Alt-svc Header Missing

[parkers]

I’ve noticed over the past week or two that Cloudflare sites have entirely stopped loading in HTTP/3 for me at all. So I decided to dig in and I noticed that there was no longer an alt-svc header in the page requests.

These are the response headers being sent on Cloudflare’s own https://cloudflare-quic.com/ website. So their own website, which is meant to have HTTP/3 enabled, doesn’t have it enabled. This happens to me on multiple devices.

Does anyone else see this on the Cloudflare network? It’s multiple domains for me that no longer include an alt-svc header.

[sdayman]

That does seem broken for me too. Have you opened a ticket? If so/when, please post the ticket # here.

To contact Cloudflare Customer Support, login & go to https://dash.cloudflare.com/?account=support and select get more help. If you receive an automatic response that does not help you, please reply and indicate you need more help.

[thedaveCA]

I don’t see the Alt-Svc header either, but my browser can still use HTTP/3 on sites where it’s cached.

[parkers]

Just made a ticket, #2015531. Glad I’m not the only one seeing this weird bizarre behavior.

[eva2000]

maybe @LucasPardue might know?

[cuoieriatoscana]

Hi i also have this issue and http3 protocol not granted… so please if have an answer instead of open 1000 tickets can you share here? thanks

[achiel]

Great question and very astute observation! We’ve had to disable HTTP/3 on a set of zones temporarily while we investigate an issue that was causing degraded performance in some cases. As soon as that issue has been resolved we will re-enable HTTP/3 on these zones.

[user994]

Hi all.http/3 quic has not been working for 3 weeks.