QUIC is a new networking transport protocol that combines the features of TCP, TLS, and more. HTTP/3 is the latest version of HTTP, the protocol that carries the vast majority of Web traffic. HTTP/3 only runs over QUIC. QUIC was initially developed by Google and first announced in 2013.
https://blog.chromium.org/2020/10/chrome-is-deploying-http3-and-ietf-quic.html
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