Transport and application level

The IETF QUIC protocol is a transport protocol, on top of which otherapplication protocols can be used. The initial application layer protocol isHTTP/3 (h3).

The transport layer supports connections and streams.

The legacy Google version of QUIC had transport and HTTP glued together intoone single do-it-all and was a more special-purposesend-http/2-frames-over-udp protocol.