On a page like app.php/my_page use ajax to dispay a link (a route) generated by app.php/my_page/my_generator. The generated link will be like ./../../app.php/my_destination (which is the link to app.php/my_destination from app.php/my_page/my_generator).

But the link is displayed on app.php/my_page so we have an extra ../ and the link is wrong.