errors.go
func ErrNotFound(id string) error {
	return ErrorResponse{
		Code:    http.StatusNotFound,
		Message: fmt.Sprintf("request %s not found", id),
	}
}
func ErrNotFound(id string) error {
	return ErrorResponse{
		Code:    http.StatusNotFound,
		Message: fmt.Sprintf("request %s not found", id),
	}
}
// ErrNotFound indicates a request could
// not be found by the processor.