Crawler Inspector

1. Shard Calculation

Query:

Response:

Calculated Shard: 147 (from laksa016)

2. Crawled Status Check

Query:

curl -X POST \
  'http://laksa147.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 = 12 AND (src_root_hash, src_unparsed) IN ((getAhrefsRootHashFromUnparsed(getAhrefsUnparsedNoserviceFromURL(\'https://nhigham.com/2016/01/21/the-most-beautiful-equations-in-applied-mathematics/\')), getAhrefsUnparsedNoserviceFromURL(\'https://nhigham.com/2016/01/21/the-most-beautiful-equations-in-applied-mathematics/\'))) FORMAT JSONEachRow'

Filter	Status	Condition	Details
HTTP status	FAIL	`download_http_code = 200`	HTTP 403
Age cutoff	FAIL	`download_stamp > now() - 6 MONTH`	6.9 months ago
History drop	FAIL	`isNull(history_drop_reason)`	oldunavailable
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

Property	Value
URL	https://nhigham.com/2016/01/21/the-most-beautiful-equations-in-applied-mathematics/
Last Crawled	2025-11-09 05:09:44 (6 months ago)
First Indexed	2024-04-23 22:06:54 (2 years ago)
HTTP Status Code	403
Content
Meta Title	null
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	null
ML Page Types	null
ML Intent Types	null
Content Metadata
Language	null
Author	null
Publish Time	not set
Original Publish Time	2016-01-21 00:00:00 (10 years ago)
Republished	No
Word Count (Total)	0
Word Count (Content)	0
Links
External Links	0
Internal Links	0
Technical SEO
Meta Nofollow	No
Meta Noarchive	No
JS Rendered	No
Redirect Target	null
Performance
Download Time (ms)	113
TTFB (ms)	113
Download Size (bytes)	0
Location
Host ID	147 (laksa147)
Partition ID	12
Root Hash	6726080544100862547
Unparsed URL	com,nhigham!/2016/01/21/the-most-beautiful-equations-in-applied-mathematics/ s443

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1. Shard Calculation

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2. Crawled Status Check

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5. Seen Status Check

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