HTTP/3 is on by default on new sites, but is shown as off in the dash panel

A new website has not changed any settings in the network section, but HTTP/3 is on and the panel shown as off, and it really turns off only after I double toggle it. Test with quiche-client


You can verify it on https://apc.plus

In my Firefox web browser, I do see:

alt-svc: h3=":443"; ma=86400, h3-29=":443"; ma=86400

Checking via online tool - HTTP/3 is working fine:

I’ve recently, few days ago added a new domain and I do see it’s enabled.

May I ask have you tried using a different Web browser?

Yes, I’ve tried Chrome Firefox Safari and both the old and new appearance.


Maybe it’s because I added the domain from the plesk panel

Hello,

Thank you for reporting this.

We have identified a quirk with how the dashboard toggle for HTTP/3 interacts with the backend which can sometimes cause problems like this. For now, if anyone faces a similar issue, we would recommend using the API to make these changes:
https://api.cloudflare.com/#zone-settings-change-http3-setting

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