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The DoH work (#1619) made changes to pkg/nonwriter.Writer that in hindsight were not backwards compatible; it added override for the LocalAddr() and RemoteAddr(). Instead of rolling back that PR, this PR reverts those changes and creates a DoHWriter for use in the https-server.go side of things. This was only caught in the integration test making this hard to catch, so we add a upstream_file_test.go that tries (doesn't work yet) to test this in the unit tests as well. Esp. helpful when 'git bisecting'. Fixes #1826