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什么是抓取異常？網(wǎng)站抓取異常的原因

抓取異常是指在進(jìn)行網(wǎng)站爬取或數(shù)據(jù)抽取時(shí)，出現(xiàn)的各種不能正常處理的異常情況。常見的抓取異常包括但不限于：網(wǎng)站被封禁、網(wǎng)站不允許爬取、請(qǐng)求超時(shí)、頁面格式錯(cuò)誤、網(wǎng)絡(luò)故障等。網(wǎng)站抓取異常的原因主要有以下幾種： 1. 服務(wù)器響應(yīng)速度過慢或者網(wǎng)絡(luò)故障，導(dǎo)致請(qǐng)求超時(shí)或者失敗。 2. 服務(wù)器為了防止爬蟲惡意掃描把IP封禁。 3. 爬蟲的請(qǐng)求頻率過高，被網(wǎng)站發(fā)現(xiàn)并且拒絕響應(yīng)請(qǐng)求，導(dǎo)致爬蟲無法正常工作。 4. 網(wǎng)站的頁面格式發(fā)生改變，使得原有爬蟲無法正常解析頁面內(nèi)容。 5. 網(wǎng)站的反爬蟲機(jī)制升級(jí)，使得原有爬蟲無法繞過反爬蟲機(jī)制繼續(xù)爬取。 6. 爬取數(shù)據(jù)量過大，導(dǎo)致網(wǎng)站的服務(wù)器無法承受太大的并發(fā)請(qǐng)求。為了避免這些異常情況的發(fā)生，應(yīng)該合理設(shè)置爬取頻率、休眠時(shí)間等參數(shù)，同時(shí)關(guān)注網(wǎng)站反爬蟲機(jī)制的變化，及時(shí)調(diào)整策略。

Public @ 2023-04-23 23:50:12

索引量大幅度波動(dòng)怎么辦？

如果索引量大幅度波動(dòng)，可以采取以下措施： 1. 分析原因：首先要了解波動(dòng)是什么導(dǎo)致的，可能是由于行業(yè)變化、政策變化、競(jìng)爭(zhēng)加劇等原因?qū)е拢枰业骄唧w原因，以便制定對(duì)策。 2. 調(diào)整策略：根據(jù)波動(dòng)的原因，調(diào)整公司的策略，如調(diào)整產(chǎn)品或服務(wù)、加強(qiáng)市場(chǎng)營銷等措施，以彌補(bǔ)波動(dòng)帶來的影響。 3. 保持穩(wěn)定：在波動(dòng)時(shí)期保持穩(wěn)定，不要慌亂，不要過度依賴某個(gè)品類或市場(chǎng)，應(yīng)該分散風(fēng)險(xiǎn)，保持收益平穩(wěn)。 4. 加

Public @ 2023-05-27 05:50:10

漏洞檢測(cè)工具beta版上線

很高興地宣布，我們的漏洞檢測(cè)工具beta版已經(jīng)上線了！這是一個(gè)非常期待的里程碑，我們的開發(fā)團(tuán)隊(duì)為此付出了數(shù)月的辛勤努力。我們的漏洞檢測(cè)工具旨在幫助企業(yè)和個(gè)人檢測(cè)他們的系統(tǒng)中存在的漏洞。該工具使用全面的漏洞掃描技術(shù)，包括常見的Web應(yīng)用程序漏洞，如SQL注入和跨站腳本（XSS），以及網(wǎng)絡(luò)協(xié)議級(jí)漏洞，例如DNS欺騙和ARP欺騙，以確保系統(tǒng)的整體安全性。在beta版中，我們將免費(fèi)提供該工具的使用

Public @ 2023-06-07 11:50:15

什么是抓取異常？網(wǎng)站抓取異常的原因

什么是抓取異常？指的是蜘蛛無法正常抓取頁面，網(wǎng)站出現(xiàn)抓取異常。網(wǎng)站抓取異常的原因：1、服務(wù)器異常服務(wù)器連接異常最大的可能是網(wǎng)站服務(wù)器過大，超負(fù)荷運(yùn)轉(zhuǎn)，通過檢查瀏覽器是否正常訪問。服務(wù)器異常會(huì)導(dǎo)致蜘蛛無法連接網(wǎng)站服務(wù)器，導(dǎo)致出現(xiàn)抓取失敗。2、域名到期域名過期網(wǎng)站肯定不能訪問，域名解析會(huì)失效，如果存在這類情況請(qǐng)與域名注冊(cè)商聯(lián)系。3、網(wǎng)絡(luò)運(yùn)營商異常電信和聯(lián)通這兩種都是屬于網(wǎng)絡(luò)運(yùn)營商，蜘蛛無法訪問的網(wǎng)站。

