Abort 0-RTT connection without TLS13 #388
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To analyze deployment issues more easily, this adds the backward compatibility requirement from RFC 8446 section D.3: A client that attempts to send 0-RTT data MUST fail a connection if it receives a ServerHello with TLS 1.2 or older.
kazu-yamamoto
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Having a dedicated error in case of deployment issue will allow to understand the cause more easily, i.e. without requiring to capture server hello.