🕷️ Crawler Inspector

URL Lookup

Direct Parameter Lookup

Raw Queries and Responses

1. Shard Calculation

Query:

Response:

Calculated Shard: 32 (from laksa004)

2. Crawled Status Check

Query:

curl -X POST \
  'http://laksa032.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 = 81 AND (src_root_hash, src_unparsed) IN ((getAhrefsRootHashFromUnparsed(getAhrefsUnparsedNoserviceFromURL(\'https://www.electronicsforu.com/technology-trends/error-correcting-codes-comm-storage\')), getAhrefsUnparsedNoserviceFromURL(\'https://www.electronicsforu.com/technology-trends/error-correcting-codes-comm-storage\'))) FORMAT JSONEachRow'

Response:

{"found_url":"https:\/\/www.electronicsforu.com\/technology-trends\/error-correcting-codes-comm-storage","crawl_time":1780467871,"first_indexed_time":1580306800,"http_code":200,"src_unparsed":"com,electronicsforu!www,\/technology-trends\/error-correcting-codes-comm-storage s443","src_root_hash":"13811481174739396232","history_drop_reason":null,"meta_title":"How Error Correcting Codes (EECs) Help In Communication & Storage","meta_descriptions":["This article gives you a detailed explanation of error correcting codes and why storage and communication technology are embedded by these codes."],"meta_canonical":null,"ml_categories_json":"{\"\/Computers_and_Electronics\":796,\"\/Computers_and_Electronics\/Networking\":682,\"\/Computers_and_Electronics\/Networking\/Networking_Equipment\":339,\"\/Internet_and_Telecom\":269,\"\/Internet_and_Telecom\/Communications_Equipment\":249}","ml_types_json":"{\"\/Article\":999,\"\/Article\/Tutorial_or_Guide\":825}","ml_intent_types_json":"{\"Informational\":999}","meta_language":"en-gb","attrs_author":"Eben Efyian","attrs_publish_time":1482573185,"attrs_original_publish_time":1482573185,"attrs_is_republished":0,"attrs_nr_words":"2973","attrs_boilerpipe_nr_words":"1359","body_ext_links_number":19,"body_int_links_number":111,"meta_nofollow":0,"meta_noarchive":0,"props_was_rendered":1,"src_redirect":"","download_time_msec":214,"download_ttfb_msec":206,"download_size":79704}

3. Robots.txt Check

Query:

Response:

4. Spam/Ban Check

Query:

Response:

5. Seen Status Check

ℹ️ Skipped - page is already crawled

📍

LOCATION

Host 32 · Partition 81

laksa032

13811481174739396232

📄

INDEXABLE

✅

CRAWLED

3 hours 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 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.electronicsforu.com/technology-trends/error-correcting-codes-comm-storage

Last Crawled

2026-06-03 06:24:31 (3 hours ago)

First Indexed

2020-01-29 14:06:40 (6 years ago)

HTTP Status Code

200

Content

Meta Title

How Error Correcting Codes (EECs) Help In Communication & Storage

Meta Description

This article gives you a detailed explanation of error correcting codes and why storage and communication technology are embedded by these 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		79.6%
/Computers_and_Electronics/Networking		68.2%
/Computers_and_Electronics/Networking/Networking_Equipment		33.9%
/Internet_and_Telecom		26.9%
/Internet_and_Telecom/Communications_Equipment		24.9%

Raw JSON

{
    "/Computers_and_Electronics": 796,
    "/Computers_and_Electronics/Networking": 682,
    "/Computers_and_Electronics/Networking/Networking_Equipment": 339,
    "/Internet_and_Telecom": 269,
    "/Internet_and_Telecom/Communications_Equipment": 249
}

ML Page Types

/Article		99.9%
/Article/Tutorial_or_Guide		82.5%

Raw JSON

{
    "/Article": 999,
    "/Article/Tutorial_or_Guide": 825
}

ML Intent Types

Informational

99.9%

Raw JSON

{
    "Informational": 999
}

Content Metadata

Language

en-gb

Author

Eben Efyian

Publish Time

2016-12-24 09:53:05 (9 years ago)

Original Publish Time

2016-12-24 09:53:05 (9 years ago)

Republished

Word Count (Total)

2,973

Word Count (Content)

1,359

Links

External Links

Internal Links

111

Technical SEO

Meta Nofollow

Meta Noarchive

JS Rendered

Yes

Redirect Target

null

Performance

Download Time (ms)

214

TTFB (ms)

206

Download Size (bytes)

79,704

Location

Host ID

32 (laksa032)

Partition ID

Root Hash

13811481174739396232

Unparsed URL

com,electronicsforu!www,/technology-trends/error-correcting-codes-comm-storage s443