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by achernya 3686 days ago
The specific detail that you've noticed in the Go implementation has to do with RFC 7540, Section 9.2.2 (https://tools.ietf.org/html/rfc7540#section-9.2.2) which requires TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 for TLS 1.2 only. Deployments of the future TLS 1.3 are free to not support this cipher, if I am reading the RFC correctly.

That is to say, you're correct that server configured for a 100% on SSLLabs will not support HTTP/2, but I agree with davidben that SSLLabs is incorrect here for incetivising AES-256, particularly in CBC mode, for the 100% score.