CP(CFG_REPLY) =
  INTERNAL_IP6_ADDRESS(2001:db8:0:1:2:3:4:5/64)
  ENCDNS_IP6(1, 1, 15,
                (2001:db8:99:88:77:66:55:44),
                "doh.example.com",
                (alpn=h2 dohpath=/dns-query{?dns}))
  ENCDNS_DIGEST_INFO(0, SHA2-256,
                        8b6e7a5971cc6bb0b4db5a71...)