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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

百度智能小程序-服务类目

智能小程序服务类目，会随着相关政策、法律法规以及平台要求的随时变更，请开发者以界面提交所要求的材料为准，本文档仅供参考。一级类目：快递业与邮政二级类目资质快递经营快递业务的企业需提交《快递业务经营许可证》，快递企业末端网点需提供所在地邮政管理部门备案证明邮政仓储物流一级类目：教育二级类目资质培训机构需提供区、县级以上教育部门颁发的《民办学校办学许可证》教育信息服务驾校培训请上传《道路运输经营许可证

Public @ 2017-02-11 15:59:35

百度搜索资源平台-如何加入搜索合作页分润？

请前往资源合作－搜索合作页进行合作申请，如符合申请条件两周内会有BD进行联系。

Public @ 2010-02-27 16:08:09

Sitemap文件标准格式和大小说明

Sitemap文件标准格式： Sitemap文件通常是一个以XML格式编写的文本文件，其中包含URL信息和其他相关数据。Sitemap文件主要包含以下元素： 1. URL元素：用于指定页面的网址，并包含可选的数据，如最近的修改日期、相对于站点的相对权重等。 2. loc元素：为URL元素的子元素，用于指定页面的网址。 3. lastmod元素：为URL元素的子元素，用于指定页面的最近修改日期。

Public @ 2023-04-29 02:50:12

百度搜索资源平台-sitemap全网开放及建议启用Etag的公告

亲爱的网站管理员：百度站长平台即将正式全网开放sitemap权限，所有通过百度站长平台验证的网站均可以在百度站长工具的链接提交里添加网站的sitemap，而从近期sitemap全网开放会进入内测阶段，站长平台会挑选没有sitemap提交权限的站点参加内测，内测的报名入口《申请sitemap全网开放内测名额》。另外，本次sitemap全网开放，将取消由站长来设置sitemap文件更新周期的功能，而是

Public @ 2013-01-24 16:09:46

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基本文件流程错误 SQL 调试

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[ DB ] CONNECT:[ UseTime:0.022146s ] mysql:dbname=briline.net;host=106.14.77.182;port=3306;charset=utf8
[ SQL ] SHOW COLUMNS FROM `ob_config` [ RunTime:0.015575s ]
[ SQL ] SELECT * FROM `ob_config` [ RunTime:0.014783s ]
[ 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:0.015613s ]
[ SQL ] SELECT `id`,`name`,`addon_list` FROM `ob_hook` [ RunTime:0.014755s ]
[ 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:0.015729s ]
[ SQL ] SELECT * FROM `ob_article` WHERE `id` = 9799 LIMIT 1 [ RunTime:0.014792s ]
[ 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:0.015082s ]
[ 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:0.015372s ]
[ 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:0.015480s ]
[ 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:0.014768s ]
[ 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+1 where id=9799 [ RunTime:0.017186s ]
[ 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:0.021600s ]
[ 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` = '威海百度搜索资源平台' AND `status` <> -1 ORDER BY rand() LIMIT 0,2 [ RunTime:0.046800s ]
[ 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:0.021395s ]
[ 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:0.030318s ]
[ 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', ) ]

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