title: Which rest end point call when session getting timeout in office online?
body: <p>We have integrate Office Online with our application and implement necessary rest end points in our application which are defined in Office Online documentation <a href="http://wopi.readthedocs.io/projects/wopirest/en/latest/" rel="nofollow noreferrer">WOPI REST Documentation</a> and all working fine. </p>
  
  <p>But problem is that when Access token getting timeout from office online then it will not call any rest end point.</p>
  
  <p>Is there any rest end point which intimate our application that your session getting timed out for current document?</p>