Machine Affinity with LiveView and fly-replay

I've been building an application to exercise some features of Phoenix/LiveView and Fly Machines. It's a button . You push the button. It makes an API call. A new virtual machine pops up on some Fly.io metal in the data centre nearest to you. Nearest, that is, to the Fly.io edge server you hit using the app's Anycast IP address. If your ISP and its BGP friends are having a bad day, your request…