code: def process_exception(self, request, exception):
          
          log_format = self._get_log_format(request)
          if log_format is None:
              return
  
          params = self._get_parameters_from_request(request, True)
          params['message'] = exception
          params['http_status'] = '-'
  
          self.OPERATION_LOG.info(log_format, params)
docs: Log error info when exception occurred.