entry.go
func (e *Entry) GetHandler(method string) *Route {
	handler := e.handlers[method]
	if handler == nil {
		handler = e.handler
	}
	return handler
}
func (e *Entry) GetHandler(method string) *Route {
	handler := e.handlers[method]
	if handler == nil {
		handler = e.handler
	}
	return handler
}
// GetHandler returns a handler with given method.