 <code>xxx</code></li>
    <li><b><code>%{xxx}c</code></b> write value of cookie with name <code>xxx</code></li>
    <li><b><code>%{xxx}r</code></b> write value of ServletRequest attribute with name <code>xxx</code></li>
    <li><b><code>%{xxx}s</code></b> write value of HttpSession attribute with name <code>xxx</code></li>
    <li><b><code>%{xxx}p</code></b> write local (server) port (<code>xxx==local</code>) or
        remote (client) port (<code>xxx=remote</code>)</li>
    <li><b><code>%{xxx}t</code></b>