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404页面是什么？

404页面是客户端在浏览网页时，服务器无法正常提供信息，或是服务器无法回应，且不知道原因所返回的页面。据说在第三次科技革命之前，互联网的形态就是一个大型的中央数据库，这个数据库就设置在404房间里面。那时候所有的请求都是由人工手动完成的，如果在数据库中没有找到请求者所需要的文件，或者由于请求者写错了文件编号，用户就会得到一个返回信息：room 404 : file not found。404错误信息通常是在目标页面被更改或移除，或客户端输入页面地址错误后显示的页面，人们也就习惯了用404作为服务器未找到文件的错误代码了。当然实际考证传说中的room 404是不存在的，在http请求3位的返回码中，4开头的代表客户错误，5开头代表服务器端错误。

Public @ 2014-05-13 16:11:01

站点地图的重要性

1、搜索引擎每天都是让爬虫在互联网爬行来抓取页面，站点地图的作用就是给爬虫爬行构造了一个方便快捷的通道，因为网站页面是一层一层的链接的，其中可能会存在死链接的情况，如果没有站点地图，爬虫爬行在某个页面就因死链接爬行不了，那么就不能收录那些断链接的页面。2、站点地图的存在不仅是满足搜索引擎爬虫的查看，更多是方便网站访客来浏览网站，特别是例如门户型网站由于信息量太多很多访客都是通过站点地图来寻找到自己

Public @ 2010-08-07 16:09:53

锚文本链接是什么？

锚文本链接，简称锚文本，又叫关键词链接，是链接的一种展现形式。锚文本和超链接类似，超链接是直接链接形式，如 https://www.seowhy.com/a/227.html锚文本是给一个关键词做一个链接，指向别的网页，例子如：SEO第二个例子：学SEO需要多长时间这样可以点击的文字，就是一个锚文本。锚文本是文本关键词与URL链接整合在一起状态名称。如果给一个图片做一个链接，则叫图片

Public @ 2017-10-08 16:11:32

Apache IIS/.net 制作404页面

Apache 404 页面： 1. 创建一个名为“404.html”的文件，该文件将成为您的404错误页面。 2. 将此文件上传到您网站的根目录（或子目录，如果您希望针对特定子目录生成404页面）中。 3. 打开您网站的.htaccess文件并添加以下代码： ``` ErrorDocument 404 /404.html ``` 4. 现在，每当用户在您的网站上访问不存在的页面时，将自动重定

Public @ 2023-06-05 12:50:13

404页面是什么？

404页面是指在网站上访问某个不存在的页面时，服务器返回的错误页面。一般来说，404页面会告诉用户当前访问的页面不存在，并提供一些相关链接或搜索框，帮助用户继续浏览网站。

Public @ 2023-06-06 01:50:05

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基本文件流程错误 SQL 调试

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[ DB ] CONNECT:[ UseTime:0.030202s ] mysql:dbname=briline.net;host=106.14.77.182;port=3306;charset=utf8
[ SQL ] SHOW COLUMNS FROM `ob_article` [ RunTime:0.021115s ]
[ SQL ] SELECT * FROM `ob_article` WHERE `id` = 4513 LIMIT 1 [ RunTime:0.020298s ]
[ 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:0.020487s ]
[ 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:0.020697s ]
[ 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:0.021399s ]
[ 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` = 4513 LIMIT 1 [ RunTime:0.020375s ]
[ 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=4513 [ RunTime:0.021835s ]
[ 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:0.028283s ]
[ 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:0.040558s ]
[ 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:0.027933s ]
[ 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:0.037089s ]
[ 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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