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#rfc9460

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#RFC9460 defines the 'alpn', 'no-default-alpn', 'port', 'ipv4hint' and 'ipv6hint', and 'mandatory' SvcParamKeys. In addition, there's the 'ech' SvcParamKey for Encrypted Client Hello.

The 'mandatory' and 'no-default-alpn' are virtually unused: out of almost 10 million HTTPS records, I found exactly one instance of the 'mandatory' parameter, and 3 instances of 'no-default-alpn'.

Hey, so #RFC9460 HTTPS/SVCB records are neat, right?

They...
- speed up your time-to-first-packet (by basically stuffing the Alt-Svc HTTP header / ALPN TLS extension into the #DNS);
- let you do redirection on the zone apex without using CNAMEs;
- allow for simple DNS load distribution and failover;
- obviate HSTS and the cumbersone preloading process;
- enable stronger privacy protections via Encrypted Client Hello aka #ECH