TIL: The PROXY Protocol v2

The PROXY protocol from HAProxy is like X-Forwarded-For, but binary and also works for TCP and other protocols.

Seems to be supported by many (I did not try, just searched).

• HAProxy obviously

• NGINX

• Caddy

• AWS NLB

• Cloudflare Spectrum

I stumbled upon it while reading https://kanidm.github.io/kanidm/stable/evaluation_quickstart.html top to bottom.

TIL: Web Push with VAPID Key