External Redirect when expecting internal redirect

Server NGINX
1

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

2

On Sun, Mar 10, 2013 at 01:30:22PM +0100, Thomas G. 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 D. [email protected]

3

Hello Francis,

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