func net/url.validOptionalPort

4 uses

	net/url (current package)
		url.go#L625: 		if !validOptionalPort(colonPort) {
		url.go#L653: 		if !validOptionalPort(colonPort) {
		url.go#L772: func validOptionalPort(port string) bool {
		url.go#L1163: 	if colon != -1 && validOptionalPort(host[colon:]) {

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