Served by nginx from inside a pay-per-minute ephemeral sandbox container provisioned onto a real AWS worker VM (placement: custom_vm) and fronted by Traefik with a Let's Encrypt certificate.
VM: worker1 · 3.92.210.111
Sandbox: sandbox-fc7bf146-863
URL: https://worker1.sandbox.a342873947.vxai.site
Disposable, auto-expiring, publicly reachable over HTTPS.