public Response request(Request request) throws NacosException {
        return request(request, rpcClientConfig.timeOutMills());
    }
@Test
    void testRequestWithoutAnyTry() throws NacosException {
        assertThrows(NacosException.class, () -> {
            when(rpcClientConfig.retryTimes()).thenReturn(-1);
            rpcClient.request(null);
        });
    }