Fred Morris wrote:
> * SVCB is mostly type 65; and
>
> * the target is always null, or in other words the rdata always starts
> with x000100.
If the first two bytes are 00 01, then that is a ServiceMode HTTPS
record, and the TargetName (00) is not null, but the root owner name
("."). That is a short hand that means the effective TargetName is the
same as the owner name of the RR.
https://www.rfc-editor.org/rfc/rfc9460.html#name-servicemode-2
One of the major browser implementations apparently does not even
support the TargetName field, if I'm reading this bug report right:
https://issues.chromium.org/issues/40257146
We have an initial implementation of HTTPS-RR, but it's missing some
important cases:
[...]
* Following target names in ServiceMode records, to handle multi-CDN
use cases
--
Robert Edmonds
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