https://www.fastly.com/blog/quic-is-now-rfc-9000 [fastly.com]
QUIC is a new latency-reducing, reliable, and secure internet transport protocol that is slated to replace TCP, the most commonly used transport today.
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The IETF just published QUIC as RFC 9000, supported by RFC 9001, RFC 9002, and RFC 8999. That means QUIC version 1 is officially formalized, and QUIC deployments will now move away from using temporary draft versions to the newly minted version 1. (HTTP/3, the version of HTTP that runs on QUIC, is following closely behind, and should be published soon.)
https://blog.cloudflare.com/quic-version-1-is-live-on-cloudflare/ [cloudflare.com]
The killer feature of QUIC, however, is that it is deployable in reality. We are excited to announce that QUIC version 1, RFC 9000, is available to all Cloudflare customers.
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According to Cloudflare Radar, we're seeing around 12% of Internet traffic using QUIC with HTTP/3 already. We look forward to this increasing now that RFC 9000 is out and raising awareness of the stability of things.