Forum: NGINX Problem with rewrite or internal redirection cycle

Hello

I have recently moved my website from Litespeed to nginx. I had to
change some lines in my PHP script to use x-sendfile function and
because of it I also had to change my nginx config. Unfortunately, when
I'm executing my PHP script, I receive 500 Internal Server Error. My
error.log says:


2012/07/18 17:39:52 [error] 23510#0: *20011855 rewrite or internal
redirection cycle while internal redirect to "/index.php", client:
31.175.62.69, server: modbase.pl, request: "GET [...]

I'm not sure what's causing this problem and how to fix it and I really
need your help.

My nginx website's config:
server {
        listen 80;
        server_name modbase.pl;
        server_name_in_redirect off;
        client_max_body_size 1024m;
        access_log /home/log/nginx/localhost.access_log;
        error_log /home/log/nginx/localhost.error_log;
        send_timeout 180;
        root /home/modbase.pl/public_html;
        index index.php;
        # Support Clean (aka Search Engine Friendly) URLs
        location / {
        client_max_body_size 1024m;
        try_files $uri $uri/ /index.php?q=$uri&$args;
        proxy_read_timeout 120;
        send_timeout 180;
        autoindex on;
        }

        index index.php index.html index.htm default.html default.htm;
        # deny running scripts inside writable directories
        location ~*
/(images|cache|media|logs|tmp)/.*\.(php|pl|py|jsp|asp|sh|cgi)$ {
                return 403;
                #error_page 403 /403_error.html;
        }

        location ~ .*.php$ {
            include /etc/nginx/fastcgi_params;
fastcgi_connect_timeout 320;

fastcgi_read_timeout 320;
client_max_body_size 1024m;
            fastcgi_pass  127.0.0.1:9000;
            fastcgi_index index.php;
            include fastcgi_params;
send_timeout 180;
            fastcgi_param SCRIPT_FILENAME
/home/modbase.pl/public_html$fastcgi_script_name;
        }

location /downloads {
internal;
}

        # caching of files
        location ~* \.(ico|pdf|flv)$ {
                expires 1y;
        }

        location ~* \.(js|css|png|jpg|jpeg|gif|swf|xml|txt)$ {
                expires 14d;
        }

}

My PHP script snippet that uses x-sendfile:

$filename_directoo = '/'.$cat_dir.'/'.$file_url;
header("X-Accel-Redirect:".$filename_directoo);
header('Content-Disposition: attachment; filename="'.$filename.'"');

Posted at Nginx Forum: 
http://forum.nginx.org/read.php?2,228698,228698#msg-228698

Hello!

On Wed, Jul 18, 2012 at 11:55:49AM -0400, drakerc wrote:

> redirection cycle while internal redirect to "/index.php", client:
> 31.175.62.69, server: modbase.pl, request: "GET [...]
>
> I'm not sure what's causing this problem and how to fix it and I really
> need your help.

Your config with your script produce an infinite loop.  Most likely
it's due to fact that after X-Accel-Redirect request ends up in
location /, and then redirected to /index.php as file isn't found,
and then again after X-Accel-Redirect request ends up in location
/ and so on.

>         location / {
>         client_max_body_size 1024m;
>         try_files $uri $uri/ /index.php?q=$uri&$args;

[...]

> location /downloads {
> internal;
> }

[...]

> My PHP script snippet that uses x-sendfile:
>
> $filename_directoo = '/'.$cat_dir.'/'.$file_url;
> header("X-Accel-Redirect:".$filename_directoo);
> header('Content-Disposition: attachment; filename="'.$filename.'"');

It looks like "location /downloads" was added to avoid the above
loop, but you don't refer it in X-Accel-Redirect.

Maxim Dounin