code: def add_get(self, path, controller, template, raw=False):
          
          if raw:
              fn = controller
          else:
              fn = self._prepare_controller(controller, template)
          self.app.router.add_get(path, fn)
docs: Setup a route of type GET
  
          Args:
            path (str): URL to listen to
            controller (coroutine): the coroutine to handle the request
            template (str): the template to render the response or None if it is a JSON response
            raw (bool): indicates if post-processing (jinja, json, etc) is needed or not