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Misc/NEWS.d/next/Core_and_Builtins/2024-12-17-18-20-37.gh-issue-128035.JwqHdB.rst

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+TLSv1.3 post-handshake client authentication (PHA), often referred to as "mutual TLS" or "mTLS", allows TLS servers to authenticate client identities using digital certificates. This commit exposes a boolean property `ssl.HAS_PHA` to indicate whether the crypto library CPython is built against supports PHA, allowing python's test suite and consuming modules to branch accordingly.