code: func restoreValidationErrors(req *Request) ([]*ValidationError, error) {
  	var (
  		err    error
  		cookie ServerCookie
  		errors = make([]*ValidationError, 0, 5)
  	)
  	if cookie, err = req.Cookie(CookiePrefix + "_ERRORS"); err == nil {
  		ParseKeyValueCookie(cookie.GetValue(), func(key, val string) {
  			errors = append(errors, &ValidationError{
  				Key:     key,
  				Message: val,
  			})
  		})
  	}
  	return errors, err
  }
docs: // Restore Validation.Errors from a request.