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DoH broken on knot-resolver 6.x

Basically all 6.x versions are affected (>= 6.0.2). Very basic DoH does work apparently OK, but e.g. setup from Firefox or Chrome is unusable due to lots of timeouts.

I found a simple reproducer (assuming it's not cached):

yes 'nic.cz A' | head -n 2 | dnsperf -m doh -s ::1
Edited by Vladimír Čunát
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