🕷️ Crawler Inspector

URL Lookup

Direct Parameter Lookup

Raw Queries and Responses

1. Shard Calculation

Query:

Response:

Calculated Shard: 180 (from laksa017)

2. Crawled Status Check

Query:

curl -X POST \
  'http://laksa180.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 = 54 AND (src_root_hash, src_unparsed) IN ((getAhrefsRootHashFromUnparsed(getAhrefsUnparsedNoserviceFromURL(\'https://catalog.mit.edu/interdisciplinary/graduate-programs/computational-science-engineering/\')), getAhrefsUnparsedNoserviceFromURL(\'https://catalog.mit.edu/interdisciplinary/graduate-programs/computational-science-engineering/\'))) FORMAT JSONEachRow'

Response:

{"found_url":"https:\/\/catalog.mit.edu\/interdisciplinary\/graduate-programs\/computational-science-engineering\/","crawl_time":1775483961,"first_indexed_time":1695388896,"http_code":200,"src_unparsed":"edu,mit!catalog,\/interdisciplinary\/graduate-programs\/computational-science-engineering\/ s443","src_root_hash":"10722954425220430980","history_drop_reason":null,"meta_title":"Computational Science and Engineering | MIT Course Catalog","meta_descriptions":[],"meta_canonical":null,"ml_categories_json":"{\"\/Jobs_and_Education\":824,\"\/Jobs_and_Education\/Education\":824,\"\/Computers_and_Electronics\":587,\"\/Jobs_and_Education\/Education\/Colleges_and_Universities\":566,\"\/Computers_and_Electronics\/Programming\":373,\"\/Computers_and_Electronics\/Programming\/Development_Tools\":208}","ml_types_json":"{\"\/Core_Page\":704,\"\/Core_Page\/Services_Page\":666}","ml_intent_types_json":"{\"Informational\":948,\"Navigational\":157}","meta_language":"en","attrs_author":null,"attrs_publish_time":0,"attrs_original_publish_time":1695388896,"attrs_is_republished":0,"attrs_nr_words":"3594","attrs_boilerpipe_nr_words":"1516","body_ext_links_number":4,"body_int_links_number":452,"meta_nofollow":0,"meta_noarchive":0,"props_was_rendered":1,"src_redirect":"","download_time_msec":164,"download_ttfb_msec":101,"download_size":93499}

3. Robots.txt Check

Query:

Response:

4. Spam/Ban Check

Query:

Response:

5. Seen Status Check

ℹ️ Skipped - page is already crawled

📍

LOCATION

Host 180 · Partition 54

laksa180

10722954425220430980

📄

INDEXABLE

✅

CRAWLED

1 month 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`	1.9 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://catalog.mit.edu/interdisciplinary/graduate-programs/computational-science-engineering/

Last Crawled

2026-04-06 13:59:21 (1 month ago)

First Indexed

2023-09-22 13:21:36 (2 years ago)

HTTP Status Code

200

Content

Meta Title

Computational Science and Engineering | MIT Course Catalog

Meta Description

null

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		82.4%
/Jobs_and_Education/Education		82.4%
/Computers_and_Electronics		58.7%
/Jobs_and_Education/Education/Colleges_and_Universities		56.6%
/Computers_and_Electronics/Programming		37.3%
/Computers_and_Electronics/Programming/Development_Tools		20.8%

Raw JSON

{
    "/Jobs_and_Education": 824,
    "/Jobs_and_Education/Education": 824,
    "/Computers_and_Electronics": 587,
    "/Jobs_and_Education/Education/Colleges_and_Universities": 566,
    "/Computers_and_Electronics/Programming": 373,
    "/Computers_and_Electronics/Programming/Development_Tools": 208
}

ML Page Types

/Core_Page		70.4%
/Core_Page/Services_Page		66.6%

Raw JSON

{
    "/Core_Page": 704,
    "/Core_Page/Services_Page": 666
}

ML Intent Types

Informational		94.8%
Navigational		15.7%

Raw JSON

{
    "Informational": 948,
    "Navigational": 157
}

Content Metadata

Language

Author

null

Publish Time

not set

Original Publish Time

2023-09-22 13:21:36 (2 years ago)

Republished

Word Count (Total)

3,594

Word Count (Content)

1,516

Links

External Links

Internal Links

452

Technical SEO

Meta Nofollow

Meta Noarchive

JS Rendered

Yes

Redirect Target

null

Performance

Download Time (ms)

164

TTFB (ms)

101

Download Size (bytes)

93,499

Location

Host ID

180 (laksa180)

Partition ID

Root Hash

10722954425220430980

Unparsed URL

edu,mit!catalog,/interdisciplinary/graduate-programs/computational-science-engineering/ s443