ameter names to a <code>String[]</code> of all
 values for that parameter (obtained by calling <code>ServletRequest.getParameterValues(String name))</code>.</li>
 <li><code>header</code> - a <code>Map</code> that maps header names to a single String header value (obtained by
 calling <code>HttpServletRequest.getHeader(String name))</code>.</li>
 <li><code>headerValues</code> - a <code>Map</code> that maps header names to a <code>String[]</code> of all values
 for that header (obtained by calling <code>HttpS