Elegant token-based API access with AngularJS

Loved this post. Though I would consider myself an intermediate Angular dev, I had a really hard time understanding how the config block was written. Will probably spend a fair amount of time reviewing the structure of the promise returns.

One question --> If a user needs to re-authorize via a login screen, let's say they login successfully and the server returns a token. How (or does) the code continue the original request?

Thanks