If there is no _dns subdomain for the submitted name parameter, then _dns. (where zone is the closest name to the param with SOA record) should also be queried for an SVCB record.
if answer.Answer < 1, the Ns array already contains an array member that is the SOA record of the passed parameter
If there is no _dns subdomain for the submitted name parameter, then _dns. (where zone is the closest name to the param with SOA record) should also be queried for an SVCB record.
if answer.Answer < 1, the Ns array already contains an array member that is the SOA record of the passed parameter
https://github.com/NetworkCommons/sig0namectl/blob/33f6d1a25c535f778f7cb70f8cb06ed94c16b921/golang/sig0/doh.go#L62-L65