🕷️ Crawler Inspector

URL Lookup

Direct Parameter Lookup

Raw Queries and Responses

1. Shard Calculation

Query:

Response:

Calculated Shard: 172 (from laksa128)

2. Crawled Status Check

Query:

curl -X POST \
  'http://laksa172.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, meta_canonical AS meta_canonical, ml_categories_json AS ml_categories_json, ml_types_json AS ml_types_json, ml_intent_types_json AS ml_intent_types_json, meta_language AS meta_language, attrs_author AS attrs_author, ifNull(toUnixTimestamp(attrs_publish_time), 0) AS attrs_publish_time, ifNull(toUnixTimestamp(attrs_original_publish_time), 0) AS attrs_original_publish_time, ifNull(attrs_is_republished, 0) AS attrs_is_republished, ifNull(attrs_nr_words, 0) AS attrs_nr_words, ifNull(attrs_boilerpipe_nr_words, 0) AS attrs_boilerpipe_nr_words, ifNull(body_ext_links_number, 0) AS body_ext_links_number, ifNull(body_int_links_number, 0) AS body_int_links_number, ifNull(meta_nofollow, 0) AS meta_nofollow, ifNull(meta_noarchive, 0) AS meta_noarchive, ifNull(props_was_rendered, 0) AS props_was_rendered, ifNull(src_redirect, \'\') AS src_redirect, ifNull(download_time_msec, 0) AS download_time_msec, ifNull(download_ttfb_msec, 0) AS download_ttfb_msec, ifNull(download_size, 0) AS download_size FROM crawler3.page_info_local FINAL PREWHERE int_partition_id = 22 AND (src_root_hash, src_unparsed) IN ((getAhrefsRootHashFromUnparsed(getAhrefsUnparsedNoserviceFromURL(\'https://errorcorrectionzoo.org/c/qecc\')), getAhrefsUnparsedNoserviceFromURL(\'https://errorcorrectionzoo.org/c/qecc\'))) FORMAT JSONEachRow'

Response:

{"found_url":"https:\/\/errorcorrectionzoo.org\/c\/qecc","crawl_time":1780367364,"first_indexed_time":1638169613,"http_code":200,"src_unparsed":"org,errorcorrectionzoo!\/c\/qecc s443","src_root_hash":"13709360758981584572","history_drop_reason":null,"meta_title":"Quantum error-correcting code (QECC) | Error Correction Zoo","meta_descriptions":["Encodes quantum information in a (logical) subspace of a (physical) Hilbert space such that it is possible to recover said information from errors that act as linear maps on the physical space. The state space of a QECC is contained in the space of complex L^2-normalizable functions of some configuration space, which usually corresponds to the alphabet of a classical code."],"meta_canonical":null,"ml_categories_json":"{\"\/Computers_and_Electronics\":553,\"\/Science\":507,\"\/Science\/Computer_Science\":339,\"\/Science\/Computer_Science\/Other\":308,\"\/Computers_and_Electronics\/Programming\":247,\"\/Computers_and_Electronics\/Programming\/C_and_C++\":140}","ml_types_json":"{\"\/Article\":866,\"\/Article\/Definitions\":560}","ml_intent_types_json":"{\"Informational\":999}","meta_language":"en","attrs_author":null,"attrs_publish_time":0,"attrs_original_publish_time":1638169613,"attrs_is_republished":0,"attrs_nr_words":"2122","attrs_boilerpipe_nr_words":"1820","body_ext_links_number":70,"body_int_links_number":72,"meta_nofollow":0,"meta_noarchive":0,"props_was_rendered":1,"src_redirect":"","download_time_msec":14,"download_ttfb_msec":14,"download_size":12945}

3. Robots.txt Check

Query:

Response:

4. Spam/Ban Check

Query:

Response:

5. Seen Status Check

ℹ️ Skipped - page is already crawled

📍

LOCATION

Host 172 · Partition 22

laksa172

13709360758981584572

📄

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 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://errorcorrectionzoo.org/c/qecc

Last Crawled

2026-06-02 02:29:24 (1 day ago)

First Indexed

2021-11-29 07:06:53 (4 years ago)

HTTP Status Code

200

Content

Meta Title

Quantum error-correcting code (QECC) | Error Correction Zoo

Meta Description

Encodes quantum information in a (logical) subspace of a (physical) Hilbert space such that it is possible to recover said information from errors that act as linear maps on the physical space. The state space of a QECC is contained in the space of complex L^2-normalizable functions of some configuration space, which usually corresponds to the alphabet of a classical code.

Meta Canonical

null

Boilerpipe Text

heavy column, fetched on demand

Markdown

heavy column, fetched on demand

Readable Markdown

heavy column, fetched on demand

ML Classification

ML Categories

/Computers_and_Electronics		55.3%
/Science		50.7%
/Science/Computer_Science		33.9%
/Science/Computer_Science/Other		30.8%
/Computers_and_Electronics/Programming		24.7%
/Computers_and_Electronics/Programming/C_and_C++		14.0%

Raw JSON

{
    "/Computers_and_Electronics": 553,
    "/Science": 507,
    "/Science/Computer_Science": 339,
    "/Science/Computer_Science/Other": 308,
    "/Computers_and_Electronics/Programming": 247,
    "/Computers_and_Electronics/Programming/C_and_C++": 140
}

ML Page Types

/Article		86.6%
/Article/Definitions		56.0%

Raw JSON

{
    "/Article": 866,
    "/Article/Definitions": 560
}

ML Intent Types

Informational

99.9%

Raw JSON

{
    "Informational": 999
}

Content Metadata

Language

Author

null

Publish Time

not set

Original Publish Time

2021-11-29 07:06:53 (4 years ago)

Republished

Word Count (Total)

2,122

Word Count (Content)

1,820

Links

External Links

Internal Links

Technical SEO

Meta Nofollow

Meta Noarchive

JS Rendered

Yes

Redirect Target

null

Performance

Download Time (ms)

TTFB (ms)

Download Size (bytes)

12,945

Location

Host ID

172 (laksa172)

Partition ID

Root Hash

13709360758981584572

Unparsed URL

org,errorcorrectionzoo!/c/qecc s443