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Which revision of the transport security protocol a session negotiates. SSL 2 and 3 along with TLS 1.0 and 1.1 are deprecated and disabled on current news servers, leaving TLS 1.2 and 1.3 in ordinary use. Version 1.3 drops obsolete ciphers and shortens the handshake to a single round trip, which helps clients opening and closing many connections.
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