Either run the solution in VS, or with dotnet run.
Username/password is alice/alice.
Run npm install && npm start.
Client is already configured to communicate with in-memory client defined in IDS4 with a 60 second access token.
When clicking "Stop automatic refresh" and "Start automatic refresh" a couple of times, it seems the internal timers that should be unsubscribed start running again, firing off increasing numbers of calls to the token endpoint, which breaks functionality when not re-using refresh tokens.