{!../../../docs_src/extending_openapi/tutorial001.py!}
```

### Generate the OpenAPI schema

Then, use the same utility function to generate the OpenAPI schema, inside a `custom_openapi()` function:

```Python hl_lines="2  15-21"
{!../../../docs_src/extending_openapi/tutorial001.py!}
```

### Modify the OpenAPI schema

Now you can add the ReDoc extension, adding a custom `x-logo` to the `info` "object" in the OpenAPI schema:

```Python hl_lines="2  15-20"
{!../../../docs_src/extending_openapi/tutorial001.py!}
```

### 🔀 🗄 🔗

🔜 👆 💪 🚮 📄 ↔, ❎ 🛃 `x-logo` `info` "🎚" 🗄 🔗:

```Python hl_lines="21-23"
{!../../../docs_src/extending_openapi/tutorial001.py!}
```

### 💾 🗄 🔗

👆 💪 ⚙️ 🏠 `.openapi_schema` "💾", 🏪 👆 🏗 🔗.

👈 🌌, 👆 🈸 🏆 🚫 ✔️ 🏗 🔗 🔠 🕰 👩‍💻 📂 👆 🛠️ 🩺.

```

### Das OpenAPI-Schema generieren

Verwenden Sie dann dieselbe Hilfsfunktion, um das OpenAPI-Schema innerhalb einer `custom_openapi()`-Funktion zu generieren:

```Python hl_lines="2  15-21"
{!../../../docs_src/extending_openapi/tutorial001.py!}
```

### Das OpenAPI-Schema ändern

```Python hl_lines="2  15-20"
{!../../../docs_src/extending_openapi/tutorial001.py!}
```

### 修改 OpenAPI 概图

添加 ReDoc 扩展信息，为 OpenAPI 概图里的  `info` **对象**添加自定义 `x-logo`：

```Python hl_lines="21-23"
{!../../../docs_src/extending_openapi/tutorial001.py!}
```

### 缓存 OpenAPI 概图

把 `.openapi_schema` 属性当作**缓存**，存储生成的概图。

通过这种方式，**FastAPI** 应用不必在用户每次打开 API 文档时反复生成概图。

只需生成一次，下次请求时就可以使用缓存的概图。