urlx.go
func ResolveString(rawURL string) (*net.IPAddr, error) {
	u, err := Parse(rawURL)
	if err != nil {
		return nil, err
	}
	return Resolve(u)
}
func ResolveString(rawURL string) (*net.IPAddr, error) {
	u, err := Parse(rawURL)
	if err != nil {
		return nil, err
	}
	return Resolve(u)
}
// Resolve resolves the URL host to its IP address.
// It's a shortcut for Parse() and Resolve() funcs.