Crawler Inspector

1. Shard Calculation

Query:

Response:

Calculated Shard: 77 (from laksa034)

2. Crawled Status Check

Query:

curl -X POST \
  'http://laksa077.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 = 31 AND (src_root_hash, src_unparsed) IN ((getAhrefsRootHashFromUnparsed(getAhrefsUnparsedNoserviceFromURL(\'https://medium.com/@365daysofcomputer/47-error-detecting-and-correcting-codes-590431271137\')), getAhrefsUnparsedNoserviceFromURL(\'https://medium.com/@365daysofcomputer/47-error-detecting-and-correcting-codes-590431271137\'))) FORMAT JSONEachRow'

Response:

{"found_url":"https:\/\/medium.com\/@365daysofcomputer\/47-error-detecting-and-correcting-codes-590431271137","crawl_time":1757651198,"first_indexed_time":0,"http_code":200,"src_unparsed":"com,medium!\/@365daysofcomputer\/47-error-detecting-and-correcting-codes-590431271137 s443","src_root_hash":"13179037029838926277","history_drop_reason":null,"meta_title":"47: Error-Detecting and Correcting Codes | 365 Days of Computer | Medium","meta_descriptions":["Before we can store files, let’s make sure that the hardware they are saved on doesn’t somehow break."],"meta_canonical":null,"ml_categories_json":"","ml_types_json":"","ml_intent_types_json":"","meta_language":"en","attrs_author":null,"attrs_publish_time":1741501661,"attrs_original_publish_time":1741501661,"attrs_is_republished":0,"attrs_nr_words":"1594","attrs_boilerpipe_nr_words":"1485","body_ext_links_number":3,"body_int_links_number":24,"meta_nofollow":0,"meta_noarchive":1,"props_was_rendered":0,"src_redirect":"","download_time_msec":442,"download_ttfb_msec":441,"download_size":31546}

Filter	Status	Condition	Details
HTTP status	PASS	`download_http_code = 200`	HTTP 200
Age cutoff	FAIL	`download_stamp > now() - 6 MONTH`	8.8 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://medium.com/@365daysofcomputer/47-error-detecting-and-correcting-codes-590431271137
Last Crawled	2025-09-12 04:26:38 (8 months ago)
First Indexed	not set
HTTP Status Code	200
Content
Meta Title	47: Error-Detecting and Correcting Codes \| 365 Days of Computer \| Medium
Meta Description	Before we can store files, let’s make sure that the hardware they are saved on doesn’t somehow break.
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
Author	null
Publish Time	2025-03-09 06:27:41 (1 year ago)
Original Publish Time	2025-03-09 06:27:41 (1 year ago)
Republished	No
Word Count (Total)	1,594
Word Count (Content)	1,485
Links
External Links	3
Internal Links	24
Technical SEO
Meta Nofollow	No
Meta Noarchive	Yes
JS Rendered	No
Redirect Target	null
Performance
Download Time (ms)	442
TTFB (ms)	441
Download Size (bytes)	31,546
Location
Host ID	77 (laksa077)
Partition ID	31
Root Hash	13179037029838926277
Unparsed URL	com,medium!/@365daysofcomputer/47-error-detecting-and-correcting-codes-590431271137 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

Page Info Filters

Page Details