DoH de Stéphane Bortzmeyer: https://doh.bortzmeyer.fr/
Autres serveurs :
https://github.com/curl/curl/wiki/DNS-over-HTTPS#publicly-available-servers
https://dnsprivacy.org/wiki/display/DP/DNS+Privacy+Public+Resolvers#DNSPrivacyPublicResolvers-DNS-over-TLS(DoT)
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