This tells nginx to forward requests to an express application listening on 127.0.0.1:9005 when the requested hostname matches pub.webjcl.* This one rests in /etc/nginx/sites-available and is symlinked from /etc/nginx/sites-enabled.

nginx-node-forward

# Define a server label which points to where we have node.js listening
upstream pub-webjcl {
         server 127.0.0.1:9005;
}

server {

        # Make site accessible from http://pub.webjcl.*
        server_name pub.webjcl.*;

        # Proxy to pub-webjcl
        location / {

                proxy_set_header X-Real-IP $remote_addr;
                proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
                proxy_set_header Host $http_host;
                proxy_set_header X-NginX-Proxy true;

                proxy_pass http://pub-webjcl;
                proxy_redirect off;
        }



        # redirect server error pages to the static page /50x.html
   
        error_page 500 502 503 504 /50x.html;
        location = /50x.html {
                root /usr/share/nginx/html;
        }

}