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什么是ETag？ETag作用有哪些

ETag是HTTP頭的一部分，它是一個(gè)字符串標(biāo)識(shí)一個(gè)web資源的特定版本。它由web服務(wù)器生成，用于標(biāo)識(shí)文件的實(shí)體標(biāo)簽。ETag可以用來(lái)確定同一資源是否已被修改，這在緩存和驗(yàn)證客戶(hù)端緩存文件是否過(guò)期時(shí)很有用。ETag的作用如下： 1.緩存控制：在HTTP響應(yīng)頭部中包含ETag可以幫助瀏覽器緩存和驗(yàn)證資源。如果資源沒(méi)有發(fā)生任何改變，瀏覽器可以直接從本地緩存中獲取資源，而不需要重新從服務(wù)器獲取。 2.資源驗(yàn)證：如果瀏覽器的緩存過(guò)期或需要更新，它可以使用請(qǐng)求頭中的ETag來(lái)驗(yàn)證資源是否已被修改。如果資源沒(méi)有被修改，服務(wù)器可以發(fā)送一個(gè)響應(yīng)代碼為304的響應(yīng)，告訴瀏覽器它可以繼續(xù)使用緩存中的資源。 3.負(fù)載均衡：在使用多個(gè)Web服務(wù)器負(fù)載均衡時(shí)，ETag可以確?？蛻?hù)端的請(qǐng)求被重定向到與其之前請(qǐng)求相同的服務(wù)器。如果不使用ETag，則可能會(huì)發(fā)生客戶(hù)端請(qǐng)求一個(gè)資源，但它需要從新的服務(wù)器獲取，即使其他服務(wù)器已經(jīng)有緩存。

Public @ 2023-06-10 23:50:20

2013中國(guó)網(wǎng)站運(yùn)營(yíng)發(fā)展趨勢(shì)報(bào)告-2012年中國(guó)網(wǎng)站發(fā)展情況

盡管2012年中國(guó)經(jīng)濟(jì)增速放緩，但網(wǎng)絡(luò)行業(yè)仍然保持高速增長(zhǎng)態(tài)勢(shì)。根據(jù)《中國(guó)互聯(lián)網(wǎng)絡(luò)發(fā)展?fàn)顩r統(tǒng)計(jì)報(bào)告》顯示，截至2012年底，中國(guó)互聯(lián)網(wǎng)用戶(hù)規(guī)模達(dá)到5.03億，普及率達(dá)到38.3%，其中移動(dòng)互聯(lián)網(wǎng)用戶(hù)規(guī)模達(dá)到了3.06億，占全部互聯(lián)網(wǎng)用戶(hù)規(guī)模的61%。在這樣的背景下，網(wǎng)站運(yùn)營(yíng)的發(fā)展趨勢(shì)也呈現(xiàn)出以下幾個(gè)特點(diǎn)：一、移動(dòng)互聯(lián)網(wǎng)成為重要的運(yùn)營(yíng)渠道隨著移動(dòng)互聯(lián)網(wǎng)技術(shù)的不斷發(fā)展和普及，越來(lái)越多的用戶(hù)通過(guò)

Public @ 2023-04-23 11:00:16

百度智能小程序-百度小游戲特別規(guī)范

小游戲指選擇小程序游戲類(lèi)目并提供游戲服務(wù)的小程序。小游戲開(kāi)發(fā)者需遵守以下小游戲特別規(guī)范內(nèi)容：1. 游戲類(lèi)目選擇規(guī)范1.1 開(kāi)發(fā)小游戲，請(qǐng)選擇游戲類(lèi)目。一旦選擇了游戲類(lèi)目，該類(lèi)目將不可修改變更為其他小程序類(lèi)目。1.2 應(yīng)提供國(guó)家法律法規(guī)要求的各類(lèi)資質(zhì)文件選擇游戲類(lèi)目。1.3 不得惡意提交小游戲，不得提交涉嫌抄襲已有游戲產(chǎn)品的小游戲；不得通過(guò)簡(jiǎn)單修改游戲美術(shù)設(shè)計(jì)、視覺(jué)效果、UI、元素、素材等方式提供多

