Amazon has released a new API, the AppStream API, which allows you to programmatically manage apps hosted on the Amazon AppStream platform. For this API, they chose to build it with the HAL media type. HAL is a minimalist hypermedia enabled media type for building machine-to-machine APIs. Amazon is one of the largest organizations to choose hypermedia as a technique for a public-facing product.
In this article Stu Charlton examines the various options available for versioning RESTful services which he prefaces by saying “These can be tricky concepts to describe, and I don't really want to write a small book on this topic”.