code: def _process_response(self, request, response):
          
          log_format = self._get_log_format(request)
          if not log_format:
              return response
  
          params = self._get_parameters_from_request(request)
          # log a message displayed to user
          messages = django_messages.get_messages(request)
          result_message = None
          if messages:
              result_message = ', '.join('%s: %s' % (message.tags, message)
                                         for message in messages)
          elif 'action' in request.POST:
              result_message = request.POST['action']
          params['message'] = result_message
          params['http_status'] = response.status_code
  
          self.OPERATION_LOG.info(log_format, params)
  
          return response
docs: Log user operation.