# 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](/files/-LvW35eBvHx2Ix3BXNhl)


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://http3-explained.haxx.se/zh-tw/the-protocol.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.