const crypto/tls.extensionALPN

7 uses

	crypto/tls (current package)
		common.go#L111: 	extensionALPN                    uint16 = 16
		handshake_messages.go#L192: 		exts.AddUint16(extensionALPN)
		handshake_messages.go#L522: 		case extensionALPN:
		handshake_messages.go#L680: 		exts.AddUint16(extensionALPN)
		handshake_messages.go#L821: 		case extensionALPN:
		handshake_messages.go#L908: 				b.AddUint16(extensionALPN)
		handshake_messages.go#L956: 		case extensionALPN: