Crawler Inspector

1. Shard Calculation

Query:

Response:

Calculated Shard: 195 (from laksa027)

2. Crawled Status Check

Query:

curl -X POST \
  'http://laksa195.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, attrs_boilerpipe_text AS attrs_boilerpipe_text, attrs_markdown AS attrs_markdown, attrs_readable_markdown AS attrs_readable_markdown, meta_canonical AS meta_canonical FROM crawler3.page_info_local FINAL PREWHERE (src_root_hash, src_unparsed) IN ((getAhrefsRootHashFromUnparsed(getAhrefsUnparsedNoserviceFromURL(\'https://www.wikiwand.com/en/articles/Error_correction_code\')), getAhrefsUnparsedNoserviceFromURL(\'https://www.wikiwand.com/en/articles/Error_correction_code\'))) FORMAT JSONEachRow'

Response:

{"found_url":"https:\/\/www.wikiwand.com\/en\/articles\/Error_correction_code","crawl_time":1769938883,"first_indexed_time":1726552801,"http_code":200,"src_unparsed":"com,wikiwand!www,\/en\/articles\/Error_correction_code s443","src_root_hash":"4597496577028769195","history_drop_reason":null,"meta_title":"Error correction code - Wikiwand","meta_descriptions":[],"attrs_boilerpipe_text":"English\nTop Qs\nTimeline\nChat\nPerspective\nTop Qs\nTimeline\nChat\nPerspective\nAll\nArticles\nDictionary\nQuotes\nMap\nRemove ads\nLoading article...\nRemove ads","attrs_markdown":"English\n\n[Sign in](https:\/\/www.wikiwand.com\/auth\/signin)\n\nTop Qs\n\nTimeline\n\nChat\n\nPerspective\n\nTop Qs\n\nTimeline\n\nChat\n\nPerspective\n\n[All](https:\/\/www.wikiwand.com\/en\/articles\/Error_correction_code)\n\n[Articles](https:\/\/www.wikiwand.com\/en\/articles\/Error_correction_code)\n\n[Dictionary](https:\/\/www.wikiwand.com\/en\/articles\/Error_correction_code)\n\n[Quotes](https:\/\/www.wikiwand.com\/en\/articles\/Error_correction_code)\n\n[Map](https:\/\/www.wikiwand.com\/en\/articles\/Error_correction_code)\n\nRemove ads\n\nRemove ads\n\nLoading article...\n\nWikiwand **❤️** Wikipedia\n\n[Privacy](https:\/\/www.wikiwand.com\/legal\/privacy)[Terms](https:\/\/www.wikiwand.com\/legal\/terms)\n\nRemove ads","attrs_readable_markdown":"English\n\nTop Qs\n\nTimeline\n\nChat\n\nPerspective\n\nTop Qs\n\nTimeline\n\nChat\n\nPerspective\n\n[All](https:\/\/www.wikiwand.com\/en\/articles\/Error_correction_code)\n\n[Articles](https:\/\/www.wikiwand.com\/en\/articles\/Error_correction_code)\n\n[Dictionary](https:\/\/www.wikiwand.com\/en\/articles\/Error_correction_code)\n\n[Quotes](https:\/\/www.wikiwand.com\/en\/articles\/Error_correction_code)\n\n[Map](https:\/\/www.wikiwand.com\/en\/articles\/Error_correction_code)\n\nRemove ads\n\nLoading article...\n\nRemove ads","meta_canonical":null}

Filter	Status	Condition	Details
HTTP status	PASS	`download_http_code = 200`	HTTP 200
Age cutoff	PASS	`download_stamp > now() - 6 MONTH`	2.2 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://www.wikiwand.com/en/articles/Error_correction_code
Last Crawled	2026-02-01 09:41:23 (2 months ago)
First Indexed	2024-09-17 06:00:01 (1 year ago)
HTTP Status Code	200
Meta Title	Error correction code - Wikiwand
Meta Description	null
Meta Canonical	null
Boilerpipe Text	English Top Qs Timeline Chat Perspective Top Qs Timeline Chat Perspective All Articles Dictionary Quotes Map Remove ads Loading article... Remove ads
Markdown	English [Sign in](https://www.wikiwand.com/auth/signin) Top Qs Timeline Chat Perspective Top Qs Timeline Chat Perspective [All](https://www.wikiwand.com/en/articles/Error_correction_code) [Articles](https://www.wikiwand.com/en/articles/Error_correction_code) [Dictionary](https://www.wikiwand.com/en/articles/Error_correction_code) [Quotes](https://www.wikiwand.com/en/articles/Error_correction_code) [Map](https://www.wikiwand.com/en/articles/Error_correction_code) Remove ads Remove ads Loading article... Wikiwand ❤️ Wikipedia [Privacy](https://www.wikiwand.com/legal/privacy)[Terms](https://www.wikiwand.com/legal/terms) Remove ads
Readable Markdown	English Top Qs Timeline Chat Perspective Top Qs Timeline Chat Perspective [All](https://www.wikiwand.com/en/articles/Error_correction_code) [Articles](https://www.wikiwand.com/en/articles/Error_correction_code) [Dictionary](https://www.wikiwand.com/en/articles/Error_correction_code) [Quotes](https://www.wikiwand.com/en/articles/Error_correction_code) [Map](https://www.wikiwand.com/en/articles/Error_correction_code) Remove ads Loading article... Remove ads
Shard	195 (laksa)
Root Hash	4597496577028769195
Unparsed URL	com,wikiwand!www,/en/articles/Error_correction_code s443

🕷️ Crawler Inspector

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1. Shard Calculation

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2. Crawled Status Check

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3. Robots.txt Check

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4. Spam/Ban Check

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5. Seen Status Check

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