XFR-over-TLS (XoT): Spec requires client and server MUST use `dot` ALPN and TLS 1.3
As part of implementing #1784 per the spec, the XoT spec requires that the
dot ALPN MUST be used for XoT connections and also that TLS 1.3 or later is required. This seems it will require extension to the
tls clause with an ALPN field and implementation of the
protocol field on client and server side.
Updates by a team member
The issue basically consists of two: