🕷️ Crawler Inspector

URL Lookup

Direct Parameter Lookup

Raw Queries and Responses

1. Shard Calculation

Query:

Response:

Calculated Shard: 115 (from laksa163)

2. Crawled Status Check

Query:

curl -X POST \
  'http://laksa115.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 = 83 AND (src_root_hash, src_unparsed) IN ((getAhrefsRootHashFromUnparsed(getAhrefsUnparsedNoserviceFromURL(\'https://www.probabilitycourse.com/\')), getAhrefsUnparsedNoserviceFromURL(\'https://www.probabilitycourse.com/\'))) FORMAT JSONEachRow'

Response:

{"found_url":"https:\/\/www.probabilitycourse.com\/","crawl_time":1780321514,"first_indexed_time":1469553798,"http_code":200,"src_unparsed":"com,probabilitycourse!www,\/ s443","src_root_hash":"8531609719846996715","history_drop_reason":null,"meta_title":"Probability, Statistics & Random Processes | Free Textbook | Course","meta_descriptions":[],"meta_canonical":null,"ml_categories_json":"{\"\/Science\":769,\"\/Science\/Mathematics\":750,\"\/Science\/Mathematics\/Statistics\":740,\"\/Jobs_and_Education\":308,\"\/Jobs_and_Education\/Education\":308,\"\/Jobs_and_Education\/Education\/Colleges_and_Universities\":181}","ml_types_json":"{\"\/Document\":610,\"\/Document\/Ebook\":592}","ml_intent_types_json":"{\"Informational\":990}","meta_language":"en","attrs_author":null,"attrs_publish_time":0,"attrs_original_publish_time":1469553798,"attrs_is_republished":0,"attrs_nr_words":"1437","attrs_boilerpipe_nr_words":"439","body_ext_links_number":13,"body_int_links_number":197,"meta_nofollow":0,"meta_noarchive":0,"props_was_rendered":1,"src_redirect":"","download_time_msec":140,"download_ttfb_msec":139,"download_size":4423}

3. Robots.txt Check

Query:

Response:

4. Spam/Ban Check

Query:

Response:

5. Seen Status Check

ℹ️ Skipped - page is already crawled

📍

LOCATION

Host 115 · Partition 83

laksa115

8531609719846996715

📄

INDEXABLE

✅

CRAWLED

2 days 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.probabilitycourse.com/

Last Crawled

2026-06-01 13:45:14 (2 days ago)

First Indexed

2016-07-26 17:23:18 (9 years ago)

HTTP Status Code

200

Content

Meta Title

Probability, Statistics & Random Processes | Free Textbook | Course

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		76.9%
/Science/Mathematics		75.0%
/Science/Mathematics/Statistics		74.0%
/Jobs_and_Education		30.8%
/Jobs_and_Education/Education		30.8%
/Jobs_and_Education/Education/Colleges_and_Universities		18.1%

Raw JSON

{
    "/Science": 769,
    "/Science/Mathematics": 750,
    "/Science/Mathematics/Statistics": 740,
    "/Jobs_and_Education": 308,
    "/Jobs_and_Education/Education": 308,
    "/Jobs_and_Education/Education/Colleges_and_Universities": 181
}

ML Page Types

/Document		61.0%
/Document/Ebook		59.2%

Raw JSON

{
    "/Document": 610,
    "/Document/Ebook": 592
}

ML Intent Types

Informational

99.0%

Raw JSON

{
    "Informational": 990
}

Content Metadata

Language

Author

null

Publish Time

not set

Original Publish Time

2016-07-26 17:23:18 (9 years ago)

Republished

Word Count (Total)

1,437

Word Count (Content)

439

Links

External Links

Internal Links

197

Technical SEO

Meta Nofollow

Meta Noarchive

JS Rendered

Yes

Redirect Target

null

Performance

Download Time (ms)

140

TTFB (ms)

139

Download Size (bytes)

4,423

Location

Host ID

115 (laksa115)

Partition ID

Root Hash

8531609719846996715

Unparsed URL

com,probabilitycourse!www,/ s443