I checked and the strip communication is done ajax style through https. I don't see a problem.
I have something in mind for this, but haven't gotten around to implementing it yet. Full SSL is coming.
There's also a Go (golang) port:
https://github.com/cactus/go-camo
I'm currently using go-camo in my own feed reader and have experienced some flakiness (images fail to load sometimes).
(Also, nice work!)