Should be built-in in the framework
I see, so it is not supported out of the box.
We can always code ourselves this kind of things, the thing is that is pretty much common if you plan to use MVVC with a JSON backend separating the layers between user and your API.
I mean, there is no point in using this technology authenticating like in any other web framework. Sessions, cookies, that will always work, but OAuth is the way to go for integration, etc. If you have advanced requirements.
Would be nice to have a technical explanation on the topic with real scenarios and examples.