Force the use of H3 (TLSv1.3) over DoH (DNS over Https)

[junzhli]

Since DoQ (DNS over Quic) is not supported at this moment, is it possible to explicitly force it to use H3 protocol in supported remote resolvers? Thanks!

[jedisct1]

Set http3 = true in the configuration file. HTTP/3 will be used if the server supports it.

[junzhli]

Seems like it can only handle Doh in HTTP/3 when there's a header src-alt containing h3 magic string.
I tried with [unique-id].dns.nextdns.io and it didn't work due to the above reason and ended up with using dot3.dns.nextdns.io/[unique-id], which hits the above condition.
Not sure if the issue is from NextDNS, anyways many thanks! @jedisct1

[zubrRB]

Having a problem with this when using AdGuard. AdguardTeam/CoreLibs#1892