[3.7] bpo-37440: Enable TLS 1.3 post-handshake auth in http.client (GH-14448) (GH-14496)



Post-handshake authentication is required for conditional client cert authentication with TLS 1.3.


https://bugs.python.org/issue37440
(cherry picked from commit d1bd6e79da1ee56dc1b902d804216ffd267399db)


Co-authored-by: Christian Heimes <christian@python.org>


https://bugs.python.org/issue37440
4 files changed