Content-Type": ""},
        "",
        'FormData request respects setRequestHeader("")'
      )
      request(
        function _FormData() { return new FormData(); },
        {},
        /multipart\/form-data; boundary=(.*)/,
        'FormData request has correct default Content-Type of "multipart\/form-data; boundary=_"'
      )
      request(
        function _FormData() { return new FormData(); },
        {"Content-Type": "application/xml;charset=ASCII"},
        "application/xml;charset=ASCII",
      