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Curious, why fallback to /1.1 over /2?
by humblebee 6y ago
Curious, why fallback to /1.1 over /2?
- tialaramex 6y agoSo far as I can see they won't. Because QUIC (and thus HTTP/3) is always encrypted your fallback is always a TLS connection. Modern TLS agrees the sub-protocol to use (in this case h2 = HTTP/2) early with ALPN. If that ALPN sub-protocol isn't available that same connection just becomes HTTP/1.1 (over TLS) instead. So there's no reason to fall all the way to HTTP/1.1 without asking if HTTP/2 is available.