[Interest] HTTP/2 on by default and "Happy Eyeballs" style connections in QNAM

[Jakub Narolewski]

Hello Mårten,

Nice, thank you! I'll have this saved somewhere. This looks exactly what 
I'm observing. I'll switch http/2 off temporarily and wait for the fix.

In the meantime, I was more-or-less able to confirm in-field that this 
is indeed the problem with AAAA records. Forcing Windows to prefer ipv4 
fixed this in one of the cases.

On 12/08/2026 11:27, Mårten Nordheim wrote:
> Hello!
>
> I have not seen this myself but for some servers I imagine it is very possibly,
> but there has been an effort to fix the issue with stalls for happy eyeballs:
> https://codereview.qt-project.org/c/qt/qtbase/+/679505
>
> Since I just recently came back from vacation I haven't had time to look at it again.
>
> As far as I remember, what is preferred depends on what is returned first in the
> DNS query, so if the AAAA listings are first then we try IPv6 first currently.
>
> Mårten:)

-- 
Best regards / Pozdrawiam serdecznie
Narolewski Jakub
Software Developer