title: Send notification from Google App Engine Task to UI
body: <p>My Google App Engine JSP needs to perform a lengthy processing so it adds the task to Task Queue, then refreshes every 30 sec waiting for task completion. How the task can let JSP know about its status? I tried to use session but it seems session objects are not shared between JSP and tasks. I tried to throw exceptions from the task in case if it fails hoping to launch error page (I did configure error-page in web.xml) but it didn't work either.   </p>