🕷️ Crawler Inspector

URL Lookup

Direct Parameter Lookup

Raw Queries and Responses

1. Shard Calculation

Query:

Response:

Calculated Shard: 184 (from laksa095)

2. Crawled Status Check

Query:

curl -X POST \
  'http://laksa184.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 = 18 AND (src_root_hash, src_unparsed) IN ((getAhrefsRootHashFromUnparsed(getAhrefsUnparsedNoserviceFromURL(\'https://reference.wolfram.com/language/ref/KarhunenLoeveDecomposition.html\')), getAhrefsUnparsedNoserviceFromURL(\'https://reference.wolfram.com/language/ref/KarhunenLoeveDecomposition.html\'))) FORMAT JSONEachRow'

Response:

{"found_url":"https:\/\/reference.wolfram.com\/language\/ref\/KarhunenLoeveDecomposition.html","crawl_time":1776105608,"first_indexed_time":1411351680,"http_code":200,"src_unparsed":"com,wolfram!reference,\/language\/ref\/KarhunenLoeveDecomposition.html s443","src_root_hash":"3744487911316863784","history_drop_reason":null,"meta_title":"KarhunenLoeveDecomposition: Karhunen-Loeve transform—Wolfram Documentation","meta_descriptions":["KarhunenLoeveDecomposition[{a1, a2, ...}] gives the Karhunen\\[Dash]Loeve transform {{b1, b2, ...}, m} of the numerical arrays {a1, a2, ...}, where m . ai == bi. KarhunenLoeveDecomposition[{b1, b2, ...}, m] uses the inverse of the matrix m for transforming bi to ai."],"meta_canonical":null,"ml_categories_json":"{\"\/Computers_and_Electronics\":903,\"\/Computers_and_Electronics\/Software\":445,\"\/Computers_and_Electronics\/Software\/Software_Utilities\":209,\"\/Science\":148,\"\/Science\/Computer_Science\":107}","ml_types_json":"{\"\/Document\":722,\"\/Document\/Manual\":652}","ml_intent_types_json":"{\"Informational\":999}","meta_language":"en","attrs_author":null,"attrs_publish_time":0,"attrs_original_publish_time":1411351680,"attrs_is_republished":0,"attrs_nr_words":"2169","attrs_boilerpipe_nr_words":"695","body_ext_links_number":63,"body_int_links_number":207,"meta_nofollow":0,"meta_noarchive":0,"props_was_rendered":1,"src_redirect":"","download_time_msec":183,"download_ttfb_msec":94,"download_size":199899}

3. Robots.txt Check

Query:

Response:

4. Spam/Ban Check

Query:

Response:

5. Seen Status Check

ℹ️ Skipped - page is already crawled

📍

LOCATION

Host 184 · Partition 18

laksa184

3744487911316863784

📄

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`	1.7 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://reference.wolfram.com/language/ref/KarhunenLoeveDecomposition.html

Last Crawled

2026-04-13 18:40:08 (1 month ago)

First Indexed

2014-09-22 02:08:00 (11 years ago)

HTTP Status Code

200

Content

Meta Title

KarhunenLoeveDecomposition: Karhunen-Loeve transform—Wolfram Documentation

Meta Description

KarhunenLoeveDecomposition[{a1, a2, ...}] gives the Karhunen\[Dash]Loeve transform {{b1, b2, ...}, m} of the numerical arrays {a1, a2, ...}, where m . ai == bi. KarhunenLoeveDecomposition[{b1, b2, ...}, m] uses the inverse of the matrix m for transforming bi to ai.

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		90.3%
/Computers_and_Electronics/Software		44.5%
/Computers_and_Electronics/Software/Software_Utilities		20.9%
/Science		14.8%
/Science/Computer_Science		10.7%

Raw JSON

{
    "/Computers_and_Electronics": 903,
    "/Computers_and_Electronics/Software": 445,
    "/Computers_and_Electronics/Software/Software_Utilities": 209,
    "/Science": 148,
    "/Science/Computer_Science": 107
}

ML Page Types

/Document		72.2%
/Document/Manual		65.2%

Raw JSON

{
    "/Document": 722,
    "/Document/Manual": 652
}

ML Intent Types

Informational

99.9%

Raw JSON

{
    "Informational": 999
}

Content Metadata

Language

Author

null

Publish Time

not set

Original Publish Time

2014-09-22 02:08:00 (11 years ago)

Republished

Word Count (Total)

2,169

Word Count (Content)

695

Links

External Links

Internal Links

207

Technical SEO

Meta Nofollow

Meta Noarchive

JS Rendered

Yes

Redirect Target

null

Performance

Download Time (ms)

183

TTFB (ms)

Download Size (bytes)

199,899

Location

Host ID

184 (laksa184)

Partition ID

Root Hash

3744487911316863784

Unparsed URL

com,wolfram!reference,/language/ref/KarhunenLoeveDecomposition.html s443