301 替换 404

apache写法：

RewriteEngine OnRewriteBase /RewriteCond %{REQUEST_FILENAME} !-fRewriteCond %{REQUEST_FILENAME} !-dRewriteRule ^(.*)$ / [R=301,L]

?

nginx写法：

if (!-f $request_filename){set $rule_0 1$rule_0;}if (!-d $request_filename){set $rule_0 2$rule_0;}if ($rule_0 = "21"){rewrite ^/(.*)$ / permanent;break;}