code: public static PageFlowRequestWrapper unwrap( ServletRequest servletRequest )
      {
          servletRequest = InternalUtils.unwrapMultipart( servletRequest );
          
          while ( ! ( servletRequest instanceof PageFlowRequestWrapper ) )
          {
              if ( ! ( servletRequest instanceof ServletRequestWrapper ) ) return null;
              servletRequest = ( ( ServletRequestWrapper ) servletRequest ).getRequest();
          }
          
          return ( PageFlowRequestWrapper ) servletRequest;
      }
docs: Unwrap to find the PageFlowRequestWrapper.  This method may return <code>null</code>.