private void handleNoOriginSelected() {
        StatusCategoryUtils.setStatusCategory(context, ZuulStatusCategory.SUCCESS_LOCAL_NO_ROUTE);
        startedSendingResponseToClient = true;
        zuulResponse = new HttpResponseMessageImpl(context, zuulRequest, 404);
        zuulResponse.finishBufferedBodyIfIncomplete();
        invokeNext(zuulResponse);
    }
Override to track your own request stats.
zuul-core/src/main/java/com/netflix/zuul/filters/endpoint/ProxyEndpoint.java