code: def valid_action_request(method):
      
  
      @functools.wraps(method)
      def _wrapper(self, *args, **kwargs):
          assert isinstance(self, BaseRequestHandler)
          if not self.is_request_valid:
              return self.reply_bad_request()
  
          try:
              return method(self, *args, **kwargs)
          except UserWarning as e:
              return self.reply_server_error(e)
          except Exception as e:
              return self.reply_server_error(e)
  
      return _wrapper
docs: wraps method with verification for is_request_valid