caddy http3 breaks SSE

From the community, apparently, SSE doesn't work with http3.

Aug 23 '24 06:08 WeidiDeng

/cc @dunglas since Mercure is SSE, do you happen to know how it interacts with HTTP/3?

Aug 23 '24 07:08 francislavoie

At least at protocols level, HTTP/3 works perfectly well with SSE (SSE is just a standard HTTP connection). If there is a bug, it's definitely an implementation bug.

IIRC I already tried the Mercure hub with HTTP/3 and it was working properly.

Aug 23 '24 08:08 dunglas

That's odd. I've asked for a minimal reproducer in the forum thread.

Aug 23 '24 16:08 mholt

Yes, I hit the same issue.

Sep 26 '24 01:09 jmzwcn

That's odd. I've asked for a minimal reproducer in the forum thread.

https://sse.dev/test

Oct 10 '24 15:10 otbutz

I find browser (sse client) will reconnect when it find server support a HTTP3 and having message come at the same time. The problem is just here, having reconnect, but message data is loss. This is not expected.

Oct 11 '24 02:10 jmzwcn

#> > That's odd. I've asked for a minimal reproducer in the forum thread.

https://sse.dev/test

Your test not run in HTTP3.

Oct 11 '24 02:10 jmzwcn

Your test not run in HTTP3.

I just listed a publicly available SSE endpoint as a basis for a reproducer 😉

Oct 11 '24 07:10 otbutz