TLS_PROTOCOL_TLSv1_1
proto = TLS_PROTOCOL_TLSv1_1;
.want_protocols = TLS_PROTOCOL_TLSv1_0 | TLS_PROTOCOL_TLSv1_1 |
.want_protocols = TLS_PROTOCOL_TLSv1_0 | TLS_PROTOCOL_TLSv1_1 |
.want_protocols = TLS_PROTOCOL_TLSv1_0 | TLS_PROTOCOL_TLSv1_1 |
.want_protocols = TLS_PROTOCOL_TLSv1_1 | TLS_PROTOCOL_TLSv1_2,