alpn A set of supported Application-Layer Protocol Negotiation values. Declarationvar alpn: [String] { get set } See AlsoCustomizing Connection Optionsinit(alpn:)init()idleTimeoutinitialMaxDatainitialMaxStreamDataBidirectionalLocalinitialMaxStreamDataBidirectionalRemoteinitialMaxStreamDataUnidirectionalinitialMaxStreamsBidirectionalinitialMaxStreamsUnidirectionalmaxDatagramFrameSizemaxUDPPayloadSizesecurityProtocolOptions