicate that the client needs to take additional action to complete the request. They are typically used to redirect the client to a different resource or location. 4xx (Client Error) These status codes indicate that the server cannot process the request because the client has made an error. They are typically caused by issues such as invalid input, authentication problems, or insufficient permissions. 5xx (Server Error) These status codes indicate that the server encountered an error while processing the request. They are typically caused by issues such as server overload, programming errors, or infrastructure problems. Which HTTP status codes affect SEO? Several HTTP status codes are important for SEO, including: 200 OK This is the most common status code and indicates that the server has successfully processed the request and returned the requested resource. This is the ideal status code to receive for search engine optimization purposes as it indicates that the content is available and accessible to both users and search engines. 301 Moved Permanently This status code indicates that the requested resource has been permanently moved to a new URL. This is important for SEO because it ensures that search engines can redirect users to the new URL and transfer the SEO value of the old URL to the new one. 404 Not Found This status code indicates that the requested resource is not available on the server. This can be problematic for SEO because it indicates to both users and search engines that the content is not available. It is important to fix 404 errors as soon as possible to avoid losing SEO value and providing a poor user experience. 503 Service Unavailable This status code indicates that the server is temporarily unavailable due to maintenance or overload. This can be problematic for SEO because search engines may interpret this as a sign of an unreliable website. It is important to fix 503 errors as soon as possible to avoid losing SEO value and providing a poor user experience. In general, it is important to monitor and fix any HTTP status codes that could negatively impact user experience or search engine indexing.
Markdown	[Skip to main content ↓](https://www.webfx.com/web-development/glossary/http-status-codes/#page-main-content) [REVENUE DRIVEN FOR OUR CLIENTS \$10,085,355,239+](https://www.webfx.com/about/results/) - [Client Login](https://app.webfx.com/) - [888-601-5359](tel:8886015359) [Get a Proposal](https://www.webfx.com/free-quote/) [![WebFX Logo](https://www.webfx.com/wp-content/uploads/2023/05/webfx-logo.svg)](https://www.webfx.com/) Digital Marketing That Drives Revenue® [Client Login](https://app.webfx.com/) [Get a Proposal](https://www.webfx.com/free-quote/) #### [Table of Contents](https://www.webfx.com/web-development/glossary/http-status-codes/) - [1×× Informational](https://www.webfx.com/web-development/glossary/http-status-codes/#d0a9cf3592146f2382df7408407ef608-0) - [2×× Success](https://www.webfx.com/web-development/glossary/http-status-codes/#d0a9cf3592146f2382df7408407ef608-1) - [3×× Redirection](https://www.webfx.com/web-development/glossary/http-status-codes/#d0a9cf3592146f2382df7408407ef608-2) - [4×× Client Error](https://www.webfx.com/web-development/glossary/http-status-codes/#d0a9cf3592146f2382df7408407ef608-3) - [5×× Server Error](https://www.webfx.com/web-development/glossary/http-status-codes/#d0a9cf3592146f2382df7408407ef608-4) # HTTP Status Codes Glossary > HTTP status codes shape how browsers, users, and search engines interact with your site. Developers use them for debugging, while marketers and SEOs rely on them to monitor crawlability, fix errors, and protect rankings. > > This list is an easy-to-reference database of HTTP status codes with their definitions and helpful code references all in one place. > > Visit an individual status code via https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-\_\_\_-status-code/ or browse the list below. ## 1×× Informational \| \| \| \| \|---\|---\|---\| \| Code \| Meaning \| SEO / Use Case \| \| [100 Continue](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-100-status-code/) \| Request received, client should proceed. \| Rarely used in SEO. \| \| [101 Switching Protocols](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-101-status-code/) \| Server switching per request. \| No SEO impact. \| \| [102 Processing](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-102-status-code/) \| Server received the request and continues processing; no final response yet. \| Used for long operations (WebDAV); no SEO impact. \| ## 2×× Success \| \| \| \| \|---\|---\|---\| \| Code \| Meaning \| SEO / Use Case \| \| [200 Ok](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-200-status-code/) \| Request succeeded. \| Standard response crawlers need. \| \| [201 Created](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-201-status-code/) \| Resource created (often POST). \| API/creation success; not crawl-related. \| \| [202 Accepted](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-202-status-code/) \| Request received, processing pending. \| Async ops; no SEO effect. \| \| [203 Non-Authoritative Information](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-203-status-code/) \| Response from transforming proxy. \| Rare; no SEO value. \| \| [204 No Content](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-204-status-code/) \| Success, no response body. \| Useful for APIs. \| \| [205 Reset Content](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-205-status-code/) \| Client should reset the form. \| Not SEO-relevant. \| \| [206 Partial Content](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-206-status-code/) \| Server delivered partial range. \| Used in media/large files; no SEO use. \| \| [207 Multi-Status](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-207-status-code/) \| Multiple status codes for WebDAV. \| Not SEO-relevant. \| \| [208 Already Reported](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-208-status-code/) \| WebDAV code; avoids repeats. \| Not SEO-relevant. \| \| [226 IM Used](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-226-status-code/) \| Server applied delta encoding. \| Rare; not SEO-related. \| ## 3×× Redirection \| \| \| \| \|---\|---\|---\| \| Code \| Meaning \| SEO / Use Case \| \| [300 Multiple Choices](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-300-status-code/) \| Several options for resource. \| May confuse crawlers; avoid. \| \| [301 Moved Permanently](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-301-status-code/) \| Resource permanently redirected. \| SEO-friendly redirect. \| \| [302 Found](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-302-status-code/) \| Temporary redirect. \| Avoid long-term SEO; [use 301](https://www.webfx.com/blog/marketing/301-vs-302-redirect/). \| \| [303 See Other](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-303-status-code/) \| Directs client to another URI (GET). \| Used in form submissions. \| \| [304 Not Modified](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-304-status-code/) \| Client can use cached version. \| Helps reduce crawl load. \| \| [305 Use Proxy](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-305-status-code/) \| Must access via proxy. \| Deprecated; ignore. \| \| [307 Temporary Redirect](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-307-status-code/) \| Same as 302, but method preserved. \| For temp moves; no long-term SEO. \| \| [308 Permanent Redirect](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-308-status-code/) \| Same as 301 but method preserved. \| Good SEO alternative to 301. \| ## 4×× Client Error \| \| \| \| \|---\|---\|---\| \| Code \| Meaning \| SEO / Use Case \| \| [400 Bad Request](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-400-status-code/) \| Invalid request syntax. \| Check logs; fix malformed URLs. \| \| [401 Unauthorized](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-401-status-code/) \| Authentication required. \| May block crawlers unintentionally. \| \| [402 Payment Required](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-402-status-code/) \| Reserved for future use. \| Not SEO-relevant. \| \| [403 Forbidden](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-403-status-code/) \| Server refused request. \| Ensure important pages aren’t restricted \| \| [404 Not Found](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-404-status-code/) \| Page not found. \| [Redirect](https://www.webfx.com/blog/web-design/what-is-a-redirect/) or customize the page. Redirects explained. \| \| [405 Method Not Allowed](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-405-status-code/) \| Request method not permitted. \| Rare; check API endpoints. \| \| [406 Not Acceptable](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-406-status-code/) \| Resource can’t return requested format. \| Rare; not SEO-focused. \| \| [407 Proxy Authentication Required](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-407-status-code/) \| Client must authenticate proxy. \| Not SEO-relevant. \| \| [408 Request Timeout](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-408-status-code/) \| Server timed out waiting for request. \| Could disrupt [crawlers](https://www.webfx.com/blog/internet/what-is-a-web-crawler/). \| \| [409 Conflict](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-409-status-code/) \| Request conflict (e.g., edit conflicts). \| Web apps; not SEO. \| \| [410 Gone](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-410-status-code/) \| Resource intentionally removed. \| Tells search engines page is gone. \| \| [411 Length Required](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-411-status-code/) \| Missing Content-Length. \| Rare; not SEO. \| \| [412 Precondition Failed](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-412-status-code/) \| Conditions not met. \| API/webdav use. \| \| [413 Payload Too Large](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-413-status-code/) \| Request entity too large. \| Rare; no SEO. \| \| [414 Request-URI Too Long](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-414-status-code/) \| URL exceeds max length. \| Avoid overly long URLs in SEO. \| \| [415 Unsupported Media Type](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-415-status-code/) \| Server refuses type. \| No SEO impact. \| \| [416 Requested Range Not Satisfiable](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-416-status-code/) \| Invalid range header. \| No SEO impact. \| \| [417 Expectation Failed](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-417-status-code/) \| Server can’t meet Expect header. \| Rare. \| \| [418 I’m a Teapot](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-418-status-code/) \| Joke code (RFC 2324). \| None. \| \| [421 Misdirected Request](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-421-status-code/) \| Request to wrong server. \| CDN issues. \| \| [422 Unprocessable Entity](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-422-status-code/) \| Semantic errors in request. \| WebDAV; not SEO. \| \| [423 Locked](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-423-status-code/) \| Resource locked. \| WebDAV. \| \| [424 Failed Dependency](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-424-status-code/) \| Request failed due to dependency. \| WebDAV. \| \| [426 Upgrade Required](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-426-status-code/) \| Client must switch protocols. \| Not SEO. \| \| [428 Precondition Required](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-428-status-code/) \| Server requires conditions. \| Rare. \| \| [429 Too Many Requests](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-429-status-code/) \| Rate-limited. \| May block bots. \| \| [431 Request Header Fields Too Large](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-431-status-code/) \| Headers too big. \| Could block [crawlers](https://www.webfx.com/blog/internet/what-is-a-web-crawler/). \| \| [444 Connection Closed Without Response](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-444-status-code/) \| Server drops the connection without sending a response (nginx). Often used to terminate unwanted or suspicious requests. \| Treat as a network error. Audit WAF/CDN rules to avoid false positives that block crawlers. Monitor error rates and server logs \| \| [451 Unavailable for Legal Reasons](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-451-status-code/) \| The server denies access to the resource due to legal demands (e.g., DMCA, government restrictions). \| May cause content to disappear from search results; signals deliberate removal. \| \| [499 Client Closed Request](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-499-status-code/) \| Client closes the connection before the server sends a response (nginx). \| Investigate long TTFB, client timeouts, and CDN/proxy disconnects. Crawlers log a fetch failure; reduce latency and stabilize origin performance. \| ## 5×× Server Error \| \| \| \| \|---\|---\|---\| \| Code \| Meaning \| SEO / Use Case \| \| [500 Internal Server Error](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-500-status-code/) \| Generic server error. \| Fix immediately; harms SEO. \| \| [501 Not Implemented](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-501-status-code/) \| Server lacks functionality. \| Rare. \| \| [502 Bad Gateway](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-502-status-code/) \| Invalid response from upstream. \| Check hosting/CDN. \| \| [503 Service Unavailable](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-503-status-code/) \| Server overloaded or down. \| Use for planned downtime. \| \| [504 Gateway Timeout](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-504-status-code/) \| Upstream didn’t respond. \| Hosting/CDN issues. \| \| [505 HTTP Version Not Supported](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-505-status-code/) \| Version not supported. \| Rare. \| \| [506 Variant Also Negotiates](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-506-status-code/) \| Config error in content negotiation. \| Rare. \| \| [507 Insufficient Storage](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-507-status-code/) \| Server out of storage (WebDAV). \| Not SEO. \| \| [508 Loop Detected](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-508-status-code/) \| Infinite loop in request. \| WebDAV. \| \| [510 Not Extended](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-510-status-code/) \| Extensions required. \| Rare. \| \| [511 Network Authentication Required](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-511-status-code/) \| Network login required. \| Not SEO impact \| \| [599 Network Connect Timeout Error](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-599-status-code/) \| Network timeout not covered by 504; used by HAProxy, some CDNs. \| Signals upstream instability. Monitor hosting/CDN; prolonged use may impact crawl reliability. \| Additional resources - [Learn about web development](https://www.webfx.com/web-development/) - [Learn about SEO](https://www.webfx.com/seo/) - [Web development services from WebFX](https://www.webfx.com/web-development/services/) - [SEO services from WebFX](https://www.webfx.com/seo/services/) - [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/HTTP/Status) - [W3Schools](https://www.w3schools.com/tags/ref_httpmessages.asp) #### [Table of Contents](https://www.webfx.com/web-development/glossary/http-status-codes/) - [1×× Informational](https://www.webfx.com/web-development/glossary/http-status-codes/#d0a9cf3592146f2382df7408407ef608-0) - [2×× Success](https://www.webfx.com/web-development/glossary/http-status-codes/#d0a9cf3592146f2382df7408407ef608-1) - [3×× Redirection](https://www.webfx.com/web-development/glossary/http-status-codes/#d0a9cf3592146f2382df7408407ef608-2) - [4×× Client Error](https://www.webfx.com/web-development/glossary/http-status-codes/#d0a9cf3592146f2382df7408407ef608-3) - [5×× Server Error](https://www.webfx.com/web-development/glossary/http-status-codes/#d0a9cf3592146f2382df7408407ef608-4) #### [Related Resources](https://www.webfx.com/web-development/glossary/http-status-codes/) - [Ecommerce Web Development](https://www.webfx.com/web-development/ecommerce/) - [VPS Hosting: What is It and What Does It Mean for Your Company?](https://www.webfx.com/blog/marketing/vps-hosting/) - [Web Development Glossary](https://www.webfx.com/web-development/glossary/) - [What is a 100 Status Code?](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-100-status-code/) - [What is a 101 Status Code?](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-101-status-code/) - [What is a 102 Status Code?](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-102-status-code/) - [What is a 200 Status Code?](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-200-status-code/) - [What is a 201 Status Code?](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-201-status-code/) - [What is a 202 Status Code?](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-202-status-code/) - [What is a 208 Status Code?](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-208-status-code/) #### [Marketing Tips for Niche Industries](https://www.webfx.com/web-development/glossary/http-status-codes/) - [How to Measure and Maximize Construction Marketing ROI](https://www.webfx.com/blog/home-services/construction-marketing-roi/) - [How to Offer Ecommerce Customer Service](https://www.webfx.com/industries/retail-ecommerce/ecommerce/customer-service/) - [How to Plan a Marketing Budget for Energy and Utilities Companies](https://www.webfx.com/blog/home-services/energy-and-utilities-marketing-budget/) - [How to Plan Your Healthcare Marketing Budget for 2026](https://www.webfx.com/blog/healthcare/marketing-budget/) - [HVAC Marketing Agency](https://www.webfx.com/industries/home-services/hvac/) - [HVAC Marketing Pricing: How Much Does HVAC Marketing Cost?](https://www.webfx.com/blog/home-services/hvac-marketing-pricing/) - [Inbound Marketing for Realtors](https://www.webfx.com/industries/real-estate/realtors/inbound-marketing/) - [Industrial Marketing Agency](https://www.webfx.com/industries/industrial/agency/) - [Industrial Marketing Pricing: How Much Does Industrial Marketing Cost?](https://www.webfx.com/blog/industrial/marketing-pricing/) - [Is TaskRabbit Worth It for Home Service Providers?](https://www.webfx.com/blog/home-services/is-taskrabbit-worth-it/) #### [Find Us Driving Revenue Nationwide](https://www.webfx.com/web-development/glossary/http-status-codes/) - [Ft Myers, FL](https://www.webfx.com/locations/ft-myers-fl/) - [GEO for Harrisburg, PA](https://www.webfx.com/locations/harrisburg-pa/generative-engine-optimization/) - [Harrisburg, PA](https://www.webfx.com/locations/harrisburg-pa/) - [Houston, TX](https://www.webfx.com/locations/houston-tx/) - [Indianapolis, in](https://www.webfx.com/locations/indianapolis-in/) - [Jacksonville, FL](https://www.webfx.com/locations/jacksonville-fl/) - [Lancaster, PA](https://www.webfx.com/locations/lancaster-pa/) - [London, UK](https://www.webfx.com/locations/london-uk/) - [Los Angeles, CA](https://www.webfx.com/locations/los-angeles-ca/) - [Orlando, FL](https://www.webfx.com/locations/orlando-fl/) ## FAQs about HTTP status codes Learn more about HTTP status codes with these FAQs: #### [What are HTTP status codes?](https://www.webfx.com/web-development/glossary/http-status-codes/) HTTP status codes are three-digit numbers that are returned by servers to indicate the status of a client’s request. When a client (such as a web browser) makes a request to a server, the server will respond with a status code and a message indicating whether the request was successful or not. #### [What are the HTTP status code classes?](https://www.webfx.com/web-development/glossary/http-status-codes/) There are five classes of HTTP status codes, each identified by the first digit of the three-digit status code. The classes are as follows: #### 1xx (Informational) These status codes indicate that the server has received the request and is continuing to process it. They are primarily used to convey information about the status of the request while it is being processed. #### 2xx (Successful) These status codes indicate that the request was successfully received, understood, and accepted by the server. They are typically used to indicate that the requested action has been successfully completed. #### 3xx (Redirection) These status codes indicate that the client needs to take additional action to complete the request. They are typically used to redirect the client to a different resource or location. #### 4xx (Client Error) These status codes indicate that the server cannot process the request because the client has made an error. They are typically caused by issues such as invalid input, authentication problems, or insufficient permissions. #### 5xx (Server Error) These status codes indicate that the server encountered an error while processing the request. They are typically caused by issues such as server overload, programming errors, or infrastructure problems. #### [Which HTTP status codes affect SEO?](https://www.webfx.com/web-development/glossary/http-status-codes/) Several HTTP status codes are important for SEO, including: #### 200 OK This is the most common status code and indicates that the server has successfully processed the request and returned the requested resource. This is the ideal status code to receive for search engine optimization purposes as it indicates that the content is available and accessible to both users and search engines. #### 301 Moved Permanently This status code indicates that the requested resource has been permanently moved to a new URL. This is important for SEO because it ensures that search engines can redirect users to the new URL and transfer the SEO value of the old URL to the new one. #### 404 Not Found This status code indicates that the requested resource is not available on the server. This can be problematic for SEO because it indicates to both users and search engines that the content is not available. It is important to fix 404 errors as soon as possible to avoid losing SEO value and providing a poor user experience. #### 503 Service Unavailable This status code indicates that the server is temporarily unavailable due to maintenance or overload. This can be problematic for SEO because search engines may interpret this as a sign of an unreliable website. It is important to fix 503 errors as soon as possible to avoid losing SEO value and providing a poor user experience. In general, it is important to monitor and fix any HTTP status codes that could negatively impact user experience or search engine indexing. #### [Do unofficial HTTP status codes affect SEO?](https://www.webfx.com/web-development/glossary/http-status-codes/) Most unofficial codes (like [418](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-418-status-code/)) don’t impact SEO because search engines focus on standard 2xx, 3xx, 4xx, and 5xx codes. TO TOP - 24,859,684+ LEADS DRIVEN FOR CLIENTS - \$10,085,355,239+ REVENUE DRIVEN FOR CLIENTS - 3,212,407 HOURS OF EXPERTISE - 750 EXPERTS ON STAFF - - - ![WebFX Logo](https://www.webfx.com/wp-content/themes/fx/assets/img/footer/webfx-logo.png) Celebrating 25+ Years of Digital Marketing Excellence Ready to speak with a marketing expert? 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- - 198% #### Increase in organic transactions [Read Our Case Study](https://www.webfx.com/portfolio/case-studies/koa/) Close - [Revenue Marketing & CRO](https://www.webfx.com/web-development/glossary/http-status-codes/) - - ![Light green geometric shape and blue flame shape](https://www.webfx.com/wp-content/uploads/2023/05/icon-digital-marketing.svg)Digital Intelligence - [Web Channel Call Tracking](https://www.webfx.com/analytics/services/call-tracking/) - [SEO Reporting & Forecasting](https://www.webfx.com/seo/services/custom-reporting/) - [Channel Attribution & Forecasting](https://www.webfx.com/analytics/services/channel-attribution-forecasting/) - [Digital Marketing Competitor Analysis](https://www.webfx.com/digital-marketing/services/competitor-analysis/) - [Private Equity Due Diligence](https://www.webfx.com/digital-marketing/services/digital-due-diligence/) - [Revenue Operations](https://www.webfx.com/digital-marketing/services/revenue-operations/) - - ![Light green square and blue plus sign](https://www.webfx.com/wp-content/uploads/2023/05/icon-commerce-platforms.svg)Conversion - [Conversion Rate Optimization](https://www.webfx.com/digital-marketing/services/conversion-rate-optimization/) - [User Experience Testing](https://www.webfx.com/web-design/services/ux-analysis/) - [Landing Pages & Funnels](https://www.webfx.com/ppc/services/landing-page-design/) - [Online Review Acceleration](https://www.webfx.com/technology/revenuecloudfx/reviewaccelerationfx/) - [Channel Partner Sales Pipeline Management](https://www.webfx.com/digital-marketing/agency/channel-partner-marketing/) - [Website Personalization](https://www.webfx.com/content-marketing/services/personalized-website-content/) - - ![Finger tapping buy icon.](https://www.webfx.com/wp-content/uploads/2023/05/icon-amazon.svg)Marketing Automation - [Account-Based Marketing Services](https://www.webfx.com/digital-advertising/services/account-based-marketing/) - [Lead Nurture Email Marketing](https://www.webfx.com/email-marketing/services/lead-nurture-marketing/) - [Email Marketing Management](https://www.webfx.com/email-marketing/services/) - [Salesforce Marketing Automation](https://www.webfx.com/martech/services/salesforce-consultants/) - [Microsoft Dynamics Marketing Automation](https://www.webfx.com/martech/services/microsoft-dynamics/) - [Employment & Recruiting Marketing](https://www.webfx.com/digital-marketing/services/digital-recruitment/) - - ![icon-b2b](https://www.webfx.com/wp-content/uploads/2023/05/icon-b2b.svg)Commerce Platforms - [SEO for Amazon](https://www.webfx.com/amazon/services/amazon-seo-listing-optimization-service/) - [Advertising Management for Amazon](https://www.webfx.com/amazon/services/advertising/) - [Shopify Optimization Services](https://www.webfx.com/seo/services/shopify/) - [Facebook Marketplace for Business](https://www.webfx.com/social-media/services/facebook-marketplace/) - [Influencer Marketing Services](https://www.webfx.com/social-media/services/influencer-marketing/) - [Walmart Marketplace Advertising](https://www.webfx.com/marketplaces/services/walmart/) - - - 30%+ #### increase in ecommerce sales [Read Our Case Study](https://www.webfx.com/portfolio/case-studies/s-clyde-weaver/) Close - [UX & AI Services](https://www.webfx.com/web-development/glossary/http-status-codes/) - - ![Blue and purple laptop shape](https://www.webfx.com/wp-content/uploads/2023/05/icon-ux.svg)Design - [Website Design](https://www.webfx.com/web-design/services/) - [Website Redesign](https://www.webfx.com/web-design/services/redesign/) - [Rapid Web Design](https://www.webfx.com/web-design/services/rainmakerfx/) - [Social Media Design](https://www.webfx.com/social-media/services/design/) - [Ecommerce Website Design](https://www.webfx.com/web-design/services/ecommerce/) - [Email Marketing Testing & Design](https://www.webfx.com/email-marketing/services/design/) - - ![Content marketing icon with pencil and paper.](https://www.webfx.com/wp-content/uploads/2023/05/icon-content-marketing.svg)AI Services - [AI Consulting](https://www.webfx.com/martech/agency/ai-consulting-firm/) - [AI Digital Marketing Services](https://www.webfx.com/martech/services/ai/) - [ChatGPT Optimization](https://www.webfx.com/seo/services/chatgpt-optimization/) - [AI Agent Development](https://www.webfx.com/martech/services/ai-agent-development/) - [AI & GPT Integration](https://www.webfx.com/martech/services/ai-integration/) - [Enterprise GEO Services](https://www.webfx.com/seo/services/enterprise-ai-search-optimization/) - - ![Development icon.](https://www.webfx.com/wp-content/uploads/2023/05/icon-development.svg)Development - [Digital Experience Development](https://www.webfx.com/web-development/services/) - [WordPress Development](https://www.webfx.com/web-development/services/wordpress/) - [Shopify Ecommerce Development](https://www.webfx.com/web-development/services/shopify/) - [Web Infrastructure & Maintenance](https://www.webfx.com/web-development/services/website-maintenance/) - [Content Management Systems](https://www.webfx.com/web-development/services/cms/) - [ADA Compliance Services](https://www.webfx.com/web-development/services/ada-compliance/) - - ![Learn icon of lightbulb.](https://www.webfx.com/wp-content/uploads/2023/05/icon-learn-ux.svg)Challenges We Solve - [My Website Doesn’t Drive Leads](https://www.webfx.com/about/our-approach/website-doesnt-drive-leads/ "Troubleshoot lead generation") - [My Website Traffic Is Going Down](https://www.webfx.com/about/our-approach/why-is-my-website-traffic-going-down/ "Troubleshoot website traffic") - [My Website Doesn’t Convert](https://www.webfx.com/about/our-approach/my-website-doesnt-convert/ "Troubleshoot conversion rates") - [My Website Isn’t Driving ROI](https://www.webfx.com/about/our-approach/my-website-isnt-driving-business-growth/ "Troubleshoot site revenue") - [My Website Isn’t Showing Up on Google](https://www.webfx.com/about/our-approach/site-isnt-showing-up-on-google/ "Troubleshoot indexing issues") - [My Agency Isn’t Driving Results](https://www.webfx.com/about/our-approach/my-agency-isnt-driving-results/ "Troubleshoot agency performance") - - - ### The WebFX Portfolio [View Design Portfolio](https://www.webfx.com/portfolio/design-portfolio/) Close - [Revenue Platform](https://www.webfx.com/web-development/glossary/http-status-codes/) - - ![Green bar graphs with upwards blue arrow](https://www.webfx.com/wp-content/uploads/2023/05/icon-revenue.svg)Revenue Acceleration Platform - [RevenueCloudFX Revenue Platform](https://www.webfx.com/technology/revenuecloudfx/) - [CRM Integrations](https://www.webfx.com/technology/revenuecloudfx/crm-integration/) - [Customer Data Platform (CDP)](https://www.webfx.com/martech/services/customer-data-platform/) - [Lead Management & Scheduling Solutions](https://www.webfx.com/martech/services/lead-management/) - [CRM Retargeting Technology](https://www.webfx.com/digital-advertising/services/crm-retargeting/) - [Contact Enrichment](https://www.webfx.com/digital-marketing/services/contact-enrichment/) - - - #### Industry-leading revenue acceleration platform ![Rocket](https://www.webfx.com/wp-content/themes/fx/assets/img/header/v2/rocket.svg) ##### A next-level approach to digital WebFX's proprietary digital marketing platform makes it easier than ever to track digital marketing performance, conduct industry research, calculate ROI, and make strategic decisions. [View RevenueCloudFX](https://www.webfx.com/technology/revenuecloudfx/) - - - #### Simple, all-in-one CRM platform for B2B ![Nutshell Acorn Logo](https://www.webfx.com/wp-content/themes/fx/assets/img/header/v2/nutshell-acorn-logo.png) ##### Equip your sales team to win Meet Nutshell, the CRM we've built from the ground up to help you reach your sales goals. Powerful features like workflow automation and centralized customer data make closing deals easier than ever. [View Nutshell](https://www.webfx.com/technology/nutshell/) Close - [About](https://www.webfx.com/web-development/glossary/http-status-codes/) - - [Careers (We Are Hiring!)](https://www.webfx.com/careers/) - - ![Orange chat bubble shape and