swf path in datatable not found at all

I am using this code to load dataTable and tabletools:

  <script src="//cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
  <script src="//cdnjs.cloudflare.com/ajax/libs/datatables/1.10.5/js/jquery.dataTables.min.js"></script>
  <script src="//cdn.datatables.net/tabletools/2.1.5/js/TableTools.min.js"></script>

And initializing like this:

$(document).ready(function () {
  $('.table').DataTable({
    "dom": 'T<"clear">lfrtip',
    "tableTools": {
      "sSwfPath": "//cdn.datatables.net/tabletools/2.1.5/swf/copy_csv_xls.swf"
    },
 });
});

The problem is that the copy_csv_xls.swf is not being found, according to my console:

 GET https://localhost:3000/admin/media/swf/copy_csv_xls_pdf.swf 404 (Not Found)

I don't know why is trying to find in media/swf/, i try create this path but still not working.