turn new Blob(["<xml/>"], {type : "application/xml;charset=ASCII"}); },
        {},
        "application/xml;charset=ascii", // new Blob lowercases the type argument
        "Blob request with set type uses that it for Content-Type unless setRequestHeader()"
      )
      request(
        function _Blob() { return new Blob(["<xml/>"], {type : "application/xml;charset=UTF8"}); },
        {"Content-Type": "application/xml+junk;charset=ASCII"},
        "application/xml+junk;charset=ASCII",
        "Blob reques