blue star shape](https://www.webfx.com/wp-content/uploads/2023/05/icon-who-we-are.svg)Who We Are - [Our Approach](https://www.webfx.com/about/our-approach/ "Explore our approach to digital marketing") - [About Us](https://www.webfx.com/about/ "Get to know WebFX") - [Careers (We Are Hiring!)](https://www.webfx.com/careers/ "Explore open positions") - [Contact Info](https://www.webfx.com/contact/ "Learn how to contact us") - [WebFX Reviews](https://www.webfx.com/about/reviews/ "Read our reviews") - [Awards](https://www.webfx.com/about/awards/ "Browse our awards") - - ![Orange circle and blue leaf shape](https://www.webfx.com/wp-content/uploads/2023/05/icon-community.svg)Community Impact - [Company Values](https://www.webfx.com/about/company-values/ "Explore our POSITIVE values") - [Community Impact](https://www.webfx.com/about/charities/ "Explore our community impact") - [FXBuilds](https://www.webfx.com/about/fxbuilds/ "Explore FXBuilds projects") - [Equality at WebFX](https://equality.webfx.com/ "Explore our commitment to equality") - [STEMFX Program](https://www.webfx.com/about/stem-fx/ "Explore our STEMFX program") - [WebFX History](https://www.webfx.com/about/history/ "Explore our history") - - ![Blue circle with a dollar sign](https://www.webfx.com/wp-content/uploads/2023/05/icon-pricing.svg)Pricing Guides - [How Much Should a Website Cost?](https://www.webfx.com/web-design/pricing/website-costs/ "Explore website costs") - [How Much Does SEO Cost?](https://www.webfx.com/seo/pricing/ "Explore SEO costs") - [How Much Does PPC Cost?](https://www.webfx.com/ppc/pricing/ "Explore PPC costs") - [How Much Does Generative Engine Optimization Cost?](https://www.webfx.com/blog/ai/generative-engine-optimization-cost/ "Explore GEO costs") - [Social Media Pricing](https://www.webfx.com/blog/social-media/social-media-pricing/ "Explore social media costs") - [Local SEO Pricing](https://www.webfx.com/local-seo/pricing/ "Explore local SEO costs") - - ![Blue and orange book shape](https://www.webfx.com/wp-content/uploads/2023/05/icon-content-library.svg)Content Library - [Our Blog](https://www.webfx.com/blog/ "View our latest posts") - [SEO Checker Report](https://www.webfx.com/seo-checker/ "Get a free SEO audit") - [Free Keyword Suggestion Tool](https://www.webfx.com/tools/keywordsfx/ "Get keyword suggestions") - [Fix Your Funnel](https://www.webfx.com/tools/fix-marketing-funnel/ "Find marketing funnel leaks") - [FAQFox](https://www.webfx.com/seo-tools/faqfox/ "Generate content topics") - [View All Tools](https://www.webfx.com/tools/ "Explore all tools") - - - #### \#1Best Place to Work in PA [View Careers](https://www.webfx.com/careers/) Close
Readable Markdown	#### [Table of Contents](https://www.webfx.com/web-development/glossary/http-status-codes/) - [1×× Informational](https://www.webfx.com/web-development/glossary/http-status-codes/#d0a9cf3592146f2382df7408407ef608-0) - [2×× Success](https://www.webfx.com/web-development/glossary/http-status-codes/#d0a9cf3592146f2382df7408407ef608-1) - [3×× Redirection](https://www.webfx.com/web-development/glossary/http-status-codes/#d0a9cf3592146f2382df7408407ef608-2) - [4×× Client Error](https://www.webfx.com/web-development/glossary/http-status-codes/#d0a9cf3592146f2382df7408407ef608-3) - [5×× Server Error](https://www.webfx.com/web-development/glossary/http-status-codes/#d0a9cf3592146f2382df7408407ef608-4) > HTTP status codes shape how browsers, users, and search engines interact with your site. Developers use them for debugging, while marketers and SEOs rely on them to monitor crawlability, fix errors, and protect rankings. > > This list is an easy-to-reference database of HTTP status codes with their definitions and helpful code references all in one place. > > Visit an individual status code via https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-\_\_\_-status-code/ or browse the list below. ## 1×× Informational \| \| \| \| \|---\|---\|---\| \| Code \| Meaning \| SEO / Use Case \| \| [100 Continue](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-100-status-code/) \| Request received, client should proceed. \| Rarely used in SEO. \| \| [101 Switching Protocols](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-101-status-code/) \| Server switching per request. \| No SEO impact. \| \| [102 Processing](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-102-status-code/) \| Server received the request and continues processing; no final response yet. \| Used for long operations (WebDAV); no SEO impact. \| ## 2×× Success \| \| \| \| \|---\|---\|---\| \| Code \| Meaning \| SEO / Use Case \| \| [200 Ok](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-200-status-code/) \| Request succeeded. \| Standard response crawlers need. \| \| [201 Created](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-201-status-code/) \| Resource created (often POST). \| API/creation success; not crawl-related. \| \| [202 Accepted](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-202-status-code/) \| Request received, processing pending. \| Async ops; no SEO effect. \| \| [203 Non-Authoritative Information](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-203-status-code/) \| Response from transforming proxy. \| Rare; no SEO value. \| \| [204 No Content](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-204-status-code/) \| Success, no response body. \| Useful for APIs. \| \| [205 Reset Content](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-205-status-code/) \| Client should reset the form. \| Not SEO-relevant. \| \| [206 Partial Content](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-206-status-code/) \| Server delivered partial range. \| Used in media/large files; no SEO use. \| \| [207 Multi-Status](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-207-status-code/) \| Multiple status codes for WebDAV. \| Not SEO-relevant. \| \| [208 Already Reported](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-208-status-code/) \| WebDAV code; avoids repeats. \| Not SEO-relevant. \| \| [226 IM Used](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-226-status-code/) \| Server applied delta encoding. \| Rare; not SEO-related. \| ## 3×× Redirection \| \| \| \| \|---\|---\|---\| \| Code \| Meaning \| SEO / Use Case \| \| [300 Multiple Choices](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-300-status-code/) \| Several