title: How to port forwarding/tunneling TCP on Nginx
body: <p>I am using nginX
  <code>nginx version: nginx/1.4.6 (Ubuntu)</code></p>
  
  <p>I have an app listening TCP on IPv4 port besides 80.
  How I can to proxy/forward from domain on TCP 80 to this port.
  What keywords should I find or nginx configurations?</p>
  
  <p>Thanks</p>