> For the complete documentation index, see [llms.txt](https://http3-explained.haxx.se/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://http3-explained.haxx.se/ko/the-protocol/feature-trans-app.md).

# 전송 계층과 애플리케이션 계층

IETF QUIC 프로토콜은 전송 프로토콜로써 다른 애플리케이션 프로토콜이 그 위에서 사용할 수 있다. 첫 애플리케이션 계층 프로토콜은 HTTP/3(h3)다.

전송 계층은 연결과 스트림을 지원한다.

레거시 Google 버전 QUIC은 전송과 HTTP가 하나로 합쳐져 있어서 (IETF QUIC) 보다 더 특수한 목적의 send-http/2-frames-over-udp 프로토콜이었다.


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