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Class Handler(webapp2.RequestHandler):
  def get(self):
    path = jinja_environment.get_template('templates/new_console.html')
    token = channel.create_channel('some_key')
    # Deferring the task.
    deferred.defer(_task, token)
    args = {}
    args['token'] = token
    self.response.out.write(path.render(args))


def _task(token):
  FeedbackThreadModel(id='id').put()
  channel.send_message(token, 'done')

<html>
  <head>
    <script type="text/javascript" src="/_ah/channel/jsapi"></script>
    <script>
        channel = new goog.appengine.Channel('{{ token }}');
        socket = channel.open();
        socket.onmessage = onMessage;
        onMessage = function() {
            var xhr = new XMLHttpRequest();
            xhr.open('GET', '/secondpage');
            xhr.send();
        };
      </script>
  </head>