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什么是ETag？ETag作用有哪些

ETag（Entity Tag）是HTTP协议中的一个头部字段，用于标识资源的某个版本。 ETag的作用主要有以下几点： 1. 缓存控制：当客户端请求一个资源时，服务器可以通过ETag来判断资源是否发生了变化。如果ETag与客户端提供的If-None-Match头字段一致，说明资源没有发生变化，服务器可以返回一个304 Not Modified状态码，告诉客户端可以使用本地缓存的副本，从而节省带宽和响应时间。 2. 并发控制：当多个客户端并发请求修改同一个资源时，服务器可以使用ETag来判断客户端提交的数据是否仍然是有效的，从而避免冲突和重复提交。 3. 断点续传：当客户端请求下载一个大文件时，服务器可以在响应中包含ETag，当客户端在下载过程中中断，再次请求时可以通过包含If-Match头字段以及之前获取到的ETag来恢复下载。总的来说，ETag可以帮助服务器和客户端更有效地处理缓存和并发请求，提升系统的性能和用户体验。

Public @ 2023-07-23 06:50:22

移动网页加速器—让网站用户体验更好

会议上，MIP移动网页加速器项目组公布了移动网页加速器的新进展，目前已有5400余个站点已提交MIP改造后的页面，10亿多个移动页面已完成MIP化改造，每天有数亿MIP页面从百度点出。针对简化MIP改造难度方面，MIP各功能支持组件数量经过开发者的努力，已增加至215个，极大的简化了网站MIP改造难度，同时项目组也对改造后生效时间做了提升，MIP 组件审核平台上线，组件上线时间从1天，缩短至30分

Public @ 2009-02-27 16:06:10

在手机百度搜索“地震”之后的XR展现

据了解，除了搜索之外，百度搜索还在泛搜索领域，如教育、文博、泛娱乐等领域，集成更好的XR应用和XR产品。生态航母已经启航对于百度搜索而言，XR是一个崭新的平台，也意味着这是一个全新的生态。尽管目前XR生态的细节我们仍然不得而知，但毫无疑问，依托百度搜索的平台，以及百度所展示的雄心，在这个生态中，参与各方都将能够获得可观的回报。此次大会上，张峥就透露，百度搜索为XR生态合作伙伴给予多种合作权益——从

Public @ 2014-01-25 16:06:06

Sitemap协议类型及包含范围

Sitemap协议类型有： 1. XML Sitemap：用于向搜索引擎提交网站的网页地址，让搜索引擎更好地抓取网站内容。 2. News Sitemap：用于将新闻文章的标题和链接提交给搜索引擎，以便它们可以快速索引新闻。 3. Image Sitemap：用于提交图片的URL和相关信息，帮助搜索引擎更好地索引和展示图片搜索结果。 4. Video Sitemap：用于提交视频的URL和

Public @ 2023-06-16 05:00:31

sitemap提交后，多久能被百度抓取？

通常情况下，一般会在一天内被百度抓取，但具体时间会因网站规模、更新频率等因素而有所不同。如果您在提交 sitemap 后一周内没有看到任何变化，建议检查您的 sitemap 是否正确并重新提交。

Public @ 2023-06-10 08:00:05

更多您感兴趣的搜索

基本文件流程错误 SQL 调试

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[ DB ] CONNECT:[ UseTime:0.021306s ] mysql:dbname=briline.net;host=106.14.77.182;port=3306;charset=utf8
[ SQL ] SHOW COLUMNS FROM `ob_config` [ RunTime:0.015915s ]
[ SQL ] SELECT * FROM `ob_config` [ RunTime:0.014285s ]
[ 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:0.015667s ]
[ SQL ] SELECT `id`,`name`,`addon_list` FROM `ob_hook` [ RunTime:0.014134s ]
[ 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:0.015741s ]
[ SQL ] SELECT * FROM `ob_article` WHERE `id` = 9799 LIMIT 1 [ RunTime:0.014219s ]
[ 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:0.014645s ]
[ 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:0.014744s ]
[ 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:0.015323s ]
[ 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` = 9799 LIMIT 1 [ RunTime:0.014278s ]
[ 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=9799 [ RunTime:0.017237s ]
[ 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:0.025078s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 9541, '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:0.041858s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 9541, '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:0.020947s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 9541, '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:0.031304s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article', 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 9541, 'extra' => 'Using where; Using temporary; Using filesort', ) ]

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