SSL_get0_alpn_selected
SSL_get0_alpn_selected(s, &proto, &proto_len);
void SSL_get0_alpn_selected(const SSL *ssl, const unsigned char **data,
SSL_get0_alpn_selected(qtls->args.s, &alpn, &alpnlen);
SSL_get0_alpn_selected(client.ssl, &proto, &proto_len);
SSL_get0_alpn_selected(server.ssl, &proto, &proto_len);
SSL_get0_alpn_selected(client, &client_proto, &client_proto_len);
SSL_get0_alpn_selected(server, &server_proto, &server_proto_len);
SSL_get0_alpn_selected(clientssl, &prot, &protlen);