Bernard Spil added the comment:

Checking if the method is actually defined is the smart way to go

>From include/openssl/tls1.h
# define TLSEXT_TYPE_application_layer_protocol_negotiation

So #ifdef TLSEXT_TYPE_application_layer_protocol_negotiation
would show you if the feature is available regardless of the implementation 
(Open|Boring|Libre)SSL

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue23329>
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