Ah. That makes sense. Thanks for the clarification.

We actually use standard protocols for the Argo Tunnel connection and we'd look at HTTP/3 as a possible mechanism for it. I agree that if there's a persistent connection the benefits of QUIC (and HTTP/2) are lessened compared to a browser doing a drive by on a web site. This is one reason the OP above is wrong about Cloudflare, HTTP/2 and Railgun.