> 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/the-protocol.md).

# 协议特点

本章从高层次出发概述QUIC协议。

下图是使用HTTP传输时，HTTP/2（左）和HTTP/3（右）的协议栈对比。

![QUIC logo](/files/-LvW35eBvHx2Ix3BXNhl)