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RFC 8448

An official document that walks through a complete example TLS 1.3 connection, byte by byte, for testing.

RFC 8448 provides fully worked-out example traces of TLS 1.3 handshakes, including every intermediate secret and message. Because it publishes the exact expected bytes, implementers use it as a verification target: run your code on the same inputs and check you produce the identical output. Matching it is strong evidence your TLS implementation is correct.