🕷️ Crawler Inspector

URL Lookup

Direct Parameter Lookup

Raw Queries and Responses

1. Shard Calculation

Query:

Response:

Calculated Shard: 150 (from laksa149)

2. Crawled Status Check

Query:

curl -X POST \
  'http://laksa150.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 = 50 AND (src_root_hash, src_unparsed) IN ((getAhrefsRootHashFromUnparsed(getAhrefsUnparsedNoserviceFromURL(\'https://semiengineering.com/knowledge_centers/memory/error-correction-code-ecc/\')), getAhrefsUnparsedNoserviceFromURL(\'https://semiengineering.com/knowledge_centers/memory/error-correction-code-ecc/\'))) FORMAT JSONEachRow'

Response:

{"found_url":"https:\/\/semiengineering.com\/knowledge_centers\/memory\/error-correction-code-ecc\/","crawl_time":1776928864,"first_indexed_time":1637344653,"http_code":200,"src_unparsed":"com,semiengineering!\/knowledge_centers\/memory\/error-correction-code-ecc\/ s443","src_root_hash":"8988268165222810150","history_drop_reason":null,"meta_title":"Error Correction Code (ECC) - Semiconductor Engineering","meta_descriptions":[],"meta_canonical":null,"ml_categories_json":"{\"\/Business_and_Industrial\":582,\"\/Computers_and_Electronics\":532,\"\/Business_and_Industrial\/Business_Services\":362,\"\/Business_and_Industrial\/Business_Services\/Consulting\":261,\"\/Computers_and_Electronics\/Software\":187,\"\/Finance\":140,\"\/Finance\/Investing\":108}","ml_types_json":"{\"\/Listing_Collection\":810,\"\/Listing_Collection\/Business\":647}","ml_intent_types_json":"{\"Informational\":522,\"Commercial\":470}","meta_language":"en-us","attrs_author":null,"attrs_publish_time":0,"attrs_original_publish_time":1637344653,"attrs_is_republished":0,"attrs_nr_words":"13282","attrs_boilerpipe_nr_words":"12513","body_ext_links_number":6,"body_int_links_number":2249,"meta_nofollow":0,"meta_noarchive":0,"props_was_rendered":1,"src_redirect":"","download_time_msec":2240,"download_ttfb_msec":1485,"download_size":138965}

3. Robots.txt Check

Query:

Response:

4. Spam/Ban Check

Query:

Response:

5. Seen Status Check

ℹ️ Skipped - page is already crawled

📍

LOCATION

Host 150 · Partition 50

laksa150

8988268165222810150

📄

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`	1.4 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://semiengineering.com/knowledge_centers/memory/error-correction-code-ecc/

Last Crawled

2026-04-23 07:21:04 (1 month ago)

First Indexed

2021-11-19 17:57:33 (4 years ago)

HTTP Status Code

200

Content

Meta Title

Error Correction Code (ECC) - Semiconductor Engineering

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

/Business_and_Industrial		58.2%
/Computers_and_Electronics		53.2%
/Business_and_Industrial/Business_Services		36.2%
/Business_and_Industrial/Business_Services/Consulting		26.1%
/Computers_and_Electronics/Software		18.7%
/Finance		14.0%
/Finance/Investing		10.8%

Raw JSON

{
    "/Business_and_Industrial": 582,
    "/Computers_and_Electronics": 532,
    "/Business_and_Industrial/Business_Services": 362,
    "/Business_and_Industrial/Business_Services/Consulting": 261,
    "/Computers_and_Electronics/Software": 187,
    "/Finance": 140,
    "/Finance/Investing": 108
}

ML Page Types

/Listing_Collection		81.0%
/Listing_Collection/Business		64.7%

Raw JSON

{
    "/Listing_Collection": 810,
    "/Listing_Collection/Business": 647
}

ML Intent Types

Informational		52.2%
Commercial		47.0%

Raw JSON

{
    "Informational": 522,
    "Commercial": 470
}

Content Metadata

Language

en-us

Author

null

Publish Time

not set

Original Publish Time

2021-11-19 17:57:33 (4 years ago)

Republished

Word Count (Total)

13,282

Word Count (Content)

12,513

Links

External Links

Internal Links

2,249

Technical SEO

Meta Nofollow

Meta Noarchive

JS Rendered

Yes

Redirect Target

null

Performance

Download Time (ms)

2,240

TTFB (ms)

1,485

Download Size (bytes)

138,965

Location

Host ID

150 (laksa150)

Partition ID

Root Hash

8988268165222810150

Unparsed URL

com,semiengineering!/knowledge_centers/memory/error-correction-code-ecc/ s443