Upgrading Arc

Most Arc upgrades need nothing from you. When a release changes a default or a behavior that an application can rely on, it gets a page here. Each page answers the question that matters most first: does anything change for you? It then names who is affected and the one change that keeps the previous behavior when you need it.

Change	What it means for you
Secure defaults	Forwarded identity headers need an explicit opt-in before Arc trusts them, and discovery endpoints require authentication outside Development.