# Page Not Found

The URL `link4.html` does not exist. This page may have been moved, renamed, or deleted.

## Suggested Pages

You may be looking for one of the following:
- [3-基本库的使用](https://python3webspider.cuiqingcai.com/3-ji-ben-ku-de-shi-yong.md)
- [2.5-代理基本原理](https://python3webspider.cuiqingcai.com/2.5-dai-li-ji-ben-yuan-li.md)
- [9-代理的使用](https://python3webspider.cuiqingcai.com/9-dai-li-de-shi-yong.md)
- [1.2-请求库的安装](https://python3webspider.cuiqingcai.com/1.2-qing-qiu-ku-de-an-zhuang.md)
- [9.1-代理的设置](https://python3webspider.cuiqingcai.com/9.1-dai-li-de-she-zhi.md)

## How to find the correct page

If the exact page cannot be found, you can still retrieve the information using the documentation query interface.

### Option 1 — Ask a question (recommended)

Perform an HTTP GET request on the documentation index with the `ask` parameter:

```
GET https://python3webspider.cuiqingcai.com/3-ji-ben-ku-de-shi-yong.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.

### Option 2 — Browse the documentation index

Full index: https://python3webspider.cuiqingcai.com/sitemap.md

Use this to discover valid page paths or navigate the documentation structure.

### Option 3 — Retrieve the full documentation corpus

Full export: https://python3webspider.cuiqingcai.com/llms-full.txt

Use this to access all content at once and perform your own parsing or retrieval. It will be more expensive.

## Tips for requesting documentation

Prefer `.md` URLs for structured content, append `.md` to URLs (e.g., `/3-ji-ben-ku-de-shi-yong.md`).

You may also use `Accept: text/markdown` header for content negotiation.