class Count(resource.Resource):
    def do_step(self, request):
        request.write("%i<br>\n" % request.count)
        request.count += 1
        if request.count > 10:
            request.finish()
            request.task.stop()

    def render_GET(self, request):
        request.count = 1
        request.task = task.LoopingCall(self.do_step, request)
        request.task.start(1.0)
        return server.NOT_DONE_YEThttp://localhost:8080/comet