- if the HTTP request cannot be handled or if either parameter is not an instance of its
 respective <a href="../../../jakarta/servlet/http/HttpServletRequest.html" title="interface in jakarta.servlet.http"><code>HttpServletRequest</code></a> or <a href="../../../jakarta/servlet/http/HttpServletResponse.html" title="interface in jakarta.servlet.http"><code>HttpServletResponse</code></a> counterparts.</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../jakarta/servlet/Servlet.html#ser