The Tor Browser / file revision

 var timer = null; // declare timer outside to prevent premature GC

 function handleRequest(request, response)

 {

   response.processAsync();

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

   for (var i = 0; i < 1000; ++i)

     response.write("Hello... ");

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

     .createInstance(Components.interfaces.nsITimer);

   timer.initWithCallback(function() {

       response.write("world.\n");

       response.finish();

     }, 10 * 1000 /* 10 secs */, Components.interfaces.nsITimer.TYPE_ONE_SHOT);

 }