const crypto/tls.extensionALPN

8 uses

	crypto/tls (current package)
		common.go#L114: 	extensionALPN                    uint16 = 16
		handshake_messages.go#L235: 			echOuterExts = append(echOuterExts, extensionALPN)
		handshake_messages.go#L237: 			exts.AddUint16(extensionALPN)
		handshake_messages.go#L569: 		case extensionALPN:
		handshake_messages.go#L762: 		exts.AddUint16(extensionALPN)
		handshake_messages.go#L912: 		case extensionALPN:
		handshake_messages.go#L1009: 				b.AddUint16(extensionALPN)
		handshake_messages.go#L1061: 		case extensionALPN: