[utopkara]

A client template library for REST API need to be Turing complete, otherwise it will be too weak to be able to handle complex services or complex client-side tasks, such as caching, dependency relations, data that span multiple services etc. Even if you make the template library simple, you'll need to wrap that with a layer of complex code. All you've done will be adding another layer on your code. You could re-design your code to fit a manageable design, but server side of the REST APIs are usually design by others whose priority is the code on the server side. So, by definition of the very task, the REST API client code have to be a complex soup where the client considerations mix up with those of the servers'.