Sil
    -> css
    -> js
    -> clients
         -> index.php
         -> response.php
    index.php

http://localhost/Sil/clients/
http://localhost/Sil/clients/all/
http://localhost/Sil/clients/stackoverflow/2
http://localhost/Sil/clients/stackoverflow/2/technology/5

$.ajax({
   url : 'response.php?type=add',
});

http://localhost/Sil/clients/all/response.php?type=add

$.ajax({
   url : 'http://localhost/Sil/response.php?type=add',
});

$.ajax({
    url : '/Sil/clients/response.php?type=add',
});

<base href="http://localhost/Sil/clients/" />
<script>
    $.ajax({
        url : 'response.php?type=add',
    });
</script>