How is your company's service started on the loopback interface? You bundle a web server that is installed alongside a native app?

This how many of them work for transporting vs traditional old way of registering url scheme and requiring user interacts --- Discord, Blizzard net, Riot Client ... all localhost listener's that can interact

Roughly, yes. Customers (or more often, their IT department) runs our installer which installs the server as a windows service.