The relevant classes/functions in Qt hand DNS resolution off to the operating system. If your operating system implements DoH then you have that support, otherwise you do not. As I understand it, Apple's iOS 14 and macOS 11 and Windows 11 have the support.
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Unsolved QT Dns Over Https / DOH
General and Desktop • • Sycolmnu -
Unsolved Qt Local DNS Mapping
General and Desktop • • DannyDe