Artur,

[cc'ing Amaury]

Am 2021-06-07 16:46, schrieb Artur:
However the only difference is the 443 port explicitly specified in the
later request.
I am not sure it's something specific to 2.4.0, but I've never seen it
before.
Is it an expected behaviour ? If so, how can I change my acls to correct
it ?

I encountered the same issue (incidentally also with socket.io). It's happening for WebSockets via HTTP/2. These are newly supported starting with HAProxy 2.4. The "broken" requests are most likely Firefox, while the working ones are not Firefox. I already have a private email thread with a few developers regarding this behavior.

Best regards
Tim Düsterhus

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