Public @ 2014-01-23 16:03:52

什么是抓取異常？網(wǎng)站抓取異常的原因

Public @ 2023-04-23 23:50:12

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基本文件流程錯(cuò)誤 SQL 調(diào)試

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[ DB ] CONNECT:[ UseTime:0.025935s ] mysql:dbname=briline.net;host=106.14.77.182;port=3306;charset=utf8
[ SQL ] SHOW COLUMNS FROM `ob_config` [ RunTime:0.018425s ]
[ SQL ] SELECT * FROM `ob_config` [ RunTime:0.017482s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_config', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 25, 'extra' => NULL, ) ]
[ SQL ] SHOW COLUMNS FROM `ob_hook` [ RunTime:0.018830s ]
[ SQL ] SELECT `id`,`name`,`addon_list` FROM `ob_hook` [ RunTime:0.018383s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_hook', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 3, 'extra' => NULL, ) ]
[ SQL ] SHOW COLUMNS FROM `ob_article` [ RunTime:0.018580s ]
[ SQL ] SELECT * FROM `ob_article` WHERE `id` = 7664 LIMIT 1 [ RunTime:0.017572s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article', 'type' => 'const', 'possible_keys' => 'PRIMARY', 'key' => 'PRIMARY', 'key_len' => '4', 'ref' => 'const', 'rows' => 1, 'extra' => NULL, ) ]
[ SQL ] select * from `ob_article_tongji` where category_id=12 and mark_type='cate' order by times desc limit 15 [ RunTime:0.017889s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article_tongji', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 608, 'extra' => 'Using where; Using filesort', ) ]
[ SQL ] select * from `ob_article_tongji` where category_id=12 and mark_type='tags' order by times desc limit 100 [ RunTime:0.018107s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article_tongji', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 608, 'extra' => 'Using where; Using filesort', ) ]
[ SQL ] select * from `ob_article_tongji` where category_id=12 and mark_type='tags' order by rand() limit 30 [ RunTime:0.018596s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article_tongji', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 608, 'extra' => 'Using where; Using temporary; Using filesort', ) ]
[ SQL ] SELECT * FROM `ob_article` WHERE `id` = 7664 LIMIT 1 [ RunTime:0.017436s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article', 'type' => 'const', 'possible_keys' => 'PRIMARY', 'key' => 'PRIMARY', 'key_len' => '4', 'ref' => 'const', 'rows' => 1, 'extra' => NULL, ) ]
[ SQL ] update `ob_article` set views=views+2 where id=7664 [ RunTime:0.020046s ]
[ SQL ] SELECT COUNT(*) AS tp_count FROM `ob_article` WHERE `category_id` = 12 AND `cate` = '威海百度搜索資源平臺(tái)' AND `status` <> -1 LIMIT 1 [ RunTime:0.024384s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 8035, 'extra' => 'Using where', ) ]
[ SQL ] SELECT * FROM `ob_article` WHERE `category_id` = 12 AND `cate` = '威海百度搜索資源平臺(tái)' AND `status` <> -1 ORDER BY rand() LIMIT 0,2 [ RunTime:0.045125s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 8035, 'extra' => 'Using where; Using temporary; Using filesort', ) ]
[ SQL ] SELECT COUNT(*) AS tp_count FROM `ob_article` WHERE `category_id` = 12 AND `tags` = '威海抓取異常' AND `status` <> -1 LIMIT 1 [ RunTime:0.024603s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 8035, 'extra' => 'Using where', ) ]
[ SQL ] SELECT * FROM `ob_article` WHERE `category_id` = 12 AND `tags` = '威海抓取異常' AND `status` <> -1 ORDER BY rand() LIMIT 0,2 [ RunTime:0.032885s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 8035, 'extra' => 'Using where; Using temporary; Using filesort', ) ]

0.587712s

Categories

Tags

什么是抓取異常？網(wǎng)站抓取異常的原因

索引量大幅度波動(dòng)怎么辦？

漏洞檢測(cè)工具beta版上線

什么是抓取異常？網(wǎng)站抓取異常的原因

什么是抓取異常？網(wǎng)站抓取異常的原因

更多您感興趣的搜索

Categories

Tags

什么是抓取異常？網(wǎng)站抓取異常的原因

索引量大幅度波動(dòng)怎么辦？

漏洞檢測(cè)工具beta版上線

什么是抓取異常？網(wǎng)站抓取異常的原因

什么是抓取異常？網(wǎng)站抓取異常的原因

更多您感興趣的搜索

索引量大幅度波動(dòng)怎么辦？