Speed things up using lazy token refresh #5
Description
Currently, the client requests new tokens from the server every time a request needs to be made to simplify things. However, this can slow the application by a lot.
The measure that can be taken against this is just to request the information with the current token. The server would let us know that it is expired, and then we can request new tokens and then re-send the request.
This will speed things up in the general case, but make things worse in the worst case. The worst case is rare, however (waiting 5 minutes before making the next request), so this should be fine.