In episode #109 of Mobycast, we started our discussion on how to build a massively scalable image hosting service. We talked about the general architecture and then dove deep on how to handle image uploads. But uploading is only half the solution. We also need to allow downloads of the images. Turns out, downloading is a totally different game. In this episode of Mobycast, Jon and Chris finish their two-part series on building an image hosting solution. We discuss in detail how to enable downloads of files with the help of CloudFront, a global network of edge locations that makes it easy to achieve massive scale.