docs: function errorHandler(error, req, res, next) {
      req.body.email = '';
      req.body.subscribed_url = santizeUrl(req.body.subscribed_url);
      req.body.subscribed_referrer = santizeUrl(req.body.subscribed_referrer);
  
      if (error.statusCode !== 404) {
          res.locals.error = error;
          return _renderer(req, res);
      }
  
      next(error);
  }