code: protected InternalHttpResponse sendInternalRequest(HttpRequest request) {
      InternalHttpResponder responder = new InternalHttpResponder();
      httpResourceHandler.handle(request, responder);
      return responder.getResponse();
    }
docs: Send a request to another handler internal to the server, getting back the response body and response code.
  
  @param request request to send to another handler.
  @return {@link InternalHttpResponse} containing the response code and body.