🕷️ Crawler Inspector

URL Lookup

Direct Parameter Lookup

Raw Queries and Responses

1. Shard Calculation

Query:

Response:

Calculated Shard: 95 (from laksa108)

2. Crawled Status Check

Query:

curl -X POST \
  'http://laksa095.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 = 92 AND (src_root_hash, src_unparsed) IN ((getAhrefsRootHashFromUnparsed(getAhrefsUnparsedNoserviceFromURL(\'https://opensource.com/article/19/4/interprocess-communication-linux-networking\')), getAhrefsUnparsedNoserviceFromURL(\'https://opensource.com/article/19/4/interprocess-communication-linux-networking\'))) FORMAT JSONEachRow'

Response:

{"found_url":"https:\/\/opensource.com\/article\/19\/4\/interprocess-communication-linux-networking","crawl_time":1777305184,"first_indexed_time":1555484937,"http_code":200,"src_unparsed":"com,opensource!\/article\/19\/4\/interprocess-communication-linux-networking s443","src_root_hash":"12209221891525358495","history_drop_reason":null,"meta_title":"Inter-process communication in Linux: Sockets and signals | Opensource.com","meta_descriptions":["Learn how processes synchronize with each other in Linux."],"meta_canonical":null,"ml_categories_json":"{\"\/Computers_and_Electronics\":972,\"\/Computers_and_Electronics\/Networking\":546,\"\/Computers_and_Electronics\/Networking\/Data_Formats_and_Protocols\":209,\"\/Internet_and_Telecom\":172}","ml_types_json":"{\"\/Article\":998,\"\/Article\/Tutorial_or_Guide\":965}","ml_intent_types_json":"{\"Informational\":999}","meta_language":"en","attrs_author":"Marty Kalin","attrs_publish_time":0,"attrs_original_publish_time":1555484937,"attrs_is_republished":0,"attrs_nr_words":"3401","attrs_boilerpipe_nr_words":"3051","body_ext_links_number":9,"body_int_links_number":37,"meta_nofollow":0,"meta_noarchive":0,"props_was_rendered":0,"src_redirect":"","download_time_msec":120,"download_ttfb_msec":119,"download_size":15757}

3. Robots.txt Check

Query:

Response:

4. Spam/Ban Check

Query:

Response:

5. Seen Status Check

ℹ️ Skipped - page is already crawled

📍

LOCATION

Host 95 · Partition 92

laksa095

12209221891525358495

📄

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`	1.2 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://opensource.com/article/19/4/interprocess-communication-linux-networking

Last Crawled

2026-04-27 15:53:04 (1 month ago)

First Indexed

2019-04-17 07:08:57 (7 years ago)

HTTP Status Code

200

Content

Meta Title

Inter-process communication in Linux: Sockets and signals | Opensource.com

Meta Description

Learn how processes synchronize with each other in Linux.

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		97.2%
/Computers_and_Electronics/Networking		54.6%
/Computers_and_Electronics/Networking/Data_Formats_and_Protocols		20.9%
/Internet_and_Telecom		17.2%

Raw JSON

{
    "/Computers_and_Electronics": 972,
    "/Computers_and_Electronics/Networking": 546,
    "/Computers_and_Electronics/Networking/Data_Formats_and_Protocols": 209,
    "/Internet_and_Telecom": 172
}

ML Page Types

/Article		99.8%
/Article/Tutorial_or_Guide		96.5%

Raw JSON

{
    "/Article": 998,
    "/Article/Tutorial_or_Guide": 965
}

ML Intent Types

Informational

99.9%

Raw JSON

{
    "Informational": 999
}

Content Metadata

Language

Author

Marty Kalin

Publish Time

not set

Original Publish Time

2019-04-17 07:08:57 (7 years ago)

Republished

Word Count (Total)

3,401

Word Count (Content)

3,051

Links

External Links

Internal Links

Technical SEO

Meta Nofollow

Meta Noarchive

JS Rendered

Redirect Target

null

Performance

Download Time (ms)

120

TTFB (ms)

119

Download Size (bytes)

15,757

Location

Host ID

95 (laksa095)

Partition ID

Root Hash

12209221891525358495

Unparsed URL

com,opensource!/article/19/4/interprocess-communication-linux-networking s443