IIRC that's never been a public API; more of an artifact for troubleshooting/support. Relying on it / parsing it directly was never recommended when I was there.

Is this documented somewhere? Are there other endpoints available by default under /cdn-cgi/? I looked around a bit but couldn't find any official documentation of this.

This is actually the fastest, always responds under 100ms! I put this in, thanks!

very groovy, thanks!