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HTTPX2 isn't about the protocol version, it's the name of a python library to make http requests.

But yes, it doesn't support HTTP3. Here's the related issue: https://github.com/pydantic/httpx2/issues/92

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because its over QUIC, which is different enough to be a pain.

Not that there is anything wrong with QUIC, at least its built by someone who knows what they are doing, unlike HTTP2

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that's not really much of an argument, almost all reasonable libraries wrap the functionality.and if a provider doesn't want to support http3 then the library will fallback, and then the laggards should pay the slow tax.
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No as in the infra between you and the end user is less developed.

Nobody is going to get fired for using http1.1

if you move to http3 and a bunch of clients cant use your site, then you're gonna get yelled at.

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Why would you assume that we have to move from techX to techX+1? If I release http4 would you assume that you have to migrate to http4 at some point?
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