class twisted.internet.ssl.ProtocolNegotiationSupport(Flags): (source)
ProtocolNegotiationSupport defines flags which are used to indicate the level of NPN/ALPN support provided by the TLS backend.
| Class Variable | NOSUPPORT | There is no support for NPN or ALPN. This is exclusive with both NPN and ALPN. |
| Class Variable | NPN | The implementation supports Next Protocol Negotiation. |
| Class Variable | ALPN | The implementation supports Application Layer Protocol Negotiation. |