Mode

No attempt to request user authorization interactively (via a browser) is made in this mode. The flow succeeds only if valid credentials from the previous session are available. This can be used on app start-up to check if the user is logged in or has access to a resource already.

When in this mode it is expected that the user code monitors the state of the client and helps it in getting permission from the user by presenting them a browser, etc (see the class description).