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This topic created in 3751 days ago, the information mentioned may be changed or developed.
要求：将 http://www.domain.com/a/xxx.html 所有 404 页面重定向到 http://www.domain.com/a/
假设 http://www.domain.com/a/c.html 是一个正常页面，则正常显示;
若 http://www.domain.com/a/test.html 返回 404 ，则重定向到 http://www.domain.com/a/
之前写的规则
RewriteEngine On
RewriteBase /
#redirect /a/xxxx to /a/
RewriteCond %{REQUEST_URI} ^/a/
##don't rewrite if the resource already exists
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond {REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ /a/ [R=301,L,NC]
出现的问题的可能在于这两句
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond {REQUEST_FILENAME} !-d
查了下资料发现这两句是将 URL 视为路径去服务器寻找相关目录 /文件，由于启用了路由规则，所以文件路径和 URL 不一样。
Refer ：
1. http://www.cnblogs.com/adforce/archive/2012/11/23/2784664.html
2. http://stackoverflow.com/questions/11906060/is-there-a-way-to-if-else-a-rewrite-in-apache-htaccess
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