Customers whose end users sit behind corporate firewalls want the web widget to load entirely from their own domain, so those users don't need Gleap domains whitelisted. Today the JS SDK can proxy its core hosts (API, WebSocket, realtime, messenger frame, banner, modal) via manual host setters, but notification sounds, attachments/media, avatars and help-center links still load from Gleap hosts, and there is no dashboard setting for a widget custom domain (custom domains cover only help center and feedback portal).