code: protected void invokeDelegate(
              ResourceFilter delegate, ResourceRequest request, ResourceResponse response, FilterChain filterChain)
              throws PortletException, IOException {
  
          delegate.doFilter(request, response, filterChain);
      }
docs: Actually invoke the delegate ResourceFilter with the given request and response.
  
  @param delegate the delegate ResourceFilter
  @param request the current Resource request
  @param response the current Resource response
  @param filterChain the current FilterChain
  @throws javax.portlet.PortletException if thrown by the PortletFilter
  @throws java.io.IOException if thrown by the PortletFilter