docs: function restifyRequestFinishHandler(client, config, req, res) {
    var em;
  
    if (res._body instanceof Error ||
        res.statusCode > 309 && res.statusCode < 512) {
      em = new ErrorMessage().consumeRequestInformation(
          expressRequestInformationExtractor(req, res));
  
      restifyErrorHandler(client, config, res._body, em);
    }
  }