options for resource. \| May confuse crawlers; avoid. \| \| [301 Moved Permanently](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-301-status-code/) \| Resource permanently redirected. \| SEO-friendly redirect. \| \| [302 Found](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-302-status-code/) \| Temporary redirect. \| Avoid long-term SEO; [use 301](https://www.webfx.com/blog/marketing/301-vs-302-redirect/). \| \| [303 See Other](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-303-status-code/) \| Directs client to another URI (GET). \| Used in form submissions. \| \| [304 Not Modified](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-304-status-code/) \| Client can use cached version. \| Helps reduce crawl load. \| \| [305 Use Proxy](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-305-status-code/) \| Must access via proxy. \| Deprecated; ignore. \| \| [307 Temporary Redirect](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-307-status-code/) \| Same as 302, but method preserved. \| For temp moves; no long-term SEO. \| \| [308 Permanent Redirect](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-308-status-code/) \| Same as 301 but method preserved. \| Good SEO alternative to 301. \| ## 4×× Client Error \| \| \| \| \|---\|---\|---\| \| Code \| Meaning \| SEO / Use Case \| \| [400 Bad Request](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-400-status-code/) \| Invalid request syntax. \| Check logs; fix malformed URLs. \| \| [401 Unauthorized](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-401-status-code/) \| Authentication required. \| May block crawlers unintentionally. \| \| [402 Payment Required](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-402-status-code/) \| Reserved for future use. \| Not SEO-relevant. \| \| [403 Forbidden](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-403-status-code/) \| Server refused request. \| Ensure important pages aren’t restricted \| \| [404 Not Found](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-404-status-code/) \| Page not found. \| [Redirect](https://www.webfx.com/blog/web-design/what-is-a-redirect/) or customize the page. Redirects explained. \| \| [405 Method Not Allowed](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-405-status-code/) \| Request method not permitted. \| Rare; check API endpoints. \| \| [406 Not Acceptable](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-406-status-code/) \| Resource can’t return requested format. \| Rare; not SEO-focused. \| \| [407 Proxy Authentication Required](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-407-status-code/) \| Client must authenticate proxy. \| Not SEO-relevant. \| \| [408 Request Timeout](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-408-status-code/) \| Server timed out waiting for request. \| Could disrupt [crawlers](https://www.webfx.com/blog/internet/what-is-a-web-crawler/). \| \| [409 Conflict](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-409-status-code/) \| Request conflict (e.g., edit conflicts). \| Web apps; not SEO. \| \| [410 Gone](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-410-status-code/) \| Resource intentionally removed. \| Tells search engines page is gone. \| \| [411 Length Required](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-411-status-code/) \| Missing Content-Length. \| Rare; not SEO. \| \| [412 Precondition Failed](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-412-status-code/) \| Conditions not met. \| API/webdav use. \| \| [413 Payload Too Large](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-413-status-code/) \| Request entity too large. \| Rare; no SEO. \| \| [414 Request-URI Too Long](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-414-status-code/) \| URL exceeds max length. \| Avoid overly long URLs in SEO. \| \| [415 Unsupported Media Type](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-415-status-code/) \| Server refuses type. \| No SEO impact. \| \| [416 Requested Range Not Satisfiable](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-416-status-code/) \| Invalid range header. \| No SEO impact. \| \| [417 Expectation Failed](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-417-status-code/) \| Server can’t meet Expect header. \| Rare. \| \| [418 I’m a Teapot](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-418-status-code/) \| Joke code (RFC 2324). \| None. \| \| [421 Misdirected Request](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-421-status-code/) \| Request to wrong server. \| CDN issues. \| \| [422 Unprocessable Entity](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-422-status-code/) \| Semantic errors in request. \| WebDAV; not SEO. \| \| [423 Locked](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-423-status-code/) \| Resource locked. \| WebDAV. \| \| [424 Failed Dependency](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-424-status-code/) \| Request failed due to dependency. \| WebDAV. \| \| [426 Upgrade Required](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-426-status-code/) \| Client must switch protocols. \| Not SEO. \| \| [428 Precondition Required](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-428-status-code/) \| Server requires conditions. \| Rare. \| \| [429 Too Many Requests](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-429-status-code/) \| Rate-limited. \| May block bots. \| \| [431 Request Header Fields Too Large](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-431-status-code/) \| Headers too big. \| Could block [crawlers](https://www.webfx.com/blog/internet/what-is-a-web-crawler/). \| \| [444 Connection Closed Without Response](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-444-status-code/) \| Server drops the connection without sending a response (nginx). Often used to terminate unwanted or suspicious requests. \| Treat as a network error. Audit WAF/CDN rules to avoid false positives that block crawlers. Monitor error rates and server logs \| \| [451 Unavailable for Legal Reasons](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-451-status-code/) \| The server denies access to the resource due to legal demands (e.g., DMCA, government restrictions). \| May cause content to disappear from search results; signals