"test"; },
        {},
        "text/plain;charset=UTF-8",
        'String request has correct default Content-Type of "text/plain;charset=UTF-8"'
      )
      request(
        function _String() { return "test()"; },
        {"Content-Type": "text/javascript;charset=ASCII"},
        "text/javascript;charset=UTF-8",
        "String request keeps setRequestHeader() Content-Type, with charset adjusted to UTF-8"
      )
      request(
        function _XMLDocument() { return new DOMParser().parseFromString("<