Checks whether your versions of PyOpenSSL and OpenSSL are recent enough to support protocol negotiation, and if they are, what kind of protocol negotiation is supported.

ReturnsA combination of flags from ProtocolNegotiationSupport that indicate which mechanisms for protocol negotiation are supported. (type: constantly.FlagConstant)
API Documentation for Twisted, generated by pydoctor at 2017-09-23 19:45:03.