🕷️ Crawler Inspector

URL Lookup

Direct Parameter Lookup

Raw Queries and Responses

1. Shard Calculation

Query:

Response:

Calculated Shard: 175 (from laksa112)

2. Crawled Status Check

Query:

curl -X POST \
  'http://laksa175.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 = 71 AND (src_root_hash, src_unparsed) IN ((getAhrefsRootHashFromUnparsed(getAhrefsUnparsedNoserviceFromURL(\'https://lifelong-learning.ox.ac.uk/courses/introduction-to-computer-science-cs50\')), getAhrefsUnparsedNoserviceFromURL(\'https://lifelong-learning.ox.ac.uk/courses/introduction-to-computer-science-cs50\'))) FORMAT JSONEachRow'

Response:

{"found_url":"https:\/\/lifelong-learning.ox.ac.uk\/courses\/introduction-to-computer-science-cs50","crawl_time":1774972236,"first_indexed_time":1758726914,"http_code":200,"src_unparsed":"uk,ac,ox!lifelong-learning,\/courses\/introduction-to-computer-science-cs50 s443","src_root_hash":"11471578221420634375","history_drop_reason":null,"meta_title":"CS50: An Introduction to Computer Science | Oxford Lifelong Learning, University of Oxford","meta_descriptions":["Based on Harvard's famed introductory course in computer science, CS50 is now available at Oxford. This course teaches you how to solve problems, both with and without code, with an emphasis on correctness, design, and style."],"meta_canonical":null,"ml_categories_json":"{\"\/Jobs_and_Education\":921,\"\/Jobs_and_Education\/Education\":921,\"\/Jobs_and_Education\/Education\/Computer_Education\":857,\"\/Computers_and_Electronics\":829,\"\/Computers_and_Electronics\/Programming\":802,\"\/Computers_and_Electronics\/Programming\/Development_Tools\":297}","ml_types_json":"{\"\/Core_Page\":716,\"\/Core_Page\/Services_Page\":710}","ml_intent_types_json":"{\"Informational\":835,\"Commercial\":213,\"Transactional\":196}","meta_language":"en","attrs_author":"University of Oxford","attrs_publish_time":0,"attrs_original_publish_time":1758726914,"attrs_is_republished":0,"attrs_nr_words":"2311","attrs_boilerpipe_nr_words":"1206","body_ext_links_number":12,"body_int_links_number":162,"meta_nofollow":0,"meta_noarchive":0,"props_was_rendered":1,"src_redirect":"","download_time_msec":3455,"download_ttfb_msec":3452,"download_size":23582}

3. Robots.txt Check

Query:

Response:

4. Spam/Ban Check

Query:

Response:

5. Seen Status Check

ℹ️ Skipped - page is already crawled

📍

LOCATION

Host 175 · Partition 71

laksa175

11471578221420634375

📄

INDEXABLE

✅

CRAWLED

2 months 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`	2.1 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://lifelong-learning.ox.ac.uk/courses/introduction-to-computer-science-cs50

Last Crawled

2026-03-31 15:50:36 (2 months ago)

First Indexed

2025-09-24 15:15:14 (8 months ago)

HTTP Status Code

200

Content

Meta Title

CS50: An Introduction to Computer Science | Oxford Lifelong Learning, University of Oxford

Meta Description

Based on Harvard's famed introductory course in computer science, CS50 is now available at Oxford. This course teaches you how to solve problems, both with and without code, with an emphasis on correctness, design, and style.

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		92.1%
/Jobs_and_Education/Education		92.1%
/Jobs_and_Education/Education/Computer_Education		85.7%
/Computers_and_Electronics		82.9%
/Computers_and_Electronics/Programming		80.2%
/Computers_and_Electronics/Programming/Development_Tools		29.7%

Raw JSON

{
    "/Jobs_and_Education": 921,
    "/Jobs_and_Education/Education": 921,
    "/Jobs_and_Education/Education/Computer_Education": 857,
    "/Computers_and_Electronics": 829,
    "/Computers_and_Electronics/Programming": 802,
    "/Computers_and_Electronics/Programming/Development_Tools": 297
}

ML Page Types

/Core_Page		71.6%
/Core_Page/Services_Page		71.0%

Raw JSON

{
    "/Core_Page": 716,
    "/Core_Page/Services_Page": 710
}

ML Intent Types

Informational		83.5%
Commercial		21.3%
Transactional		19.6%

Raw JSON

{
    "Informational": 835,
    "Commercial": 213,
    "Transactional": 196
}

Content Metadata

Language

Author

University of Oxford

Publish Time

not set

Original Publish Time

2025-09-24 15:15:14 (8 months ago)

Republished

Word Count (Total)

2,311

Word Count (Content)

1,206

Links

External Links

Internal Links

162

Technical SEO

Meta Nofollow

Meta Noarchive

JS Rendered

Yes

Redirect Target

null

Performance

Download Time (ms)

3,455

TTFB (ms)

3,452

Download Size (bytes)

23,582

Location

Host ID

175 (laksa175)

Partition ID

Root Hash

11471578221420634375

Unparsed URL

uk,ac,ox!lifelong-learning,/courses/introduction-to-computer-science-cs50 s443