Forum: NGINX External Redirect when expecting internal redirect

Hello,
I'm running nginx 1.2.1-2.2 on Debian Wheezy (testing). I try to obtain
the following:

Depending on the subnet accessing either rewrite internally to a cgi
script or to a static Website. For the cgi script that works perfectly
fine, for the static web site nginx always does a HTTP 301 instead of an
internal rewrite. Here is a stripped down configuration demonstrating 
the
issue:

(mini) [/etc/nginx] cat nginx.conf
user www-data;
pid /var/run/nginx.pid;

events {
        worker_connections 1024;
}

http {
        access_log /var/log/nginx/access.log;
        error_log /var/log/nginx/error.log;

        geo $site {
                127.0.0.0/8 eva;
                default blank;
        }

        server {
                listen 80;
                server_name localhost;

                root /var/www;

                location /eva {
                        internal;
                        gzip off;

                        fastcgi_param   QUERY_STRING 
$query_string;
                        fastcgi_param   REQUEST_METHOD 
$request_method;
                        fastcgi_param   CONTENT_TYPE 
$content_type;
                        fastcgi_param   CONTENT_LENGTH 
$content_length;

                        fastcgi_param   REQUEST_URI 
$request_uri;
                        fastcgi_param   DOCUMENT_URI 
$document_uri;
                        fastcgi_param   DOCUMENT_ROOT 
$document_root;
                        fastcgi_param   SERVER_PROTOCOL 
$server_protocol;

                        fastcgi_param   GATEWAY_INTERFACE       CGI/1.1;
                        fastcgi_param   SERVER_SOFTWARE 
nginx/$nginx_version;

                        fastcgi_param   REMOTE_ADDR 
$remote_addr;
                        fastcgi_param   REMOTE_PORT 
$remote_port;
                        fastcgi_param   SERVER_ADDR 
$server_addr;
                        fastcgi_param   SERVER_PORT 
$server_port;
                        fastcgi_param   SERVER_NAME 
$server_name;

                        fastcgi_param   HTTPS                   $https;

                        fastcgi_pass unix:/var/run/fcgiwrap.socket;
                        fastcgi_param SCRIPT_FILENAME 
/home/sithglan/work/scripts/web/eva.pl;
                }

                location /blank {
                        internal;
                        autoindex on;
                        autoindex_exact_size off;
                }

                location = / {
                        rewrite ^ /$site last;
                }
        }
}
(mini) [/etc/nginx] /etc/init.d/nginx restart
Restarting nginx: nginx.
(mini) [/etc/nginx] curl -I http://192.168.0.7/
HTTP/1.1 301 Moved Permanently
Server: nginx/1.2.1
Date: Sun, 10 Mar 2013 12:28:44 GMT
Content-Type: text/html
Content-Length: 184
Location: http://192.168.0.7/blank/
Connection: keep-alive

(mini) [/etc/nginx] curl -I http://192.168.0.7/
HTTP/1.1 301 Moved Permanently
Server: nginx/1.2.1
Date: Sun, 10 Mar 2013 12:28:47 GMT
Content-Type: text/html
Content-Length: 184
Location: http://192.168.0.7/blank/
Connection: keep-alive

I would like to acomplish that when 127.0.0.0/8 access the webserver the 
client
is internally redirected to eva.pl, which works, but if another ip 
address
access a website from static files is displayed, which works was well if 
I drop
the 'internal' keyword from location /blank but not using an internal 
redirect.

What do I have to change in order to make the internal rewrite for the 
files
work?

Cheers,
        Thomas

On Sun, Mar 10, 2013 at 01:30:22PM +0100, Thomas Glanzmann wrote:

Hi there,

> Depending on the subnet accessing either rewrite internally to a cgi
> script or to a static Website. For the cgi script that works perfectly
> fine, for the static web site nginx always does a HTTP 301 instead of an
> internal rewrite.

What do you expect the user to see with the static web site? As in,
what content do you wish nginx to return?

>                 location /blank {
>                         internal;
>                         autoindex on;
>                         autoindex_exact_size off;
>                 }
>
>                 location = / {
>                         rewrite ^ /$site last;
>                 }

So, the request is for "/", nginx does a rewrite (internal) to "/blank",
and that is a directory, so nginx does a redirect (external) to 
"/blank/".

That's pretty much what I expect to happen.

(Then the browser requests /blank/ and gets rejected because the
location{} is marked "internal".)

> I would like to acomplish that when 127.0.0.0/8 access the webserver the client
> is internally redirected to eva.pl, which works, but if another ip address
> access a website from static files is displayed, which works was well if I drop
> the 'internal' keyword from location /blank but not using an internal redirect.
>
> What do I have to change in order to make the internal rewrite for the files
> work?

You can use an internal rewrite to a file, provided that you actually
rewrite to a file. Here, you rewrite to a directory without including
the trailing /.

I confess I'm not sure what it is that you want to do.

Possibly setting the default in the map to "blank/" will help?

But you will have to decide what the next step for the user is.

  f
--
Francis Daly        francis@daoine.org

Hello Francis,

* Francis Daly <francis@daoine.org> [2013-03-10 13:57]:
> You can use an internal rewrite to a file, provided that you actually
> rewrite to a file. Here, you rewrite to a directory without including
> the trailing /.

I wanted to rewrite to a directory. I see my mistake now and it should
have been obvious to me, but was not.

> Possibly setting the default in the map to "blank/" will help?

Yes, it resolved my issue. Now it works perfectly fine. Thank you for
helping me out. I was searching for two hours now.

Cheers,
        Thomas