title: Prevent session's last access time update in Jetty
body: <p>Is it possible to instruct a Jetty server not to update the session's last access time when a particular servlet is accessed?</p>
  
  <p>Our use case is an HTML page that sends asynchronous requests in the background every 5 miniutes to refresh its contents. The session's timeout is set to 30 minutes.
  The unfortunate problem with this configuration is that when a user leaves that page open in a browser's tab, the session never expires because the access time of the session is updated by every asynchronous request.</p>
  
  <p>For correctness' sake I have to admit that I didn't try anything yet because I wasn't able to find any help for my issue on the Internet. If what I'm asking for is not possible, I'm thinking of storing the access time in a session's variable that is controlled directly by the application. This value would have to be checked early before a request is processed (in the <code>doGet</code> and <code>doPost</code> methods of the servlets) and the session would need to be invalidated manually. Is there a better solution?</p>