deliberate removal. \| \| [499 Client Closed Request](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-499-status-code/) \| Client closes the connection before the server sends a response (nginx). \| Investigate long TTFB, client timeouts, and CDN/proxy disconnects. Crawlers log a fetch failure; reduce latency and stabilize origin performance. \| ## 5×× Server Error \| \| \| \| \|---\|---\|---\| \| Code \| Meaning \| SEO / Use Case \| \| [500 Internal Server Error](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-500-status-code/) \| Generic server error. \| Fix immediately; harms SEO. \| \| [501 Not Implemented](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-501-status-code/) \| Server lacks functionality. \| Rare. \| \| [502 Bad Gateway](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-502-status-code/) \| Invalid response from upstream. \| Check hosting/CDN. \| \| [503 Service Unavailable](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-503-status-code/) \| Server overloaded or down. \| Use for planned downtime. \| \| [504 Gateway Timeout](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-504-status-code/) \| Upstream didn’t respond. \| Hosting/CDN issues. \| \| [505 HTTP Version Not Supported](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-505-status-code/) \| Version not supported. \| Rare. \| \| [506 Variant Also Negotiates](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-506-status-code/) \| Config error in content negotiation. \| Rare. \| \| [507 Insufficient Storage](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-507-status-code/) \| Server out of storage (WebDAV). \| Not SEO. \| \| [508 Loop Detected](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-508-status-code/) \| Infinite loop in request. \| WebDAV. \| \| [510 Not Extended](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-510-status-code/) \| Extensions required. \| Rare. \| \| [511 Network Authentication Required](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-511-status-code/) \| Network login required. \| Not SEO impact \| \| [599 Network Connect Timeout Error](https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-599-status-code/) \| Network timeout not covered by 504; used by HAProxy, some CDNs. \| Signals upstream instability. Monitor hosting/CDN; prolonged use may impact crawl reliability. \| Additional resources - [Learn about web development](https://www.webfx.com/web-development/) - [Learn about SEO](https://www.webfx.com/seo/) - [Web development services from WebFX](https://www.webfx.com/web-development/services/) - [SEO services from WebFX](https://www.webfx.com/seo/services/) - [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/HTTP/Status) - [W3Schools](https://www.w3schools.com/tags/ref_httpmessages.asp) FAQs about HTTP status codes Learn more about HTTP status codes with these FAQs: #### [What are HTTP status codes?](https://www.webfx.com/web-development/glossary/http-status-codes/) HTTP status codes are three-digit numbers that are returned by servers to indicate the status of a client’s request. When a client (such as a web browser) makes a request to a server, the server will respond with a status code and a message indicating whether the request was successful or not. #### [What are the HTTP status code classes?](https://www.webfx.com/web-development/glossary/http-status-codes/) There are five classes of HTTP status codes, each identified by the first digit of the three-digit status code. The classes are as follows: #### 1xx (Informational) These status codes indicate that the server has received the request and is continuing to process it. They are primarily used to convey information about the status of the request while it is being processed. #### 2xx (Successful) These status codes indicate that the request was successfully received, understood, and accepted by the server. They are typically used to indicate that the requested action has been successfully completed. #### 3xx (Redirection) These status codes indicate that the client needs to take additional action to complete the request. They are typically used to redirect the client to a different resource or location. #### 4xx (Client Error) These status codes indicate that the server cannot process the request because the client has made an error. They are typically caused by issues such as invalid input, authentication problems, or insufficient permissions. #### 5xx (Server Error) These status codes indicate that the server encountered an error while processing the request. They are typically caused by issues such as server overload, programming errors, or infrastructure problems. #### [Which HTTP status codes affect SEO?](https://www.webfx.com/web-development/glossary/http-status-codes/) Several HTTP status codes are important for SEO, including: #### 200 OK This is the most common status code and indicates that the server has successfully processed the request and returned the requested resource. This is the ideal status code to receive for search engine optimization purposes as it indicates that the content is available and accessible to both users and search engines. #### 301 Moved Permanently This status code indicates that the requested resource has been permanently moved to a new URL. This is important for SEO because it ensures that search engines can redirect users to the new URL and transfer the SEO value of the old URL to the new one. #### 404 Not Found This status code indicates that the requested resource is not available on the server. This can be problematic for SEO because it indicates to both users and search engines that the content is not available. It is important to fix 404 errors as soon as possible to avoid losing SEO value and providing a poor user experience. #### 503 Service Unavailable This status code indicates that the server is temporarily unavailable due to maintenance or overload. This can be problematic for SEO because search engines may interpret this as a sign of an unreliable website. It is important to fix 503 errors as soon as possible to avoid losing SEO value and providing a poor user experience. In general, it is important to monitor and fix any HTTP status codes that could negatively impact user experience or search engine indexing.
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