maskit opened a new issue, #10089:
URL: https://github.com/apache/trafficserver/issues/10089
> QUIC version 1 uses TLS version 1.3 or greater as its handshake
protocol. HTTP/3 clients MUST support a mechanism to indicate the
target host to the server during the TLS handshake. If the server is
identified by a domain name ([DNS-TERMS]), clients MUST send the
Server Name Indication (SNI; [RFC6066]) TLS extension unless an
alternative mechanism to indicate the target host is used.
https://www.rfc-editor.org/rfc/rfc9114.html#section-3.2-2
What to do on the server side doesn't seem to be defined, but we can
probably use `H3_GENERAL_PROTOCOL_ERROR` and close the connection if a client
does not use SNI extension.
Note that this is from H3 spec and QUIC does not require use of SNI
extension (i.e. we should do this check in `proxy/http3`).
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