Hi there. I've been using Poweramp for ages and it's a great product. Recently, I've been expanding my home lab, and I've selectively exposed certain internal stuff to the public internet behind a reverse proxy -- that proxy requires client certificates for access. So, for example, my phone can access internal websites such as Home Assistant, but non-authorized computers will be rejected before they even get the opportunity to talk to the backend service.
I'm about to do some work to set up audo playback inside my house, but it struck me that since I already have authenticated internet access to select internal devices, I could also set up streaming radio and play it back with Poweramp. (I could use a browser, but then I wouldn't be able to run the audio in the background as far as I can tell).
The problem is that, while Android supports a certificate store and provides the ability for applications to use it when connecting to things, that doesn't just happen magically for "anything connecting to https". You can see the work that would be involved with this pull request which added this functionality into Home Assistant's Android companion app: https://github.com/home-assistant/android/pull/2526
I'm hoping there's a chance you'd be willing to add something similar to Poweramp. The security benefit is definitely something that only a tech-savvy power-user would appreciate, but I'm hoping that the PR above makes it easy/accessible enough to do that it's not a big deal to add in