webhook.go
func hookName(h hookHandler) string {
	for name, handler := range handlers {
		if handler == h {
			return name
		}
	}
	return ""
}
func hookName(h hookHandler) string {
	for name, handler := range handlers {
		if handler == h {
			return name
		}
	}
	return ""
}
// hookName returns the name of the hookHanlder h.