Crawler Inspector

1. Shard Calculation

Query:

Response:

Calculated Shard: 171 (from laksa087)

2. Crawled Status Check

Query:

curl -X POST \
  'http://laksa171.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 = 8 AND (src_root_hash, src_unparsed) IN ((getAhrefsRootHashFromUnparsed(getAhrefsUnparsedNoserviceFromURL(\'https://crows.org/stem-blog/understanding-cell-phone-technology-error-correcting-codes/\')), getAhrefsUnparsedNoserviceFromURL(\'https://crows.org/stem-blog/understanding-cell-phone-technology-error-correcting-codes/\'))) FORMAT JSONEachRow'

Response:

{"found_url":"https:\/\/crows.org\/stem-blog\/understanding-cell-phone-technology-error-correcting-codes\/","crawl_time":1779078673,"first_indexed_time":1712470658,"http_code":200,"src_unparsed":"org,crows!\/stem-blog\/understanding-cell-phone-technology-error-correcting-codes\/ s443","src_root_hash":"17928805700679961771","history_drop_reason":null,"meta_title":"Understanding Cell Phone Technology: Error Correcting Codes - Association of Old Crows","meta_descriptions":["Error correcting codes came along after Claude Shannon proved that the use of suitable codes permitted reliable information transmission across a noisy channel…"],"meta_canonical":null,"ml_categories_json":"","ml_types_json":"","ml_intent_types_json":"","meta_language":"en-us","attrs_author":null,"attrs_publish_time":1609137013,"attrs_original_publish_time":1609137013,"attrs_is_republished":0,"attrs_nr_words":"939","attrs_boilerpipe_nr_words":"678","body_ext_links_number":9,"body_int_links_number":58,"meta_nofollow":0,"meta_noarchive":0,"props_was_rendered":0,"src_redirect":"","download_time_msec":12146,"download_ttfb_msec":12044,"download_size":80688}

Filter	Status	Condition	Details
HTTP status	PASS	`download_http_code = 200`	HTTP 200
Age cutoff	PASS	`download_stamp > now() - 6 MONTH`	0.6 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

Property	Value
URL	https://crows.org/stem-blog/understanding-cell-phone-technology-error-correcting-codes/
Last Crawled	2026-05-18 04:31:13 (16 days ago)
First Indexed	2024-04-07 06:17:38 (2 years ago)
HTTP Status Code	200
Content
Meta Title	Understanding Cell Phone Technology: Error Correcting Codes - Association of Old Crows
Meta Description	Error correcting codes came along after Claude Shannon proved that the use of suitable codes permitted reliable information transmission across a noisy channel…
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	en-us
Author	null
Publish Time	2020-12-28 06:30:13 (5 years ago)
Original Publish Time	2020-12-28 06:30:13 (5 years ago)
Republished	No
Word Count (Total)	939
Word Count (Content)	678
Links
External Links	9
Internal Links	58
Technical SEO
Meta Nofollow	No
Meta Noarchive	No
JS Rendered	No
Redirect Target	null
Performance
Download Time (ms)	12,146
TTFB (ms)	12,044
Download Size (bytes)	80,688
Location
Host ID	171 (laksa171)
Partition ID	8
Root Hash	17928805700679961771
Unparsed URL	org,crows!/stem-blog/understanding-cell-phone-technology-error-correcting-codes/ s443

🕷️ Crawler Inspector

URL Lookup

Direct Parameter Lookup

1. Shard Calculation

Query:

Response:

2. Crawled Status Check

Query:

Response:

3. Robots.txt Check

Query:

Response:

4. Spam/Ban Check

Query:

Response:

5. Seen Status Check

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