docs: def _validate_input_data(self, data, request):
          """ Validate input data.
  
          :param request: the HTTP request
          :param data: the parsed data
          :return: if validation is performed and succeeds the data is converted
                   into whatever format the validation uses (by default Django's
                   Forms) If not, the data is returned unchanged.
          :raises: HttpStatusCodeError if data is not valid
          """
  
          validator = self._get_input_validator(request)
          if isinstance(data, (list, tuple)):
              return map(validator.validate, data)
          else:
              return validator.validate(data)