func net/url.validOptionalPort

4 uses

	net/url (current package)
		url.go#L634: 		if !validOptionalPort(colonPort) {
		url.go#L662: 		if !validOptionalPort(colonPort) {
		url.go#L794: func validOptionalPort(port string) bool {
		url.go#L1203: 	if colon != -1 && validOptionalPort(host[colon:]) {