roduction">Introduction</h3><div class="text">

  <p>A <strong>Valve</strong> element represents a component that will be
  inserted into the request processing pipeline for the associated
  Catalina container (<a href="engine.html">Engine</a>,
  <a href="host.html">Host</a>, or <a href="context.html">Context</a>).
  Individual Valves have distinct processing capabilities, and are
  described individually below.</p>

    <p><em>The description below uses the variable name $CATALINA_BASE to refer the
    bas