nginx 配置增加一个固定的重写规则:配置报错 

现有配置如下，想增加 config.js -> 重写到 config.php 且不允许直接访问config.php，怎么搞哦，谢谢哈。。。
server {     listen              80;

    server_name         js.mydomain.com;

    charset             utf-8;

    set                 $root '/dat/www/js.mydomain.com/public';

    root                $root;

    add_header          Cache-Control no-cache;

    add_header          Cache-Control private;

    index               index.php index.html index.htm;

    try_files           $uri $uri/ @rewrite ;

    location @rewrite {

        rewrite ^/(.*)$ /index.php?_url=/$1;

    }

    # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000

    #

    location ~ .php$ {

        root           $root;

        fastcgi_pass   127.0.0.1:9000;

        fastcgi_index  index.php;

        fastcgi_param  PATH_INFO        $fastcgi_path_info;

        fastcgi_param  PATH_TRANSLATED  $document_root$fastcgi_path_info;

        fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;

        include        fastcgi_params;

    }

}