uestHeader() Content-Type, with charset adjusted to UTF-8"
      )
      request(
        function _Blob() { return new Blob(["test"]); },
        {"Content-Type": ""},
        "",
        'Blob request respects setRequestHeader("") to be specified'
      )
      request(
        function _Blob() { return new Blob(["test"]); },
        {},
        undefined,
        "Blob request with unset type sends no Content-Type without setRequestHeader() call"
      )
      request(
        function _Blob() { return n