Comment by kawsper

They can just add an http header that browsers and browser plugins can listen for, they already add `cf-cache-status: HIT`, so they could add this too:

    cf-http-endpoint: 1

or if you want it to match their own terminology[0], it could be:

    cf-encryption-mode: off/flexible/full/full-strict/strict

[0]: https://developers.cloudflare.com/ssl/origin-configuration/s...