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什么是ETag？ETag作用有哪些

ETag是HTTP协议中的一个响应头部字段，用于标识HTTP请求的资源版本。一般由服务器生成，类似于一个唯一标识符，与该资源的内容相关联。ETag的值可以是任何由服务器生成的标识符，例如文件的修改时间戳、哈希值等。 ETag的主要作用有以下几个： 1. 缓存控制：当客户端请求资源时，客户端可以与服务器之间比较ETag的值来判断资源是否过期。如果ETag值相同，则表明资源没有发生变化，客户端可以使用缓存副本，否则客户端需要请求新的资源内容。 2. 并发控制：为了避免多个客户端同时访问同一个资源造成数据不一致的问题，服务器可以使用ETag来对请求进行并发控制，确保只有一个客户端可以更新资源。 3. 优化性能：服务器可以使用ETag来判断客户端请求的资源是否与服务器端保存的版本一致，在此基础上进行优化，减少不必要的数据传输。总之，ETag可以提高Web应用程序的性能，优化缓存、并发控制和资源更新机制。

Public @ 2023-03-28 23:50:29

百度智能小程序流量全景地图

抱歉，我是一名 AI 语言模型，无法提供百度智能小程序流量全景地图。

Public @ 2023-06-24 13:00:04

关于索引量，你必须知道的事

网站被Baiduspider抓取收录后，经过一系列计划才得以建入索引库，有了和搜索用户见面的机会。所以，索引量一直是站长们关注的焦点，但我们发现，依然有很多站长对索引量存在误读。于是学堂整理了一些常见问题，纠正一些错误的看法。误：站长可以通过site查询站点收录量正：索引量数据以百度搜索资源平台索引量工具为准，SITE仅为估值误：索引量增加了，流量就会多；索引量减少，流量危险正：索引量分多个层级，

Public @ 2015-01-03 15:34:46

百度搜索资源平台-sitemap全网开放及建议启用Etag的公告

尊敬的用户：为了更好地优化搜索资源平台的索引和抓取效率，提高网站页面的收录速度，我们决定将百度搜索资源平台的sitemap功能全网开放。从即日起，所有网站都可以使用sitemap协议向百度搜索推送网站的页面信息。同时，我们也建议网站在sitemap中启用Etag机制。Etag是一种用于判断网页是否发生变化的机制，在网站页面发生变动时可以通过更新Etag来通知搜索引擎重新抓取该页面，从而保持

Public @ 2023-07-26 21:00:31

ETag使用效果对比&;经验分享

ETag是一种HTTP协议中的实体标签，用于标记某个资源的版本号。它在浏览器与服务器之间起到了缓存控制的作用，提高了网页的加载速度和用户的浏览体验。下面是ETag使用效果对比和经验分享： 1. 提高缓存命中率：当用户再次访问同一资源时，浏览器会向服务器发送请求，服务器会比较资源的ETag值与请求头中的If-None-Match值是否一致。如果一致，则返回状态码304 Not Modified，表

Public @ 2023-07-21 06:50:49

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[ DB ] CONNECT:[ UseTime:0.023263s ] mysql:dbname=briline.net;host=106.14.77.182;port=3306;charset=utf8
[ SQL ] SHOW COLUMNS FROM `ob_config` [ RunTime:0.016258s ]
[ SQL ] SELECT * FROM `ob_config` [ RunTime:0.015549s ]
[ 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:0.016144s ]
[ SQL ] SELECT `id`,`name`,`addon_list` FROM `ob_hook` [ RunTime:0.015418s ]
[ 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:0.016452s ]
[ SQL ] SELECT * FROM `ob_article` WHERE `id` = 6460 LIMIT 1 [ RunTime:0.015673s ]
[ 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:0.015772s ]
[ 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:0.015859s ]
[ 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:0.015999s ]
[ 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` = 6460 LIMIT 1 [ RunTime:0.015464s ]
[ 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=6460 [ RunTime:0.016321s ]
[ SQL ] SELECT COUNT(*) AS tp_count FROM `ob_article` WHERE `category_id` = 12 AND `cate` = '威海百度搜索资源平台' AND `status` <> -1 LIMIT 1 [ RunTime:0.023081s ]
[ 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` = '威海百度搜索资源平台' AND `status` <> -1 ORDER BY rand() LIMIT 0,2 [ RunTime:0.039941s ]
[ 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:0.022597s ]
[ 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:0.032894s ]
[ 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', ) ]

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