As a webapp user, I want to get real-time updates from the server whenever I add, delete or move locations. The updates should happen without the need to click a "Solve" button and will contain a route connecting all locations.

Implementation details

• Real-time can be achieved with WebSockets or long polling. Both have advantages and disadvantages. I'll try implement WebSockets.
• Since UI and server are separate applications and are served by different servers (at least in development mode so far) I need to correctly set up CORS support on server (a Spring Boot application).