🕷️ Crawler Inspector

URL Lookup

Direct Parameter Lookup

Raw Queries and Responses

1. Shard Calculation

Query:

Response:

Calculated Shard: 90 (from laksa177)

2. Crawled Status Check

Query:

curl -X POST \
  'http://laksa090.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 = 96 AND (src_root_hash, src_unparsed) IN ((getAhrefsRootHashFromUnparsed(getAhrefsUnparsedNoserviceFromURL(\'https://hackr.io/blog/best-computer-science-courses-online\')), getAhrefsUnparsedNoserviceFromURL(\'https://hackr.io/blog/best-computer-science-courses-online\'))) FORMAT JSONEachRow'

Response:

{"found_url":"https:\/\/hackr.io\/blog\/best-computer-science-courses-online","crawl_time":1778733163,"first_indexed_time":1638691420,"http_code":200,"src_unparsed":"io,hackr!\/blog\/best-computer-science-courses-online s443","src_root_hash":"7398554844896059290","history_drop_reason":null,"meta_title":"11 Best Computer Science Courses Online in 2026 [Free + Paid]","meta_descriptions":["Want to learn computer science? We’ve found the 11 best computer science courses in 2026 to learn programming, data structures, algorithms, and more."],"meta_canonical":null,"ml_categories_json":"{\"\/Jobs_and_Education\":837,\"\/Jobs_and_Education\/Education\":837,\"\/Jobs_and_Education\/Education\/Computer_Education\":617,\"\/Computers_and_Electronics\":573,\"\/Computers_and_Electronics\/Programming\":365,\"\/Computers_and_Electronics\/Programming\/Development_Tools\":246}","ml_types_json":"{\"\/Article\":703,\"\/Article\/Roundup\":495}","ml_intent_types_json":"{\"Informational\":820,\"Commercial\":653}","meta_language":"en","attrs_author":"Vijay Singh Khatri","attrs_publish_time":0,"attrs_original_publish_time":1638691420,"attrs_is_republished":0,"attrs_nr_words":"4508","attrs_boilerpipe_nr_words":"2677","body_ext_links_number":22,"body_int_links_number":228,"meta_nofollow":0,"meta_noarchive":0,"props_was_rendered":1,"src_redirect":"","download_time_msec":226,"download_ttfb_msec":182,"download_size":48767}

3. Robots.txt Check

Query:

Response:

4. Spam/Ban Check

Query:

Response:

5. Seen Status Check

ℹ️ Skipped - page is already crawled

📍

LOCATION

Host 90 · Partition 96

laksa090

7398554844896059290

📄

INDEXABLE

✅

CRAWLED

19 days ago

🤖

ROBOTS ALLOWED

Page Info Filters

Filter	Status	Condition	Details
HTTP status	PASS	`download_http_code = 200`	HTTP 200
Age cutoff	PASS	`download_stamp > now() - 6 MONTH`	0.7 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

Page Details

Property

Value

URL

https://hackr.io/blog/best-computer-science-courses-online

Last Crawled

2026-05-14 04:32:43 (19 days ago)

First Indexed

2021-12-05 08:03:40 (4 years ago)

HTTP Status Code

200

Content

Meta Title

11 Best Computer Science Courses Online in 2026 [Free + Paid]

Meta Description

Want to learn computer science? We’ve found the 11 best computer science courses in 2026 to learn programming, data structures, algorithms, and more.

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

/Jobs_and_Education		83.7%
/Jobs_and_Education/Education		83.7%
/Jobs_and_Education/Education/Computer_Education		61.7%
/Computers_and_Electronics		57.3%
/Computers_and_Electronics/Programming		36.5%
/Computers_and_Electronics/Programming/Development_Tools		24.6%

Raw JSON

{
    "/Jobs_and_Education": 837,
    "/Jobs_and_Education/Education": 837,
    "/Jobs_and_Education/Education/Computer_Education": 617,
    "/Computers_and_Electronics": 573,
    "/Computers_and_Electronics/Programming": 365,
    "/Computers_and_Electronics/Programming/Development_Tools": 246
}

ML Page Types

/Article		70.3%
/Article/Roundup		49.5%

Raw JSON

{
    "/Article": 703,
    "/Article/Roundup": 495
}

ML Intent Types

Informational		82.0%
Commercial		65.3%

Raw JSON

{
    "Informational": 820,
    "Commercial": 653
}

Content Metadata

Language

Author

Vijay Singh Khatri

Publish Time

not set

Original Publish Time

2021-12-05 08:03:40 (4 years ago)

Republished

Word Count (Total)

4,508

Word Count (Content)

2,677

Links

External Links

Internal Links

228

Technical SEO

Meta Nofollow

Meta Noarchive

JS Rendered

Yes

Redirect Target

null

Performance

Download Time (ms)

226

TTFB (ms)

182

Download Size (bytes)

48,767

Location

Host ID

90 (laksa090)

Partition ID

Root Hash

7398554844896059290

Unparsed URL

io,hackr!/blog/best-computer-science-courses-online s443