When the http.Server you'd configure this with has not received new connections for some time, the context IdleTracker implements will be done, which can be used to initiate an orderly shutdown.

Works best with systemd's socket-activated services*.

Remember inetd or xinetd? Systemd can start server instances for every incoming connection, which AcceptedConnection upgrades to a net.Listener that you can pass to http.Server.

For whenever every process needs its own ephemeral environment, or any isolation from other instances. Like code runners, such as found in CI or Godoc's “playground”.