如果 URl 不存在，mod_rewrite .htaccess 会导致 500 服务器错误 [英] mod_rewrite .htaccess causing 500 server error if URl does not exist

问题描述

我刚刚开始使用 mod_rewrite，这是我用于支持多语言的基本结构化网站的方法:

I've just started using mod_rewrite, this is what I use for a quite basic structured website with multiple language support:

RewriteEngine on
ErrorDocument 404 /error404.php

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^([a-zA-Z]{2})/([^/]+)$ $2.php?lang=$1 [L]

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^([a-zA-Z]{2})/$ index.php?lang=$1 [L]

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^([a-zA-Z]{2})$ index.php?lang=$1 [L]

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^([^/]+)$ $1.php [L]

我的想法是语言在 URl 的开头指示并且需要是两个字符(a-z 或 A-Z).之后将有一个字符串指向一个 php 文件，该文件与字符串具有相同的文件名，只是附加了 .php.语言将作为 GET 变量 (?lang=en) 添加.

My idea was that languages are indicated at the beginning of the URl and need to be two characters (a-z or A-Z). After that there will be a string that refers to a php-file which has the same filename as the string, just .php attached. The language will be added as a GET-Variable (?lang=en).

所以，一个 URl 可能看起来像这样:/en/index 然后应该被重定向到 index.php?lang=en.

So, an URl could look like this: /en/index and should then be redirected to index.php?lang=en.

如果 URl 不是以语言开头，而是直接以字符串开头，则不会将 GET 变量附加到字符串.例如./index 应该是指index.php.如果没有字符串，则应使用索引作为默认值.

If the URl does not start with a language, but directly with the string, then no GET-variable will be attached to the string. E.g. /index should refer to index.php. If there is no string, then index should be used as default.

到目前为止，一切都很好.工作正常.只要我输入一个字符串(无论我是否使用 2 个字符作为语言)，该站点总是显示 500 内部服务器错误，而不是转到 error404.php.另外，如果我删除 .htaccess 中的这一行(404)，它仍然是同样的错误.

So far, so good. Works fine. Just if I enter a string (no matter if I use 2 characters for language or not), the site always shows an 500 Internal Server Error, instead of going to error404.php. Also, if I delete this line (404) in .htaccess, it is still the same error.

所以，我认为 .htaccess 中的其他行有问题导致此错误，有人知道这可能是什么吗?

So, I assume that there is something wrong with the other lines in the .htaccess that cause this error, does anybody have an idea what this could be?

非常感谢任何帮助！

推荐答案

你的规则是循环的.乍一看，它看起来像你的最后一个:

Your rules are looping. At a glance, it looks like your last one:

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^([^/]+)$ $1.php [L]

假设我有这个 URL，http://your.domain.com/blah，并且文件 blah.php 不存在.这就是正在发生的事情.

Say I have this URL, http://your.domain.com/blah, and the file blah.php doesn't exist. This is what's happening.

1. URI = blah, !-f 是真的，它不是文件
2. URI = blah, !-d 是真的，它不是目录
3. URI = blah，内部重写为blah.php
4. blah != blah.php，重写规则循环
5. URI = blah.php !-f 是真的，它不是文件
6. URI = blah.php !-d 是真的，它不是目录
7. URI = blah.php，内部重写为blah.php.php
8. blah.php != blah.php.php，重写规则循环

1. URI = blah, !-f is true, it's not a file
2. URI = blah, !-d is true, it's not a directory
3. URI = blah, internal rewrite to blah.php
4. blah != blah.php, rewrite rules loop
5. URI = blah.php !-f is true, it's not a file
6. URI = blah.php !-d is true, it's not a directory
7. URI = blah.php, internal rewrite to blah.php.php
8. blah.php != blah.php.php, rewrite rules loop

这种情况一直持续到重写引擎受够了并返回 500 服务器错误为止.

This goes on until the rewrite engine has had enough and returns a 500 server error.

您可以在此处执行以下两项操作之一:

You can do one of 2 things here:

1. 添加一个指令，使无论如何都停止所有循环，这很容易解决这类问题.但它会破坏需要循环的规则.我在你的规则中没有看到类似的东西，所以这样做是安全的(至少现在是这样).只需将此添加到您的规则的顶部:

1. Add a directive to make all looping stop no matter what, which is an easy to get around this kind of stuff. But it will break rules that require looping. I don't see anything like that in your rules so it's safe (at least for now) to do this. Just add this to the top of your rules:

RewriteCond %{ENV:REDIRECT_STATUS} 200
RewriteRule ^ - [L]

先检查一下php文件是否真的存在:

Do a pre-emptive check to see if the php file actually exists:

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME}.php -f
RewriteRule ^([^/]+)$ $1.php [L]

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