HTTP/3 support #38478

As far as I can tell, there's currently no open issue explicitly tracking for QUIC or HTTP/3. Selfishly I'm very interested in knowing when this is available, so I'd personally find it very valuable to have an issue (this issue) tracking the current state and progress.

To document the current state:

• QUIC was tracked in QUIC support #23064
• That was closed when the experimental implementation was started
• That entire implementation was later removed due to lack of support in OpenSSL
• We've now moved to the Quictls fork of OpenSSL to avoid being blocked by OpenSSL's approach to implementing QUIC
• There's a draft QUIC implementation being worked on here.
• That QUIC implementation is a prerequisite for any HTTP/3 implementation (so we're still a way off)

@jasnell I think you've been doing most of the legwork here (thank you!), is that about right?

Feel free to close this if it's a problem to create feature requests like this, but I suspect there's likely to be lots of people interested in QUIC & HTTP/3, so a central issue documenting it is pretty useful imo.