title: nginx proxy all traffic to remote nginx
body: <p>I have 2 servers,</p>
  <ol>
  <li><p>with IP xx.xx.xx.xx, situated in Germany ... (running frontend: nginx(static content), backend: Apache2)</p>
  </li>
  <li><p>with IP yy.yy.yy.yy, situated in Italy...</p>
  </li>
  </ol>
  <p>All requests at the moment is sending to server with IP xx.xx.xx.xx,
  <strong>How can I proxy all traffic from xx.xx.xx.xx to yy.yy.yy.yy using nginx ...</strong></p>
  <pre><code>          request                           proxy, request
  Internet     -&gt;       xx.xx.xx.xx(nginx)         -&gt;             yy.yy.yy.yy(nginx, Apache)
               &lt;-                                  &lt;-
            response                          proxy, response
  </code></pre>