🕷️ Crawler Inspector

URL Lookup

Direct Parameter Lookup

Raw Queries and Responses

1. Shard Calculation

Query:

Response:

Calculated Shard: 197 (from laksa139)

2. Crawled Status Check

Query:

curl -X POST \
  'http://laksa197.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 = 49 AND (src_root_hash, src_unparsed) IN ((getAhrefsRootHashFromUnparsed(getAhrefsUnparsedNoserviceFromURL(\'https://zh.d2l.ai/chapter_preface/index.html\')), getAhrefsUnparsedNoserviceFromURL(\'https://zh.d2l.ai/chapter_preface/index.html\'))) FORMAT JSONEachRow'

Response:

{"found_url":"https:\/\/zh.d2l.ai\/chapter_preface\/index.html","crawl_time":1777172308,"first_indexed_time":1638698854,"http_code":200,"src_unparsed":"ai,d2l!zh,\/chapter_preface\/index.html s443","src_root_hash":"15173883576131409997","history_drop_reason":null,"meta_title":"前言 — 动手学深度学习 2.0.0 documentation","meta_descriptions":[],"meta_canonical":null,"ml_categories_json":"{\"\/Computers_and_Electronics\":907,\"\/Computers_and_Electronics\/Software\":575,\"\/Computers_and_Electronics\/Software\/Educational_Software\":551,\"\/Jobs_and_Education\":162,\"\/Jobs_and_Education\/Education\":162,\"\/Jobs_and_Education\/Education\/Computer_Education\":131,\"\/Science\":112,\"\/Science\/Computer_Science\":107,\"\/Science\/Computer_Science\/Machine_Learning_and_Artificial_Intelligence\":103}","ml_types_json":"{\"\/Document\":860,\"\/Document\/Manual\":506}","ml_intent_types_json":"{\"Informational\":997}","meta_language":"en","attrs_author":null,"attrs_publish_time":0,"attrs_original_publish_time":1638698854,"attrs_is_republished":0,"attrs_nr_words":"1405","attrs_boilerpipe_nr_words":"769","body_ext_links_number":5,"body_int_links_number":153,"meta_nofollow":0,"meta_noarchive":0,"props_was_rendered":0,"src_redirect":"","download_time_msec":362,"download_ttfb_msec":361,"download_size":86753}

3. Robots.txt Check

Query:

Response:

4. Spam/Ban Check

Query:

Response:

5. Seen Status Check

ℹ️ Skipped - page is already crawled

📍

LOCATION

Host 197 · Partition 49

laksa197

15173883576131409997

📄

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`	1.3 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://zh.d2l.ai/chapter_preface/index.html

Last Crawled

2026-04-26 02:58:28 (1 month ago)

First Indexed

2021-12-05 10:07:34 (4 years ago)

HTTP Status Code

200

Content

Meta Title

前言 — 动手学深度学习 2.0.0 documentation

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

/Computers_and_Electronics		90.7%
/Computers_and_Electronics/Software		57.5%
/Computers_and_Electronics/Software/Educational_Software		55.1%
/Jobs_and_Education		16.2%
/Jobs_and_Education/Education		16.2%
/Jobs_and_Education/Education/Computer_Education		13.1%
/Science		11.2%
/Science/Computer_Science		10.7%
/Science/Computer_Science/Machine_Learning_and_Artificial_Intelligence		10.3%

Raw JSON

{
    "/Computers_and_Electronics": 907,
    "/Computers_and_Electronics/Software": 575,
    "/Computers_and_Electronics/Software/Educational_Software": 551,
    "/Jobs_and_Education": 162,
    "/Jobs_and_Education/Education": 162,
    "/Jobs_and_Education/Education/Computer_Education": 131,
    "/Science": 112,
    "/Science/Computer_Science": 107,
    "/Science/Computer_Science/Machine_Learning_and_Artificial_Intelligence": 103
}

ML Page Types

/Document		86.0%
/Document/Manual		50.6%

Raw JSON

{
    "/Document": 860,
    "/Document/Manual": 506
}

ML Intent Types

Informational

99.7%

Raw JSON

{
    "Informational": 997
}

Content Metadata

Language

Author

null

Publish Time

not set

Original Publish Time

2021-12-05 10:07:34 (4 years ago)

Republished

Word Count (Total)

1,405

Word Count (Content)

769

Links

External Links

Internal Links

153

Technical SEO

Meta Nofollow

Meta Noarchive

JS Rendered

Redirect Target

null

Performance

Download Time (ms)

362

TTFB (ms)

361

Download Size (bytes)

86,753

Location

Host ID

197 (laksa197)

Partition ID

Root Hash

15173883576131409997

Unparsed URL

ai,d2l!zh,/chapter_preface/index.html s443