HTTP/3 Toggle Demo

WAF 1.0 per-site HTTP/3 toggle (WS-26887) — origin demo site

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What the origin server sees

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The origin always sees a normal proxied request — the HTTP/3 toggle only affects what the edge advertises to the client, not what reaches here.

The per-site toggle sends Alt-Svc: clear instead of an h3 advert. That stops a fresh negotiation from choosing HTTP/3, but a client with a cached advert, or one that forces HTTP/3 explicitly, may still be served over HTTP/3 for a while. It's advisory, not absolute.