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404页面作用

1.避免出现死链接

网站设置404页面后，如果网站出现死链接，搜索引擎蜘蛛爬行这类网址得到“404”状态回应时，即知道该URL已经失效，便不再索引该网页，并向数据中心反馈将该URL表示的网页从索引数据库中删除。避免因为死链接影响网站收录。

2.提升用户体验

404页面通常为用户访问了网站上不存在或已删除的页面，服务器返回404错误页面，告诉浏览者其所请求的页面不存在或链接错误，同时引导用户使用网站其他页面而不是关闭窗口离开，消除用户的挫败感。

3.避免信任度下降

搜索引擎通过HTTP状态码来识别网页的状态。当搜索引擎获得了一个错误链接时，网站应该返回404状态码，告诉搜索引擎放弃对该链接的索引。而如果返回200或302状态码，搜索引擎就会为该链接建立索引，这导致大量不同的链接指向了相同的网页内容。结果是，搜索引擎对该网站的信任度大幅降低。很多网站存在这个问题：404页面返回的是200或302状态码而不是404状态码。

4.避免被惩罚

有些网站由于应用了一些错误的服务器配置，导致返回的是200状态码或是302状态码，虽然这些状态码对访问网站的用户没有影响，但是却会误导搜索引擎，使搜索引擎认为该页面是有效页面，从而抓取下来。如果404页面过多，就造成了大量的重复页面，很有可能被搜索引擎认为是作弊而遭到惩罚

Public @ 2023-02-01 16:11:00

robots

Robots are machines that are capable of carrying out complex tasks automatically, often in a manner similar to human beings. They can be programmed to perform a wide range of actions, from simple acti

Public @ 2023-03-29 04:50:11

如何把动态链接静态化？

这是SEO过程中最经常碰到的问题，也是必须解决的问题。因为搜索引擎喜欢静态页面。从Web服务器的角度，这个问题转变为：如何将静态化的文件名称转化成参数。如何把动态链接静态化？需要两步来处理：1、把网页上带链接的地方，都换上新的静态化链接。搜索引擎和浏览器将通过该链接来发生请求。（有些人做修改不是在网页上，而是进行动态链接向静态链接的转向，这是严重错误的）2、在httpd.conf或.htacces

Public @ 2018-01-17 16:11:05

404页面该怎么做？

404页面是指在网站中访问的页面不存在或者找不到时，服务器返回的错误页面，一般返回状态码为404。以下是404页面的制作建议： 1. 突出提示信息：应突出404错误提示信息，告知用户页面不存在，并给予建议或转到网站首页。 2. 留下联系方式：如果是用户信息输入错误导致的404页面，可以留下联系方式，方便用户与网站联系。 3. 美化页面设计：可以设计一张有趣、富有创意或者符合主题的图片作为40

Public @ 2023-06-26 03:00:15

如何将无效的URL重定向到其他页面？

很多时候，我们考虑把无效的URL比如：用户拼错的URL、不存在的URL重定向到别的网页。例如：网站的首页、404页面等。如何将无效的URL重定向到其他页面？在httpd.conf或.htaccess文件中使用ErrorDocument来捕获404 （找不到文件）错误：ErrorDocument 404 /index.htmlDirectoryIndex index.html /path/to/no

Public @ 2011-02-03 16:09:57

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基本文件流程错误 SQL 调试

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[ DB ] CONNECT:[ UseTime:0.024508s ] mysql:dbname=briline.net;host=106.14.77.182;port=3306;charset=utf8
[ SQL ] SHOW COLUMNS FROM `ob_article` [ RunTime:0.017339s ]
[ SQL ] SELECT * FROM `ob_article` WHERE `id` = 4512 LIMIT 1 [ RunTime:0.020611s ]
[ 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:0.017656s ]
[ 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:0.017334s ]
[ 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:0.017189s ]
[ 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` = 4512 LIMIT 1 [ RunTime:0.016544s ]
[ 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=4512 [ RunTime:0.017568s ]
[ SQL ] SELECT COUNT(*) AS tp_count FROM `ob_article` WHERE `category_id` = 12 AND `cate` = '威海网站结构优化' AND `status` <> -1 LIMIT 1 [ RunTime:0.023386s ]
[ 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` = '威海网站结构优化' AND `status` <> -1 ORDER BY rand() LIMIT 0,2 [ RunTime:0.040680s ]
[ 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404页面' AND `status` <> -1 LIMIT 1 [ RunTime:0.023501s ]
[ 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404页面' AND `status` <> -1 ORDER BY rand() LIMIT 0,2 [ RunTime:0.032151s ]
[ 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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