We already proxy images if they are not HTTP, but:
1) This uses CPU and bandwidth (but no disk space)
2) Some networks, like ASOS, prevent downloading images in this way
3) Some networks, like ASOS, are listed as HTTP images in datafeedr but actually do have HTTPS images
So I’m going to add a new feature that when it spots an HTTP image for the first time from a new domain, it will test if HTTPS works, and if so, all future HTTP image requests will be changed to HTTPS image request rather than attempting to proxy them.