adguard DoH returns two values while cloudflare and google return just one

[mflannery]

In playing around with DoH i have found that adguard DNS doesn't work as well with cloudflared as cloudflare does (issue #25). In testing DoH responses I found that adguard DoH returns two values from a query where cloudflare and google return only one (using this as my troubleshooting guide - https://medium.com/@nykolas.z/troubleshooting-dns-over-https-c1e1009d3eb8):

[root@admin ~]# curl "https://dns.google.com/experimental?ct&dns=q80BAAABAAAAAAAAB2V4YW1wbGUDY29tAAABAAE" | strings
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 45 100 45 0 0 300 0 --:--:-- --:--:-- --:--:-- 298
example
[root@admin ~]# curl "https://1.1.1.1/dns-query?ct&dns=q80BAAABAAAAAAAAB2V4YW1wbGUDY29tAAABAAE" | strings
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 128 100 128 0 0 1422 0 --:--:-- --:--:-- --:--:-- 1422
example
[root@admin ~]# curl "https://dns.adguard.com/dns-query?ct&dns=q80BAAABAAAAAAAAB2V4YW1wbGUDY29tAAABAAE" | strings
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 56 100 56 0 0 339 0 --:--:-- --:--:-- --:--:-- 339
example
example

I wonder if this could be the source of my problem in issue #25 ...

Thanks!
Mike

[ameshkov]

Sorry for the late reply! The difference is that CF and Google use DNS answer compression.

We're going to enable it on our side as well soon.