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什么是ETag？ETag作用有哪些

ETag是HTTP協(xié)議提供的一種用于判斷資源是否發(fā)生變化的機(jī)制。ETag是一個(gè)字符串，由服務(wù)器生成，在資源被更新時(shí)會(huì)發(fā)生變化。客戶端請(qǐng)求資源時(shí)，服務(wù)器會(huì)將資源的ETag值一起返回，客戶端可以緩存資源，并記錄ETag值。當(dāng)客戶端再次請(qǐng)求該資源時(shí)，會(huì)將上次記錄的ETag值一同發(fā)送給服務(wù)器。如果此時(shí)服務(wù)器返回的ETag值與客戶端記錄的值相同，就說明資源沒有變化，客戶端可以直接使用緩存的資源，減少網(wǎng)絡(luò)請(qǐng)求。 ETag的作用主要有： 1.幫助客戶端減少網(wǎng)絡(luò)請(qǐng)求，提高網(wǎng)站性能。 2.減少對(duì)無需更新的資源的重復(fù)傳輸，節(jié)省帶寬資源。 3.ETag可以讓服務(wù)器能夠更加精確地判斷資源的變化，避免因緩存而出現(xiàn)缺失更新等問題。 4.ETag也可以用來實(shí)現(xiàn)簡單的防重放攻擊，防止攻擊者重復(fù)發(fā)送已經(jīng)收到的報(bào)文。

Public @ 2023-03-25 23:50:19

百度站長平臺(tái)VIP俱樂部即將上線

作者：百度站長平臺(tái) 發(fā)布時(shí)間：2014年1月21日親愛的網(wǎng)站管理員，大家好，感謝大家2013年對(duì)百度站長平臺(tái)的支持，在大家的支持和關(guān)注下，站長平臺(tái)成功舉辦了多場(chǎng)高端站長沙龍，成立了站長學(xué)院并推出了多種站長工具幫助站長更好的運(yùn)營網(wǎng)站。2014年為了給優(yōu)質(zhì)網(wǎng)站提供更好的指導(dǎo)及工具上的服務(wù)，百度站長平臺(tái)即將上線VIP俱樂部，為VIP會(huì)員提供更多的福利

Public @ 2016-09-30 16:07:40

【移動(dòng)紅黑榜】APP虛假下載黑榜站點(diǎn)公布

親愛的站長管理員：近日，百度站長平臺(tái)發(fā)布了百度移動(dòng)搜索將對(duì)欺詐下載行為進(jìn)行清理和懲罰的公告，緊隨其后，本期百度站長平臺(tái)【移動(dòng)紅黑榜】，針對(duì)欺詐和誘導(dǎo)用戶下載非目標(biāo) APP的網(wǎng)站行為，篩選出典型性案例，發(fā)布新一期黑榜如下：建議有相同作法的網(wǎng)站盡快進(jìn)行整改！百度站長平臺(tái)移動(dòng)紅黑榜上線5期以來，分別針對(duì)廣告遮擋主體內(nèi)容、閱讀障礙、視頻無法播放、版式錯(cuò)位等移動(dòng)端影響用戶體驗(yàn)的問題，推出了紅榜、黑榜，以案例

Public @ 2014-02-06 16:06:29

ETag使用效果對(duì)比&;經(jīng)驗(yàn)分享

提起向百度提交數(shù)據(jù)，大家基本都會(huì)想到sitemap，最近又推出的ETag是什么東東？真的能有效果嗎？其實(shí)在ETag推出之初，我們平臺(tái)的非技術(shù)人員對(duì)效果也是沒有預(yù)期的，于是請(qǐng)智聯(lián)招聘SEO負(fù)責(zé)人桃李重點(diǎn)關(guān)注數(shù)據(jù)變化，就是希望能給各位同學(xué)看到最真實(shí)的效果。sitemap是解決網(wǎng)站收錄至關(guān)重要的途徑之一，而通常sitemap的更新都不是很及時(shí)，并且體量都相對(duì)較大，，此時(shí)也消耗了相應(yīng)的網(wǎng)站流量及帶寬。而E

Public @ 2016-07-31 16:09:45

頭條搜索站長平臺(tái)-sitemapindex文件要求

sitemapindex文件根節(jié)點(diǎn)必須是<sitemapindex>。sitemapindex文件編碼必須為UTF-8，第一行為: <?xml version="1.0" encoding="utf-8" ?>。sitemapindex文件禁止使用命名空間，禁止使用規(guī)定之外的屬性。sitemapindex文件大小不得超過5M，site

Public @ 2013-06-03 16:09:47

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基本文件流程錯(cuò)誤 SQL 調(diào)試

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[ DB ] CONNECT:[ UseTime:0.028238s ] mysql:dbname=briline.net;host=106.14.77.182;port=3306;charset=utf8
[ SQL ] SHOW COLUMNS FROM `ob_article` [ RunTime:0.019987s ]
[ SQL ] SELECT * FROM `ob_article` WHERE `id` = 6318 LIMIT 1 [ RunTime:0.018978s ]
[ 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:0.019327s ]
[ 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:0.019720s ]
[ 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:0.020346s ]
[ 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` = 6318 LIMIT 1 [ RunTime:0.019108s ]
[ 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=6318 [ RunTime:0.020238s ]
[ 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:0.026266s ]
[ 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:0.048247s ]
[ 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Sitemap' AND `status` <> -1 LIMIT 1 [ RunTime:0.026867s ]
[ 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Sitemap' AND `status` <> -1 ORDER BY rand() LIMIT 0,2 [ RunTime:0.036441s ]
[ 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', ) ]

0.514276s

Categories

Tags

什么是ETag？ETag作用有哪些

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頭條搜索站長平臺(tái)-sitemapindex文件要求

更多您感興趣的搜索

Categories

Tags

什么是ETag？ETag作用有哪些

百度站長平臺(tái)VIP俱樂部即將上線

【移動(dòng)紅黑榜】APP虛假下載黑榜站點(diǎn)公布

ETag使用效果對(duì)比&;經(jīng)驗(yàn)分享

頭條搜索站長平臺(tái)-sitemapindex文件要求

更多您感興趣的搜索

什么是ETag？ETag作用有哪些