code: void log(HttpRequest request,
               HttpResponse response,
               int length)
      {
          if (_requestLog!=null &&
              request!=null &&
              response!=null)
              _requestLog.log(request,response,length);
      }
docs: Log a request to the request log
  @param request The request.
  @param response The response generated.
  @param length The length of the body.