Nginx proxy for nodejs

default.conf

server {
  listen 80 default_server;
  listen [::]:80 default_server ipv6only=on;
  server_name localhost;
  access_log off;
  error_log off;
  client_max_body_size 30M;

  location ~* ^.+\.(jpg|jpeg|gif|png|ico|css|zip|tgz|gz|rar|bz2|pdf|txt|tar|wav|bmp|rtf|js|flv|swf|html|htm|json|otf|eot|svg|ttf|woff|woff2)$ {
    root   /home/ubuntu/app/public;
  }

  location ~ \.(asp|aspx|php|jsp|cgi|cgii|pl|py|exe|dll|msi)$ {
    return 410;
  }

  location ~ /TWiki|WebHome|cgi-bin|portal|foswiki|spywall|setseed-hub|pma|mysql|sql/ig {
    return 410;
  }

  location / {
    proxy_http_version 1.1;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwared-For $proxy_add_x_forwarded_for;
    proxy_set_header Host $http_host;
    proxy_set_header X-NginX-Proxy true;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "upgrade";

    proxy_pass http://127.0.0.1:4321/;
    proxy_redirect off;

    proxy_connect_timeout       600;
    proxy_send_timeout          600;
    proxy_read_timeout          600;
    send_timeout                600;
  }
}