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Presumably HTTP/3 could do WiFi-> 4G -> WiFi -> 5G -> WiFi... hand-offs as you're moving around.

Genuinely asking, is it actually working or is that like the promises of multiplexing in HTTP/2 that don't really work IRL ?

Both share the same attributes: The spec allows them to work, but they require lots of effort on the implementation side to get it right. HTTP/2 require a library which does sane write scheduling and prioritization to make it work.

QUIC handoffs are a lot more complicated. They will require a library which supports all the necessary features. And it will require infrastructure which supports it. Without infrastructure support, packets from the client might get routed to the wrong host after a IP tuple change, and can from there on not associated with the QUIC connection.

My guess is some QUIC deployments will figure out how to make it work - others likely won't, since a lot of efforts is involved.

What's wrong with HTTP/2 multiplexing?

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