Nginx try_files $query_string 为空的解决办法

server {
listen 80;
server_name localhost.dev;
index index.php index.html index.htm;
set $root_path '/var/www/phalcon/public';
root $root_path;
location / {
try_files $uri $uri/ /index.php;
}
location ~ \.php$ {
try_files $uri =404;
fastcgi_split_path_info ^(.+\.php)(/.+)$;
fastcgi_pass 127.0.0.1:9000;
fastcgi_index index.php;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; include fastcgi_params;
}
location ~* ^/(css|img|js|flv|swf|download)/(.+)$ {
root $root_path;
}
location ~ /\.ht {
deny all;
}
}

try_files $uri $uri/ /index.php;

try_files $uri $uri/ /index.php?$query_string;