I wrote most of the initial #DoH implementation for #Firefox back in the day. Six years ago I explained some of the internals on my blog: daniel.haxx.se/blog/2018/06/03…
thanks for sharing! Wouldn't lack of the CNAME TTLs suppor introduce the problem? I can imagine setup where there are 2 A records with huge TTLs and single CNAME with shorter TTL that is used for failover, blue/green etc...
Akkerman
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