> 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/en/the-protocol.md).

# Protocol features

The QUIC protocol from a high level.

Illustrated below is the HTTP/2 network stack on the left and the QUIC network stack on the right, when used as HTTP transport.

![HTTP/3 over QUIC stack overview](/files/-LvW35eBvHx2Ix3BXNhl)