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Turn Homer into a DoH comprehensive testing tool

IWBNI to be able to test the compliance of a DoH resolver in one command. A sort of Zonemaster for DoH. Among the things that could be tested:

  • support of GET and POST (some DoH resolvers don't support GET)
  • reaction to unspecified methods like HEAD (some DoH resolvers timeout)
  • reaction to broken requests
  • handling of MIME types (for instances requests with the wrong type)
  • certificate and TLS "quality" (but SSLlabs.com already does it)

It would probably requires refactoring: moving the DoH test to a separate subroutine with parameters and have an option to run the test with many options.