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Most if it is non-functional stylistic improvements, but I also fixed the error message when the client fails to log in because the server is down, and fixed the 401 rather than login redirect when you would get upon logout.
The sample now also checks the expiration of the access token each time it's used and refreshes it when necessary. Previously, the access token was only being checked at application start. This can be important if people leave the application open for over an hour which is the default token expiration.