router.go
func (rm *routeMap) getLeaf(method, pattern string) *Leaf {
	rm.lock.RLock()
	defer rm.lock.RUnlock()

	return rm.routes[method][pattern]
}
func (rm *routeMap) getLeaf(method, pattern string) *Leaf {
	rm.lock.RLock()
	defer rm.lock.RUnlock()

	return rm.routes[method][pattern]
}
// getLeaf returns Leaf object if a route has been registered.