As of right now Google Cast uses the external URL to send the dashboard to the Google Casts. This more than likely isn’t a problem if your hass is public via port forwarding and you have nat reflection allowed, but in my case I have hass exposed via a reverse proxy and tailscale which means to stream the dashboard it is using upload/download.
I would love a way to specify an internal URL to connect to, I understand the cert has to be valid and a public DNS entry. It would be odd as having a public DNS entry, but with a private IP. That’s fine with me.
Thank you guys for the awesome project.