%{xxx}t</code> tokens to the pattern, one can
    also log both timestamps.</p>

    <p>The shorthand pattern <code>pattern="common"</code>
    corresponds to the Common Log Format defined by
    <strong>'%h %l %u %t "%r" %s %b'</strong>.</p>

    <p>The shorthand pattern <code>pattern="combined"</code>
    appends the values of the <code>Referer</code> and <code>User-Agent</code>
    headers, each in double quotes, to the <code>common</code> pattern.</p>

    <p>When Tomcat is operating behind a reverse pr