🕷️ Crawler Inspector

URL Lookup

Direct Parameter Lookup

Raw Queries and Responses

1. Shard Calculation

Query:

Response:

Calculated Shard: 18 (from laksa150)

2. Crawled Status Check

Query:

curl -X POST \
  'http://laksa018.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 = 1 AND (src_root_hash, src_unparsed) IN ((getAhrefsRootHashFromUnparsed(getAhrefsUnparsedNoserviceFromURL(\'https://math.stackexchange.com/questions/1520832/real-life-examples-for-eigenvalues-eigenvectors\')), getAhrefsUnparsedNoserviceFromURL(\'https://math.stackexchange.com/questions/1520832/real-life-examples-for-eigenvalues-eigenvectors\'))) FORMAT JSONEachRow'

Response:

{"found_url":"https:\/\/math.stackexchange.com\/questions\/1520832\/real-life-examples-for-eigenvalues-eigenvectors","crawl_time":1775778292,"first_indexed_time":1493331786,"http_code":200,"src_unparsed":"com,stackexchange!math,\/questions\/1520832\/real-life-examples-for-eigenvalues-eigenvectors s443","src_root_hash":"8045678284012640218","history_drop_reason":null,"meta_title":"Real life examples for eigenvalues \/ eigenvectors - Mathematics Stack Exchange","meta_descriptions":[],"meta_canonical":null,"ml_categories_json":"{\"\/Science\":746,\"\/Science\/Mathematics\":589,\"\/Science\/Mathematics\/Other\":499,\"\/Computers_and_Electronics\":292,\"\/Computers_and_Electronics\/Software\":244,\"\/Computers_and_Electronics\/Software\/Educational_Software\":214}","ml_types_json":"{\"\/Article\":923,\"\/Article\/Tutorial_or_Guide\":569}","ml_intent_types_json":"{\"Informational\":999}","meta_language":"en","attrs_author":null,"attrs_publish_time":1447079439,"attrs_original_publish_time":1447079439,"attrs_is_republished":0,"attrs_nr_words":"4108","attrs_boilerpipe_nr_words":"612","body_ext_links_number":52,"body_int_links_number":121,"meta_nofollow":0,"meta_noarchive":0,"props_was_rendered":1,"src_redirect":"","download_time_msec":148,"download_ttfb_msec":122,"download_size":50009}

3. Robots.txt Check

Query:

Response:

4. Spam/Ban Check

Query:

Response:

5. Seen Status Check

ℹ️ Skipped - page is already crawled

📍

LOCATION

Host 18 · Partition 1

laksa018

8045678284012640218

📄

INDEXABLE

✅

CRAWLED

1 month 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`	1.8 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://math.stackexchange.com/questions/1520832/real-life-examples-for-eigenvalues-eigenvectors

Last Crawled

2026-04-09 23:44:52 (1 month ago)

First Indexed

2017-04-27 22:23:06 (9 years ago)

HTTP Status Code

200

Content

Meta Title

Real life examples for eigenvalues / eigenvectors - Mathematics Stack Exchange

Meta Description

null

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

/Science		74.6%
/Science/Mathematics		58.9%
/Science/Mathematics/Other		49.9%
/Computers_and_Electronics		29.2%
/Computers_and_Electronics/Software		24.4%
/Computers_and_Electronics/Software/Educational_Software		21.4%

Raw JSON

{
    "/Science": 746,
    "/Science/Mathematics": 589,
    "/Science/Mathematics/Other": 499,
    "/Computers_and_Electronics": 292,
    "/Computers_and_Electronics/Software": 244,
    "/Computers_and_Electronics/Software/Educational_Software": 214
}

ML Page Types

/Article		92.3%
/Article/Tutorial_or_Guide		56.9%

Raw JSON

{
    "/Article": 923,
    "/Article/Tutorial_or_Guide": 569
}

ML Intent Types

Informational

99.9%

Raw JSON

{
    "Informational": 999
}

Content Metadata

Language

Author

null

Publish Time

2015-11-09 14:30:39 (10 years ago)

Original Publish Time

2015-11-09 14:30:39 (10 years ago)

Republished

Word Count (Total)

4,108

Word Count (Content)

612

Links

External Links

Internal Links

121

Technical SEO

Meta Nofollow

Meta Noarchive

JS Rendered

Yes

Redirect Target

null

Performance

Download Time (ms)

148

TTFB (ms)

122

Download Size (bytes)

50,009

Location

Host ID

18 (laksa018)

Partition ID

Root Hash

8045678284012640218

Unparsed URL

com,stackexchange!math,/questions/1520832/real-life-examples-for-eigenvalues-eigenvectors s443