twisted.internet.ssl.ProtocolNegotiationSupport(Flags) class documentationtwisted.internet.ssl
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      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. | 
Inherited from _ConstantsContainer (via Flags, Values):
| Method | __new__ | Classes representing constants containers are not intended to be instantiated. | 
| Class Method | lookupByName | Retrieve a constant by its name or raise a ValueError if 
there is no constant associated with that name. | 
  
| Class Method | iterconstants | Iteration over a Names subclass 
results in all of the constants it contains. | 
  
| Class Variable | _constantType | Specified by a _ConstantsContainer
subclass to specify the type of constants allowed by that subclass. | 
  
| Class Variable | _enumerants | A dict mapping the names of constants (eg NamedConstant
instances) found in the class definition to those instances. | 
  
Inherited from _ConstantsContainer (via Flags, Values):
| Method | __new__ | Classes representing constants containers are not intended to be instantiated. | 
| Class Method | lookupByName | Retrieve a constant by its name or raise a ValueError if 
there is no constant associated with that name. | 
  
| Class Method | iterconstants | Iteration over a Names subclass 
results in all of the constants it contains. | 
  
| Class Variable | _constantType | Specified by a _ConstantsContainer
subclass to specify the type of constants allowed by that subclass. | 
  
| Class Variable | _enumerants | A dict mapping the names of constants (eg NamedConstant
instances) found in the class definition to those instances. | 
  
Inherited from _ConstantsContainer (via Flags, Values):
| Method | __new__ | Classes representing constants containers are not intended to be instantiated. | 
| Class Method | lookupByName | Retrieve a constant by its name or raise a ValueError if 
there is no constant associated with that name. | 
  
| Class Method | iterconstants | Iteration over a Names subclass 
results in all of the constants it contains. | 
  
| Class Variable | _constantType | Specified by a _ConstantsContainer
subclass to specify the type of constants allowed by that subclass. | 
  
| Class Variable | _enumerants | A dict mapping the names of constants (eg NamedConstant
instances) found in the class definition to those instances. |