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The IETF created a new DoH working group in Sept 2017 to look at how DNS messages could be sent over an existing HTTP/2 connection. As of Sept 2018 the draft https://datatracker.ietf.org/doc/draft-ietf-doh-dns-over-https/ is in in the RFC editor queue and there are several experimental implementations and deployments.  It is in the very early stages but one advantage of this approach would be  Note that with DoH it is possible to intermingle DNS and HTTP traffic on the same connection and make blocking of encrypted DNS harder. It should be noted that this draft addresses almost purely protocol issues and a follow up document on discovery and operational usage is expected. 

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