How to allow websockets through a Laravel 5.8 maintenance page?

I need to allow websockets wss:// through the maintenance mode with Laravel 5.8 as:

php artisan down --allow=xxx.xxx.xx.xx




php artisan down --allow=127.0.0.1

But no luck.

Any clever ideas please? Is there a way to allow on Laravel 5.8 a protocol like wss:// ? I cannot work out why the Laravel maintenance page blocks it. As soon as it is up, the websockets work again.

Thanks

via Chebli Mohamed