As of now, the connection to the services is done via port 80.
Http connections via port 80 are considered insecure.

This is acceptable for test environments, but for cloud implementations or paying customers it is not, as they expect 100% security.

The service ui.gateway is the one who manages all incoming requests.
It is implemented as an Nginx server and thus, it must be configured that it must accept also https requests via port 443.