HTTP/3 Support

[ahopkins]

This PR is meant to primarily add HTTP/3 support using the QUIC protocol over UDP. This implementation will use aioquic to create the server.

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Getting started

Currently, the best way to start in HTTP/3 mode is as follows:

$ sanic server:app --http=3 --dev

Starting in DEBUG mode will autogenerate a localhost TLS using mkcert or trustme. You will need to have a HTTP/3 capable client.

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This only introduces support for HTTP requests, an we will release the feature as still "experimental". HTTP/3 support for websockets and webtransport is not yet included. That will probably come later this Summer.

[Tronic]

A few issues.... aioquic missing from deps, ugly tracebacks when mkcert is not installed and then

KeyError: '_run_request_middleware'

Uninstall and reinstall, or maybe just restart fixed the KeyError. Likely some other version of Sanic messing it up. I'll report more soon.

[Tronic]

Seems to be working with curl3, although only serving HTTP/3 prevents browsers from connecting it. I gather this is supposed to multi-serve HTTP1 as well?

[ahopkins]

Yeah of course, there is another PR where I am working out how that api should look.

[ahopkins]

A few issues.... aioquic missing from deps, ugly tracebacks when mkcert is not installed and then

OH there are a lot more than a few issues 😆 Enough that's it probably not even worth calling out bugs yet because it's no where near an acceptable working version. At this stage it's still a question of architecture and structure.

[ahopkins]

Still adding some more tests to get better coverage, but the core of the PR is operational and is ready for some 👀.