Open this page twice: once signed out of Cloudflare Access (a private window), once signed in (open p0-a and p0-b first and log in). Screenshot the whole page each time.
The frame below shows https://p0-a.dibiasi.network/frame. It reads SIGNED-IN CONTENT only if Access let it load inside a frame.
Waiting for a message from the frame…
1. Credentialed fetch from this page to https://p0-b.dibiasi.network/echo:
running…
2. Form POST to the same origin (opens a new tab; screenshot it too):
3. Top-level visit: open https://p0-b.dibiasi.network/echo (screenshot it).