docs: def log_request(self, handler: web.RequestHandler) -> None:
          """Handle access log."""
          if 'log_function' in self.settings:
              self.settings['log_function'](handler)
              return
          status = handler.get_status()
          if status < 400:
              log_method = logger.info
          elif status < 500:
              log_method = logger.warning
          else:
              log_method = logger.error
          request_time = 1000.0 * handler.request.request_time()
          if request_time > 10:
              logger.warning('%d %s %.2fms',
                             status, handler._request_summary(), request_time)
          else:
              log_method('%d %s', status, handler._request_summary())