title: Listen to a different IP address
body: <p>This is my code:</p>
  
  <pre><code>var server = express();
  
  // Create the HTTP server
  http
      .createServer(server)
      .listen(80, '10.10.10.10');
  </code></pre>
  
  <p>Once the server has been started, how can I dynamically change the listened IP address, say to <code>11.11.11.11</code> instead of <code>10.10.10.10</code>. Is there an "unlisten" method?</p>