🕷️ Crawler Inspector

URL Lookup

Direct Parameter Lookup

Raw Queries and Responses

1. Shard Calculation

Query:

Response:

Calculated Shard: 61 (from laksa015)

2. Crawled Status Check

Query:

curl -X POST \
  'http://laksa061.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 = 30 AND (src_root_hash, src_unparsed) IN ((getAhrefsRootHashFromUnparsed(getAhrefsUnparsedNoserviceFromURL(\'https://www.ccbp.in/blog/articles/error-detection-and-correction-in-computer-networks\')), getAhrefsUnparsedNoserviceFromURL(\'https://www.ccbp.in/blog/articles/error-detection-and-correction-in-computer-networks\'))) FORMAT JSONEachRow'

Response:

{"found_url":"https:\/\/www.ccbp.in\/blog\/articles\/error-detection-and-correction-in-computer-networks","crawl_time":1778829430,"first_indexed_time":1741355790,"http_code":200,"src_unparsed":"in,ccbp!www,\/blog\/articles\/error-detection-and-correction-in-computer-networks s443","src_root_hash":"11517475992042086061","history_drop_reason":null,"meta_title":"What is Error Detection and Correction in Computer Networks","meta_descriptions":["Error Detection and Correction in computer networks involves techniques to identify and fix errors in data transmission, ensuring accurate and reliable communication."],"meta_canonical":null,"ml_categories_json":"{\"\/Computers_and_Electronics\":930,\"\/Computers_and_Electronics\/Computer_Security\":556,\"\/Computers_and_Electronics\/Computer_Security\/Network_Security\":520,\"\/Internet_and_Telecom\":168}","ml_types_json":"{\"\/Article\":999,\"\/Article\/Tutorial_or_Guide\":504}","ml_intent_types_json":"{\"Informational\":999}","meta_language":"en","attrs_author":null,"attrs_publish_time":0,"attrs_original_publish_time":1741355790,"attrs_is_republished":0,"attrs_nr_words":"3950","attrs_boilerpipe_nr_words":"2929","body_ext_links_number":17,"body_int_links_number":58,"meta_nofollow":0,"meta_noarchive":0,"props_was_rendered":1,"src_redirect":"","download_time_msec":75,"download_ttfb_msec":73,"download_size":31617}

3. Robots.txt Check

Query:

Response:

4. Spam/Ban Check

Query:

Response:

5. Seen Status Check

ℹ️ Skipped - page is already crawled

📍

LOCATION

Host 61 · Partition 30

laksa061

11517475992042086061

📄

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`	0.6 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://www.ccbp.in/blog/articles/error-detection-and-correction-in-computer-networks

Last Crawled

2026-05-15 07:17:10 (19 days ago)

First Indexed

2025-03-07 13:56:30 (1 year ago)

HTTP Status Code

200

Content

Meta Title

What is Error Detection and Correction in Computer Networks

Meta Description

Error Detection and Correction in computer networks involves techniques to identify and fix errors in data transmission, ensuring accurate and reliable communication.

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		93.0%
/Computers_and_Electronics/Computer_Security		55.6%
/Computers_and_Electronics/Computer_Security/Network_Security		52.0%
/Internet_and_Telecom		16.8%

Raw JSON

{
    "/Computers_and_Electronics": 930,
    "/Computers_and_Electronics/Computer_Security": 556,
    "/Computers_and_Electronics/Computer_Security/Network_Security": 520,
    "/Internet_and_Telecom": 168
}

ML Page Types

/Article		99.9%
/Article/Tutorial_or_Guide		50.4%

Raw JSON

{
    "/Article": 999,
    "/Article/Tutorial_or_Guide": 504
}

ML Intent Types

Informational

99.9%

Raw JSON

{
    "Informational": 999
}

Content Metadata

Language

Author

null

Publish Time

not set

Original Publish Time

2025-03-07 13:56:30 (1 year ago)

Republished

Word Count (Total)

3,950

Word Count (Content)

2,929

Links

External Links

Internal Links

Technical SEO

Meta Nofollow

Meta Noarchive

JS Rendered

Yes

Redirect Target

null

Performance

Download Time (ms)

TTFB (ms)

Download Size (bytes)

31,617

Location

Host ID

61 (laksa061)

Partition ID

Root Hash

11517475992042086061

Unparsed URL

in,ccbp!www,/blog/articles/error-detection-and-correction-in-computer-networks s443