Wobserver as a Plug behind proxy

[iboard]

I'm using wobserver in a Phoenix-Application (configured as plug).
Locally everything works just fine but when I run the application on the production server, I have the following problem:

• App is running on port 4000
• NGINX-Proxy listens on https://...., signs the communication and uses proxy_pass localhost:4000 to hit the application.
• Wobserver starts fine at https://..../metrics but then can't connect the websocket because it is still a ws instead of wss transport.

It seems there is no way yet to configure wss, right?