docs: def web_task(f):
      """
      Checks if the task is called through the web interface.
      Task return value should be in format {'data': ...}.
      """
  
      @wraps(f)
      def web_task_decorator(*args, **kwargs):
          jc = JobContext.get_current_context()
          if not isinstance(jc, WebJobContext):
              raise Exception(
                  "The WebTask is not called through the web interface.")
          data = f(*args, **kwargs)
          jc.add_responder(WebTaskResponder(data))
          return data['data'] if 'data' in data else ""
  
      return web_task_decorator