alpnProtocol
String containing the selected ALPN protocol. Before a handshake has completed, this value is always null. When a handshake is completed but not ALPN protocol was selected, tlsSocket.alpnProtocol equals false.
String containing the selected ALPN protocol. Before a handshake has completed, this value is always null. When a handshake is completed but not ALPN protocol was selected, tlsSocket.alpnProtocol equals false.