nginx.conf

user             nginx;
worker_processes 2;
error_log        /var/log/nginx/error.log;
pid              /var/run/nginx.pid;
events {
  worker_connections 1024;
}
http {
  include           /etc/nginx/mime.types;
  default_type      application/octet-stream;
  log_format        main  '$remote_addr - $remote_user [$time_local] "$request" '
                          '$status $body_bytes_sent "$http_referer" '
                          '"$http_user_agent" "$http_x_forwarded_for"';
  access_log        /var/log/nginx/access.log main;
  sendfile          on;
  keepalive_timeout 65;

  upstream appname {
    server unix:/home/vagrant/appname/tmp/sockets/appname.socket;
  }

  server {
    listen      80;
    server_name appname;
    access_log  /var/log/nginx/appname.access.log main;
    error_log   /var/log/nginx/appname.error.log;
    root        /home/vagrant/appname/public;

    location / {
      try_files $uri $uri/index.html $uri.html @appname;
    }

    location @appname {
      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_redirect   off;
      proxy_connect_timeout 300;
      proxy_read_timeout 300;

      proxy_pass http://appname;
    }
  }
}