# Page Not Found

The URL `files/a8Kyl3WGRtskKGyLoFUy` does not exist. This page may have been moved, renamed, or deleted.

## Suggested Pages

You may be looking for one of the following:
- [Unit 8: Request Body](https://fastapi-docs.duonghuuphuc.com/unit-8-request-body.md)
- [Unit 13: Data Types](https://fastapi-docs.duonghuuphuc.com/unit-13-data-types.md)
- [Unit 12: Request Body - List Fields and Nested Models](https://fastapi-docs.duonghuuphuc.com/unit-12-request-body-list-fields-and-nested-models.md)
- [Unit 16: Response Model - Return Type](https://fastapi-docs.duonghuuphuc.com/unit-16-response-model-return-type.md)
- [Unit 9: Query Parameters and Validations](https://fastapi-docs.duonghuuphuc.com/unit-9-query-parameters-and-validations.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://fastapi-docs.duonghuuphuc.com/unit-8-request-body.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://fastapi-docs.duonghuuphuc.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://fastapi-docs.duonghuuphuc.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., `/unit-8-request-body.md`).

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