Public @ 2017-03-09 15:59:33

XML格式中，“priority”提示會(huì)影響結(jié)果排名嗎？

不會(huì)。Sitemap 中的“priority”提示只是說(shuō)明該網(wǎng)址相對(duì)于您自己網(wǎng)站上其他網(wǎng)址的重要性，并不會(huì)影響網(wǎng)頁(yè)在搜索結(jié)果中的排名。

Public @ 2012-07-30 16:11:53

關(guān)于Sitemap

百度一直致力于將優(yōu)質(zhì)內(nèi)容索引并呈現(xiàn)給搜索用戶(hù)，因此百度站長(zhǎng)平臺(tái)推出了Sitemap工具，網(wǎng)站可通過(guò)該工具將優(yōu)質(zhì)資源主動(dòng)反饋提交給百度站長(zhǎng)平臺(tái)，加強(qiáng)百度對(duì)優(yōu)質(zhì)資源的收錄，優(yōu)化收錄效果。Sitemap（即站點(diǎn)地圖）就是您網(wǎng)站上各網(wǎng)頁(yè)的列表。創(chuàng)建并提交Sitemap有助于百度發(fā)現(xiàn)并了解您網(wǎng)站上的所有網(wǎng)頁(yè)，包括百度通過(guò)傳統(tǒng)抓取方式可能找不到的網(wǎng)頁(yè)。您還可以使用Sitemap提供有關(guān)您網(wǎng)站的其他信息，如上次

Public @ 2011-06-13 16:11:59

更多您感興趣的搜索

基本文件流程錯(cuò)誤 SQL 調(diào)試

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/www/wwwroot/briline.net/app/config.php ( 11.25 KB )
/www/wwwroot/briline.net/app/database.php ( 1.41 KB )
/www/wwwroot/briline.net/thinkphp/library/think/Hook.php ( 4.76 KB )
/www/wwwroot/briline.net/app/tags.php ( 1.16 KB )
/www/wwwroot/briline.net/app/common/behavior/InitBase.php ( 8.17 KB )
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[ DB ] CONNECT:[ UseTime:0.025030s ] mysql:dbname=briline.net;host=106.14.77.182;port=3306;charset=utf8
[ SQL ] SHOW COLUMNS FROM `ob_config` [ RunTime:0.017976s ]
[ SQL ] SELECT * FROM `ob_config` [ RunTime:0.016895s ]
[ 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:0.017592s ]
[ SQL ] SELECT `id`,`name`,`addon_list` FROM `ob_hook` [ RunTime:0.016805s ]
[ 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:0.017737s ]
[ SQL ] SELECT * FROM `ob_article` WHERE `id` = 8735 LIMIT 1 [ RunTime:0.017273s ]
[ 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:0.017171s ]
[ 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:0.017344s ]
[ 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:0.017481s ]
[ 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` = 8735 LIMIT 1 [ RunTime:0.016853s ]
[ 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=8735 [ RunTime:0.020879s ]
[ 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:0.024412s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 9562, '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:0.045299s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 9562, '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:0.025927s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 9562, '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:0.034387s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 9562, 'extra' => 'Using where; Using temporary; Using filesort', ) ]

0.567242s

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Categories

Tags

什么是ETag？ETag作用有哪些

2013中國(guó)網(wǎng)站運(yùn)營(yíng)發(fā)展趨勢(shì)報(bào)告-2012年中國(guó)網(wǎng)站發(fā)展情況

百度智能小程序-百度小游戲特別規(guī)范

XML格式中，“priority”提示會(huì)影響結(jié)果排名嗎？

關(guān)于Sitemap

更多您感興趣的搜索

国产成人精品999视频&日本一区二区亚洲人妻精品&久久久精品国产99久久精&99热这里只有成人精品国产&精品国产剧情av一区二区&成人亚洲精品久久久久app&国产精品美女高潮抽搐A片

Categories

Tags

什么是ETag？ETag作用有哪些

2013中國(guó)網(wǎng)站運(yùn)營(yíng)發(fā)展趨勢(shì)報(bào)告-2012年中國(guó)網(wǎng)站發(fā)展情況

百度智能小程序-百度小游戲特別規(guī)范

XML格式中，“priority”提示會(huì)影響結(jié)果排名嗎？

關(guān)于Sitemap

更多您感興趣的搜索

什么是ETag？ETag作用有哪些

XML格式中，“priority”提示會(huì)影響結(jié)果排名嗎？