🕷️ Crawler Inspector

URL Lookup

Direct Parameter Lookup

Raw Queries and Responses

1. Shard Calculation

Query:

Response:

Calculated Shard: 5 (from laksa075)

2. Crawled Status Check

Query:

curl -X POST \
  'http://laksa005.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://simons.berkeley.edu/programs/error-correcting-codes-theory-practice\')), getAhrefsUnparsedNoserviceFromURL(\'https://simons.berkeley.edu/programs/error-correcting-codes-theory-practice\'))) FORMAT JSONEachRow'

Response:

{"found_url":"https:\/\/simons.berkeley.edu\/programs\/error-correcting-codes-theory-practice","crawl_time":1773183808,"first_indexed_time":1671156131,"http_code":200,"src_unparsed":"edu,berkeley!simons,\/programs\/error-correcting-codes-theory-practice s443","src_root_hash":"12957858574685170805","history_drop_reason":null,"meta_title":"Error-Correcting Codes: Theory and Practice","meta_descriptions":["This program brings together an interdisciplinary group of researchers to explore the frontiers of the theory and practice of error-correcting codes."],"meta_canonical":null,"ml_categories_json":"{\"\/Computers_and_Electronics\":702,\"\/Computers_and_Electronics\/Programming\":581,\"\/Science\":443,\"\/Science\/Computer_Science\":427,\"\/Science\/Computer_Science\/Other\":291,\"\/Computers_and_Electronics\/Programming\/C_and_C++\":204,\"\/Jobs_and_Education\":169,\"\/Jobs_and_Education\/Education\":169}","ml_types_json":"{\"\/Core_Page\":682,\"\/Core_Page\/Services_Page\":555}","ml_intent_types_json":"{\"Informational\":996}","meta_language":"en","attrs_author":null,"attrs_publish_time":1704801600,"attrs_original_publish_time":1671156131,"attrs_is_republished":1,"attrs_nr_words":"1032","attrs_boilerpipe_nr_words":"284","body_ext_links_number":4,"body_int_links_number":115,"meta_nofollow":0,"meta_noarchive":0,"props_was_rendered":1,"src_redirect":"","download_time_msec":2537,"download_ttfb_msec":2535,"download_size":17564}

3. Robots.txt Check

Query:

Response:

4. Spam/Ban Check

Query:

Response:

5. Seen Status Check

ℹ️ Skipped - page is already crawled

📍

LOCATION

Host 5 · Partition 54

laksa005

12957858574685170805

📄

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`	2.8 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

Page Details

Property

Value

URL

https://simons.berkeley.edu/programs/error-correcting-codes-theory-practice

Last Crawled

2026-03-10 23:03:28 (2 months ago)

First Indexed

2022-12-16 02:02:11 (3 years ago)

HTTP Status Code

200

Content

Meta Title

Error-Correcting Codes: Theory and Practice

Meta Description

This program brings together an interdisciplinary group of researchers to explore the frontiers of the theory and practice of error-correcting codes.

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

/Computers_and_Electronics		70.2%
/Computers_and_Electronics/Programming		58.1%
/Science		44.3%
/Science/Computer_Science		42.7%
/Science/Computer_Science/Other		29.1%
/Computers_and_Electronics/Programming/C_and_C++		20.4%
/Jobs_and_Education		16.9%
/Jobs_and_Education/Education		16.9%

Raw JSON

{
    "/Computers_and_Electronics": 702,
    "/Computers_and_Electronics/Programming": 581,
    "/Science": 443,
    "/Science/Computer_Science": 427,
    "/Science/Computer_Science/Other": 291,
    "/Computers_and_Electronics/Programming/C_and_C++": 204,
    "/Jobs_and_Education": 169,
    "/Jobs_and_Education/Education": 169
}

ML Page Types

/Core_Page		68.2%
/Core_Page/Services_Page		55.5%

Raw JSON

{
    "/Core_Page": 682,
    "/Core_Page/Services_Page": 555
}

ML Intent Types

Informational

99.6%

Raw JSON

{
    "Informational": 996
}

Content Metadata

Language

Author

null

Publish Time

2024-01-09 12:00:00 (2 years ago)

Original Publish Time

2022-12-16 02:02:11 (3 years ago)

Republished

Yes

Word Count (Total)

1,032

Word Count (Content)

284

Links

External Links

Internal Links

115

Technical SEO

Meta Nofollow

Meta Noarchive

JS Rendered

Yes

Redirect Target

null

Performance

Download Time (ms)

2,537

TTFB (ms)

2,535

Download Size (bytes)

17,564

Location

Host ID

5 (laksa005)

Partition ID

Root Hash

12957858574685170805

Unparsed URL

edu,berkeley!simons,/programs/error-correcting-codes-theory-practice s443