> 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/zh-tw/the-protocol.md).

# 協定的功能

本章節將從高層次出發概述 QUIC 協定。

下圖顯示了用作 HTTP 傳輸時，左側的 HTTP/2 網路堆疊和右側的 QUIC 網路堆疊的對比。

![HTTP/3 over QUIC stack overview](https://3391341413-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LvW30M9uwlSh6noqzxa%2F-LvW31Pn1JTBepfnVcl_%2F-LvW35eBvHx2Ix3BXNhl%2Fquic-stack.png?generation=1575733990196901\&alt=media)