The Tor Browser / file revision

 var timer;

 function handleRequest(request, response)

 {

   response.setHeader("Cache-Control", "no-cache", false);

   response.setHeader("Content-Type", "text/plain", false);

   response.write("Responded");

   response.processAsync();

   timer = Components.classes["@mozilla.org/timer;1"]

     .createInstance(Components.interfaces.nsITimer);

   timer.initWithCallback(function() {

       response.finish();

     // 50ms certainly be enough for one refresh driver firing to happen!

     }, 50, Components.interfaces.nsITimer.TYPE_ONE_SHOT);

 }