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                    <a href="[% c.uri_for('/cart/empty') %]">Empty cart</a>
                </td>
            </tr>
        </tfoot>

    </table>

As you can see the way that items are added into C<< $c->session->{cart} >> is
pretty simple. Since C<< $c->session >> is restored as necessary, and contains
data from previous requests by the same client, the cart can be updated as the
user navigates the site pretty transparently.

=head1 SECURITY ISSUES

These issues all relate to how session data is managed, as described above.
These are not issues you should be concerned about in your application code,
but are here for their educational value.

=head2 (Not) Trusting the Client

In order to avoid the overhead of server-side data storage, the session data can