查看“Nginx的try files指令”的源代码

==基本介绍==
 <pre>
try_files最核心的功能是可以替代rewrite。

try_files

语法: try_files file ... uri 或 try_files file ... = code

默认值: 无

作用域: server location

Checks for the existence of files in order, and returns the first file that is found. A trailing slash indicates a directory - $uri /. In the event that no file is found, an internal redirect to the last parameter is invoked. Do note that only the last parameter causes an internal redirect,

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former ones just sets the internal URI pointer. The last parameter is the fallback URI and *must* exist, or else an internal error will be raised. Named locations can be used. Unlike with rewrite, $args are not automatically preserved if the fallback is not a named location. If you need args preserved, you must do so explicitly:
 
 
try_files的作用是按顺序检查文件是否存在，返回第一个找到的文件或文件夹（结尾加斜线表示为文件夹），如果所有的文件或文件夹都找不到，会进行一个内部重定向到最后一个参数。 



顺序检查文件是否存在，返回第一个找到的文件。结尾的斜线表示为文件夹 -$uri/。如果所有的文件都找不到，会进行一个内部重定向到最后一个参数。

务必确认只有最后一个参数可以引起一个内部重定向，之前的参数只设置内部URI的指向。 最后一个参数是回退URI且必须存在，否则将会出现内部500错误。

命名的location也可以使用在最后一个参数中。与rewrite指令不同，如果回退URI不是命名的location那么$args不会自动保留，如果你想保留$args，必须明确声明。

try_files $uri $uri/ /index.php?q=$uri&$args; 

常用的ci例子 
p184
try_files $uri $uri/ /index.php?$query_string;
 
    
</pre>

== 参考==

Nginx的try_files参数
http://10546390.blog.51cto.com/10536390/1754757

nginx中的try_files指令解释 http://www.nginx.cn/279.html

http://nginx.org/en/docs/http/ngx_http_core_module.html#try_files

    
[[category:nginx]] 　[[category:ops]]