We just released an update with dynamic backend domain detection in web applications. Prior to this update, backend domain/url was statically compiled inside web applications during build process. We always used deploy plan domain (system or custom) and included it into the bundle.
Starting from today, we added dynamic domain detection: webworker detects origin of the application (current domain of the page in browser) and uses it to send API requests to the backend. While for the most current customers who use our cloud only this changes nothing, customers who host on-premise (starting from Business subscription) got more flexibility with no need to edit web bundles before deploying to private servers.