ping -c 3 rails.dev
PING rails.dev (127.0.0.1): 56 data bytes
64 bytes from 127.0.0.1: icmp_seq=0 ttl=64 time=0.049 ms
64 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.206 ms
64 bytes from 127.0.0.1: icmp_seq=2 ttl=64 time=0.291 ms

worker_processes  1;

    error_log  /usr/local/etc/nginx/logs/error.log debug;

    events {
        worker_connections  1024;
    }

    http {
            include             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  /usr/local/etc/nginx/logs/access.log  main;
            sendfile            on;
            keepalive_timeout   65;
            index index.html index.php;
            include /servers/*;
    }

server {
      listen       80;
      server_name  localhost;
      client_max_body_size 4G;
      keepalive_timeout 5;

      location / {
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header Host $http_host;
        proxy_pass_header X-Accel-Redirect;
        proxy_read_timeout 300s;
        if (!-f $request_filename) {
          proxy_pass   http://127.0.0.1:3001;
          break;
        }
      }
    }