问带有Symfony 4的Ajax

EN

$(function() {
    $('#sortable').sortable({
        axis: 'y',
        opacity: 0.7,
        update: function(event, ui) {
            var list_sortable = $(this).sortable('toArray').toString();

            $.ajax({
                url: 'path(app_bundle_route)',
                type: 'POST',
                dataType: 'json',
                data: {list_order:list_sortable},
                success: function(data) {
                    console.log("xyxy");
                }
            });
        }
    });
});

/**
  * @Route("/admin/pages/reorder", name="admin_pages_reorder")
  * @return \Symfony\Component\HttpFoundation\Response
 */
 public function reorder(Request $request):Response
 {
   var_dump($request->getContent());
   die;
 }