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This commit completes the support for DNS-over-HTTP(S) built on top of nghttp2 and plugs it into the BIND. Support for both GET and POST requests is present, as required by RFC8484. Both encrypted (via TLS) and unencrypted HTTP/2 connections are supported. The latter are mostly there for debugging/troubleshooting purposes and for the means of encryption offloading to third-party software (as might be desirable in some environments to simplify TLS certificates management).
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