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

[Hamish Moffatt]

On 12/08/2026 3:03 am, Jakub Narolewski wrote:
> 3. Is turning HTTP/2 off per request the accepted way to deal with 
> this, or is there a
>    supported way to keep HTTP/2 and still get the address-family 
> fallback? Turning it off
>    everywhere feels like a large hammer for what may be a 
> connection-phase problem, but I
>    haven't found anything better.


To be honest, I found HTTP/2 to be unusable in Qt due to QTBUG-75573. 
Perhaps you are lucky and don't hit this with your use case or servers.

I haven't re-tested it in years but it seems some other users hit this 
with recent versions just last year.


Hamish