nginx port for socket.io

[mrblah]

I have a node application that uses websockets. I'm using a custom config
file like this. However, when I post to the application, the post isn't
appearing in the client side of the application.  Since it's using
websockets to communicate between client and server, i'm wondering if I have
a problem with the port numbers. You can see in my config that the server is
listening on 80, but the proxy_pass is set to localhost:3000.  Should these
numbers be the same? if so can I set Nginx to listen on 3000?

/etc/nginx/conf.d/domainame.com.conf

server {
    listen 80;

    server_name your-domain.com;

    location / {
        proxy_pass http://localhost:3000;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_cache_bypass $http_upgrade;
    }
}

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,246293,246293#msg-246293