🕷️ Crawler Inspector

URL Lookup

Direct Parameter Lookup

Raw Queries and Responses

1. Shard Calculation

Query:

Response:

Calculated Shard: 129 (from laksa094)

2. Crawled Status Check

Query:

curl -X POST \
  'http://laksa129.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 = 63 AND (src_root_hash, src_unparsed) IN ((getAhrefsRootHashFromUnparsed(getAhrefsUnparsedNoserviceFromURL(\'https://www.ncbi.nlm.nih.gov/books/NBK253923/\')), getAhrefsUnparsedNoserviceFromURL(\'https://www.ncbi.nlm.nih.gov/books/NBK253923/\'))) FORMAT JSONEachRow'

Response:

{"found_url":"https:\/\/www.ncbi.nlm.nih.gov\/books\/NBK253923\/","crawl_time":1747296597,"first_indexed_time":1544703318,"http_code":200,"src_unparsed":"gov,nih!nlm,ncbi,www,\/books\/NBK253923\/ s443","src_root_hash":"7295144728021232729","history_drop_reason":"tooold","meta_title":"Summary - Lessons Learned from the Fukushima Nuclear Accident for Improving Safety of U.S. Nuclear Plants - NCBI Bookshelf","meta_descriptions":["The March 11, 2011, Great East Japan Earthquake and tsunami sparked a humanitarian disaster in northeastern Japan and initiated a severe nuclear accident at the Fukushima Daiichi nuclear plant. Three of the six reactors at the plant sustained severe core damage and released hydrogen and radioactive materials. Explosion of the released hydrogen damaged three reactor buildings and impeded onsite emergency response efforts."],"meta_canonical":null,"ml_categories_json":"{\"\/Science\":905,\"\/Science\/Physics\":721,\"\/Law_and_Government\":383,\"\/Law_and_Government\/Legal\":245,\"\/Law_and_Government\/Legal\/Other\":114}","ml_types_json":"{\"\/Article\":664,\"\/Article\/Study_or_Research_Findings\":421}","ml_intent_types_json":"{\"Informational\":999}","meta_language":"en","attrs_author":null,"attrs_publish_time":0,"attrs_original_publish_time":1544703318,"attrs_is_republished":0,"attrs_nr_words":"4204","attrs_boilerpipe_nr_words":"3508","body_ext_links_number":18,"body_int_links_number":44,"meta_nofollow":1,"meta_noarchive":1,"props_was_rendered":1,"src_redirect":"","download_time_msec":553,"download_ttfb_msec":552,"download_size":20892}

3. Robots.txt Check

Query:

Response:

4. Spam/Ban Check

Query:

Response:

5. Seen Status Check

ℹ️ Skipped - page is already crawled

📍

LOCATION

Host 129 · Partition 63

laksa129

7295144728021232729

🚫

NOT INDEXABLE

✅

CRAWLED

1 year ago

🤖

ROBOTS ALLOWED

Page Info Filters

Filter	Status	Condition	Details
HTTP status	PASS	`download_http_code = 200`	HTTP 200
Age cutoff	FAIL	`download_stamp > now() - 6 MONTH`	12.8 months ago
History drop	FAIL	`isNull(history_drop_reason)`	tooold
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.ncbi.nlm.nih.gov/books/NBK253923/

Last Crawled

2025-05-15 08:09:57 (1 year ago)

First Indexed

2018-12-13 12:15:18 (7 years ago)

HTTP Status Code

200

Content

Meta Title

Summary - Lessons Learned from the Fukushima Nuclear Accident for Improving Safety of U.S. Nuclear Plants - NCBI Bookshelf

Meta Description

The March 11, 2011, Great East Japan Earthquake and tsunami sparked a humanitarian disaster in northeastern Japan and initiated a severe nuclear accident at the Fukushima Daiichi nuclear plant. Three of the six reactors at the plant sustained severe core damage and released hydrogen and radioactive materials. Explosion of the released hydrogen damaged three reactor buildings and impeded onsite emergency response efforts.

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		90.5%
/Science/Physics		72.1%
/Law_and_Government		38.3%
/Law_and_Government/Legal		24.5%
/Law_and_Government/Legal/Other		11.4%

Raw JSON

{
    "/Science": 905,
    "/Science/Physics": 721,
    "/Law_and_Government": 383,
    "/Law_and_Government/Legal": 245,
    "/Law_and_Government/Legal/Other": 114
}

ML Page Types

/Article		66.4%
/Article/Study_or_Research_Findings		42.1%

Raw JSON

{
    "/Article": 664,
    "/Article/Study_or_Research_Findings": 421
}

ML Intent Types

Informational

99.9%

Raw JSON

{
    "Informational": 999
}

Content Metadata

Language

Author

null

Publish Time

not set

Original Publish Time

2018-12-13 12:15:18 (7 years ago)

Republished

Word Count (Total)

4,204

Word Count (Content)

3,508

Links

External Links

Internal Links

Technical SEO

Meta Nofollow

Yes

Meta Noarchive

Yes

JS Rendered

Yes

Redirect Target

null

Performance

Download Time (ms)

553

TTFB (ms)

552

Download Size (bytes)

20,892

Location

Host ID

129 (laksa129)

Partition ID

Root Hash

7295144728021232729

Unparsed URL

gov,nih!nlm,ncbi,www,/books/NBK253923/ s443