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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

高效提交、多源获流，这一波工具权益必须得抓住

工具特型获流权益是专为工具类小程序提供的高效分发权益，开发者只需要提交小程序中工具页面的结构化信息，审核通过后即可入驻工具结构化数据库，从提交审核到线上展示最快可以半天完成。该数据库中资源将依据小程序交互体验、场景契合度等多维度评估结论，推送至含搜索寻址、搜索特型、百度APP端场景、贴吧场景等多渠道分发，实现一站式提交、多渠道分发。在数据提交之前，也许您还需要了解以下几个问题：什么是工具？我们所说

Public @ 2014-08-24 16:02:56

百度发布移动搜索建站优化白皮书

2017年11月，百度发布《百度移动搜索建站优化白皮书》（后续简称移动建站白皮书），移动建站白皮书目的在于让广大站长充分了解百度搜索引擎规则，并根据规则合理安全建设网站、优化网站，从而更好的获取搜索流量，共建良性搜索生态。《百度移动搜索建站优化白皮书》详情请点击：http://ziyuan.baidu.com/college/courseinfo?id=1689&page=1来源：百度搜索

Public @ 2020-02-08 16:05:33

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

站点地图分类

1、sitemap（sitemap.xml，sitemap.txt）这一类站点地图包含了该网站的所有连接，一般提交给爬虫去爬。让搜索引擎去收录网站内容。2、站点导航，主要是面向访问网站的用户。将网站连接分类，整理后展现在用户面前。

Public @ 2013-10-14 16:11:50

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基本文件流程错误 SQL 调试

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[ DB ] CONNECT:[ UseTime:0.000331s ] mysql:dbname=briline;host=127.0.0.1;port=3306;charset=utf8
[ SQL ] SHOW COLUMNS FROM `ob_config` [ RunTime:0.000558s ]
[ SQL ] SELECT * FROM `ob_config` [ RunTime:0.000294s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_config', 'partitions' => NULL, 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 25, 'filtered' => 100, 'extra' => NULL, ) ]
[ SQL ] SHOW COLUMNS FROM `ob_hook` [ RunTime:0.000402s ]
[ SQL ] SELECT `id`,`name`,`addon_list` FROM `ob_hook` [ RunTime:0.000186s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_hook', 'partitions' => NULL, 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 3, 'filtered' => 100, 'extra' => NULL, ) ]
[ SQL ] SHOW COLUMNS FROM `ob_article` [ RunTime:0.000490s ]
[ SQL ] SELECT * FROM `ob_article` WHERE `id` = 6460 LIMIT 1 [ RunTime:0.000272s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article', 'partitions' => NULL, 'type' => 'const', 'possible_keys' => 'PRIMARY', 'key' => 'PRIMARY', 'key_len' => '4', 'ref' => 'const', 'rows' => 1, 'filtered' => 100, 'extra' => NULL, ) ]
[ SQL ] select * from `ob_article_tongji` where category_id=12 and mark_type='cate' order by times desc limit 15 [ RunTime:0.000489s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article_tongji', 'partitions' => NULL, 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 608, 'filtered' => 1.0000001192092896, '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:0.000589s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article_tongji', 'partitions' => NULL, 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 608, 'filtered' => 1.0000001192092896, '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:0.000722s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article_tongji', 'partitions' => NULL, 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 608, 'filtered' => 1.0000001192092896, 'extra' => 'Using where; Using temporary; Using filesort', ) ]
[ SQL ] SELECT * FROM `ob_article` WHERE `id` = 6460 LIMIT 1 [ RunTime:0.000214s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article', 'partitions' => NULL, 'type' => 'const', 'possible_keys' => 'PRIMARY', 'key' => 'PRIMARY', 'key_len' => '4', 'ref' => 'const', 'rows' => 1, 'filtered' => 100, 'extra' => NULL, ) ]
[ SQL ] update `ob_article` set views=views+2 where id=6460 [ RunTime:0.004499s ]
[ 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:0.005571s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article', 'partitions' => NULL, 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 7784, 'filtered' => 0.89999997615814209, '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:0.021766s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article', 'partitions' => NULL, 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 7784, 'filtered' => 0.89999997615814209, '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:0.005433s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article', 'partitions' => NULL, 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 7784, 'filtered' => 0.89999997615814209, '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:0.016378s ]
[ EXPLAIN : array ( 'id' => 1, 'select_type' => 'SIMPLE', 'table' => 'ob_article', 'partitions' => NULL, 'type' => 'ALL', 'possible_keys' => NULL, 'key' => NULL, 'key_len' => NULL, 'ref' => NULL, 'rows' => 7784, 'filtered' => 0.89999997615814209, 'extra' => 'Using where; Using temporary; Using filesort', ) ]

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