🕷️ Crawler Inspector

URL Lookup

Direct Parameter Lookup

Raw Queries and Responses

1. Shard Calculation

Query:

Response:

Calculated Shard: 39 (from laksa111)

2. Crawled Status Check

Query:

curl -X POST \
  'http://laksa039.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 = 7 AND (src_root_hash, src_unparsed) IN ((getAhrefsRootHashFromUnparsed(getAhrefsUnparsedNoserviceFromURL(\'https://bookdown.org/danielcavey27/lecture_notes/states-recurrence-and-periodicity.html\')), getAhrefsUnparsedNoserviceFromURL(\'https://bookdown.org/danielcavey27/lecture_notes/states-recurrence-and-periodicity.html\'))) FORMAT JSONEachRow'

Response:

{"found_url":"https:\/\/bookdown.org\/danielcavey27\/lecture_notes\/states-recurrence-and-periodicity.html","crawl_time":1778582825,"first_indexed_time":1676877812,"http_code":200,"src_unparsed":"org,bookdown!\/danielcavey27\/lecture_notes\/states-recurrence-and-periodicity.html s443","src_root_hash":"3646282709075601439","history_drop_reason":null,"meta_title":"Chapter 9 States, Recurrence and Periodicity | Lecture-Notes.knit","meta_descriptions":["Lecture notes for module DATA2002: Probability and Time Series."],"meta_canonical":null,"ml_categories_json":"{\"\/Science\":635,\"\/Science\/Mathematics\":623,\"\/Science\/Mathematics\/Statistics\":583,\"\/Jobs_and_Education\":159,\"\/Jobs_and_Education\/Education\":158,\"\/Jobs_and_Education\/Education\/Colleges_and_Universities\":116}","ml_types_json":"{\"\/Document\":509,\"\/Document\/Ebook\":309}","ml_intent_types_json":"{\"Informational\":998}","meta_language":null,"attrs_author":null,"attrs_publish_time":0,"attrs_original_publish_time":1676877812,"attrs_is_republished":0,"attrs_nr_words":"2627","attrs_boilerpipe_nr_words":"2416","body_ext_links_number":4,"body_int_links_number":13,"meta_nofollow":0,"meta_noarchive":0,"props_was_rendered":0,"src_redirect":"","download_time_msec":349,"download_ttfb_msec":268,"download_size":46413}

3. Robots.txt Check

Query:

Response:

4. Spam/Ban Check

Query:

Response:

5. Seen Status Check

ℹ️ Skipped - page is already crawled

📍

LOCATION

Host 39 · Partition 7

laksa039

3646282709075601439

📄

INDEXABLE

✅

CRAWLED

22 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`	0.7 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://bookdown.org/danielcavey27/lecture_notes/states-recurrence-and-periodicity.html

Last Crawled

2026-05-12 10:47:05 (22 days ago)

First Indexed

2023-02-20 07:23:32 (3 years ago)

HTTP Status Code

200

Content

Meta Title

Chapter 9 States, Recurrence and Periodicity | Lecture-Notes.knit

Meta Description

Lecture notes for module DATA2002: Probability and Time Series.

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		63.5%
/Science/Mathematics		62.3%
/Science/Mathematics/Statistics		58.3%
/Jobs_and_Education		15.9%
/Jobs_and_Education/Education		15.8%
/Jobs_and_Education/Education/Colleges_and_Universities		11.6%

Raw JSON

{
    "/Science": 635,
    "/Science/Mathematics": 623,
    "/Science/Mathematics/Statistics": 583,
    "/Jobs_and_Education": 159,
    "/Jobs_and_Education/Education": 158,
    "/Jobs_and_Education/Education/Colleges_and_Universities": 116
}

ML Page Types

/Document		50.9%
/Document/Ebook		30.9%

Raw JSON

{
    "/Document": 509,
    "/Document/Ebook": 309
}

ML Intent Types

Informational

99.8%

Raw JSON

{
    "Informational": 998
}

Content Metadata

Language

null

Author

null

Publish Time

not set

Original Publish Time

2023-02-20 07:23:32 (3 years ago)

Republished

Word Count (Total)

2,627

Word Count (Content)

2,416

Links

External Links

Internal Links

Technical SEO

Meta Nofollow

Meta Noarchive

JS Rendered

Redirect Target

null

Performance

Download Time (ms)

349

TTFB (ms)

268

Download Size (bytes)

46,413

Location

Host ID

39 (laksa039)

Partition ID

Root Hash

3646282709075601439

Unparsed URL

org,bookdown!/danielcavey27/lecture_notes/states-recurrence-and-periodicity.html s443