SVCB record

RU: SVCB RR

SVCB (Service Binding) record: a DNS resource record type (RFC 9460) that publishes connection parameters — preferred protocols (e.g., HTTP/3), alternative endpoints, and ECH keys — so a client learns them in the same DNS query as the address. The HTTPS record type is a specialisation of SVCB for HTTP origins. Both modes eliminate a round trip spent probing less optimal connection options.