🕷️ Crawler Inspector

URL Lookup

Direct Parameter Lookup

Raw Queries and Responses

1. Shard Calculation

Query:

Response:

Calculated Shard: 94 (from laksa158)

2. Crawled Status Check

Query:

curl -X POST \
  'http://laksa094.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 = 54 AND (src_root_hash, src_unparsed) IN ((getAhrefsRootHashFromUnparsed(getAhrefsUnparsedNoserviceFromURL(\'https://online.stat.psu.edu/stat505/lesson/4/4.5\')), getAhrefsUnparsedNoserviceFromURL(\'https://online.stat.psu.edu/stat505/lesson/4/4.5\'))) FORMAT JSONEachRow'

Response:

{"found_url":"https:\/\/online.stat.psu.edu\/stat505\/lesson\/4\/4.5","crawl_time":1775032093,"first_indexed_time":1591902430,"http_code":200,"src_unparsed":"edu,psu!stat,online,\/stat505\/lesson\/4\/4.5 s443","src_root_hash":"16520191723648810894","history_drop_reason":null,"meta_title":"4.5 - Eigenvalues and Eigenvectors | STAT 505","meta_descriptions":[],"meta_canonical":null,"ml_categories_json":"{\"\/Science\":530,\"\/Science\/Mathematics\":529,\"\/Science\/Mathematics\/Other\":431,\"\/Jobs_and_Education\":324,\"\/Jobs_and_Education\/Education\":324,\"\/Jobs_and_Education\/Education\/Colleges_and_Universities\":150}","ml_types_json":"{\"\/Article\":920,\"\/Article\/Tutorial_or_Guide\":902}","ml_intent_types_json":"{\"Informational\":999}","meta_language":"en","attrs_author":null,"attrs_publish_time":0,"attrs_original_publish_time":1591902430,"attrs_is_republished":0,"attrs_nr_words":"2472","attrs_boilerpipe_nr_words":"919","body_ext_links_number":3,"body_int_links_number":157,"meta_nofollow":0,"meta_noarchive":0,"props_was_rendered":1,"src_redirect":"","download_time_msec":1079,"download_ttfb_msec":599,"download_size":98724}

3. Robots.txt Check

Query:

Response:

4. Spam/Ban Check

Query:

Response:

5. Seen Status Check

ℹ️ Skipped - page is already crawled

📍

LOCATION

Host 94 · Partition 54

laksa094

16520191723648810894

📄

INDEXABLE

✅

CRAWLED

2 months 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`	2.1 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://online.stat.psu.edu/stat505/lesson/4/4.5

Last Crawled

2026-04-01 08:28:13 (2 months ago)

First Indexed

2020-06-11 19:07:10 (5 years ago)

HTTP Status Code

200

Content

Meta Title

4.5 - Eigenvalues and Eigenvectors | STAT 505

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		53.0%
/Science/Mathematics		52.9%
/Science/Mathematics/Other		43.1%
/Jobs_and_Education		32.4%
/Jobs_and_Education/Education		32.4%
/Jobs_and_Education/Education/Colleges_and_Universities		15.0%

Raw JSON

{
    "/Science": 530,
    "/Science/Mathematics": 529,
    "/Science/Mathematics/Other": 431,
    "/Jobs_and_Education": 324,
    "/Jobs_and_Education/Education": 324,
    "/Jobs_and_Education/Education/Colleges_and_Universities": 150
}

ML Page Types

/Article		92.0%
/Article/Tutorial_or_Guide		90.2%

Raw JSON

{
    "/Article": 920,
    "/Article/Tutorial_or_Guide": 902
}

ML Intent Types

Informational

99.9%

Raw JSON

{
    "Informational": 999
}

Content Metadata

Language

Author

null

Publish Time

not set

Original Publish Time

2020-06-11 19:07:10 (5 years ago)

Republished

Word Count (Total)

2,472

Word Count (Content)

919

Links

External Links

Internal Links

157

Technical SEO

Meta Nofollow

Meta Noarchive

JS Rendered

Yes

Redirect Target

null

Performance

Download Time (ms)

1,079

TTFB (ms)

599

Download Size (bytes)

98,724

Location

Host ID

94 (laksa094)

Partition ID

Root Hash

16520191723648810894

Unparsed URL

edu,psu!stat,online,/stat505/lesson/4/4.5 s443