NGINX Rewrite Question

Hello!

I looked at the NGINX wiki and found some examples on how to use the rewrite module for redirecting a HTTP request. I seem to have stumbled upon a problem though. The code is below.

server {
        listen          80;
        server_name     unknown-server.com;
        rewrite         ^ http://www.unknown-server.com$request_uri? permanent;
        access_log      /srv/www/unknown-server.com/logs/access.log;
        error_log       /srv/www/unknown-server.com/logs/error.log;
        root            /srv/www/unknown-server.com/public_html;

        location / {
                index   index.html index.htm index.php;
        }

        location ~ \.php$ {
                try_files       $uri =404;
                include         /etc/nginx/fastcgi_params;

                if ($uri !~ "^/img/") {
                        fastcgi_pass 127.0.0.1:9000;
                }

                fastcgi_index   index.php;
                fastcgi_param   SCRIPT_FILENAME /srv/www/unknown-server.com/public_html$fastcgi_script_name;
        }
}

When I visit unknown-server.com it will redirect to www.unknown-server.com (adding the 'www') which is exactly what I want; however the actual index.html file is not showing up but rather the default NGINX website that shows "Welcome to nginx!"

What I would like to have is a redirect of http://unknown-server.com to http://www.unknown-server.com or anything after. For example if someone visits http://unknown-server.com/forums/path/to/something NGINX will redirect it to http://www.unknown-server.com/forums/path/to/something - just adding the 'www' but keeping the path.

How can I do this?

Thanks in advance.

[NOTE]:

Right now the NGINX server has unknown-server.com set to accept both unknown-server.com and www.unknown-server.com requests. I set it back until I can fix this.