webdav servlet and session timeout

I am using the WebdavServlet in one of the file transfer application. I am running into this problem with session timeout.

I have configured the session timeout to be 120 minutes in the web.xml file for the servlet configuration.


The session timesout works as expected, the question I have is how to get the Internet Explorer know about this session timeout, and display some message in the IE client. Though the IE session times out, user is not aware of the timeout unless he/she hits the refresh button in IE.

Please give me you suggestions on how to solve the problem with webdav servlet.