Christian Heimes <li...@cheimes.de> added the comment:

The session code of the ssl is not compatible with TLS 1.3. Actually the whole 
API doesn't work with TLS 1.3. In TLS 1.2 and before, sessions had multiple 
security implications. For example they break PFS.

TLS 1.3 changed when sessions are exchanged and how session are resumed. 
Session data is no longer part of the handshake. Instead the server can send 
session tickets at any point after the handshake. A server can send multiple 
tickets (usually two) and tickets must only be reused once.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue34971>
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