It was created to generate the HTML in the backend, not to create APIs used by a modern frontend (like React, Vue.js and Angular) or by other systems (like <abbr title="Internet of Things">IoT</abbr> devices) communicating with it.

### <a href="https://www.django-rest-framework.org/" class="external-link" target="_blank">Django REST Framework</a>

By default, **FastAPI** will create a `server` in the OpenAPI schema with the URL for the `root_path`.

But you can also provide other alternative `servers`, for example if you want *the same* docs UI to interact with a staging and production environments.

⚫️ 🌅 🌟 🐍 🛠️ & 🛎 🕴. ⚫️ ⚙️ 🏗 ⚙️ 💖 👱📔.

⚫️ 📶 😆 🔗 ⏮️ 🔗 💽 (💖 ✳ ⚖️ ✳),, ✔️ ☁ 💽 (💖 🗄, ✳, 👸, ♒️) 👑 🏪 🚒 🚫 📶 ⏩.

⚫️ ✍ 🏗 🕸 👩‍💻, 🚫 ✍ 🔗 ⚙️ 🏛 🕸 (💖 😥, Vue.js &amp; 📐) ⚖️ 🎏 ⚙️ (💖 <abbr title="Internet of Things">☁</abbr> 📳) 🔗 ⏮️ ⚫️.

### <a href="https://www.django-rest-framework.org/" class="external-link" target="_blank">✳ 🎂 🛠️</a>

✳ 🎂 🛠️ ✍ 🗜 🧰 🏗 🕸 🔗 ⚙️ ✳ 🔘, 📉 🚮 🛠️ 🛠️.

## Advanced usage with `scopes`

OAuth2 has the notion of "scopes".

You can use them to add a specific set of permissions to a JWT token.

Then you can give this token to a user directly or a third party, to interact with your API with a set of restrictions.

You can learn how to use them and how they are integrated into **FastAPI** later in the **Advanced User Guide**.

## Recap

Es wurde erstellt, um den HTML-Code im Backend zu generieren, nicht um APIs zu erstellen, die von einem modernen Frontend (wie React, Vue.js und Angular) oder von anderen Systemen (wie <abbr title="Internet of Things">IoT</abbr>-Geräten) verwendet werden, um mit ihm zu kommunizieren.

### <a href="https://www.django-rest-framework.org/" class="external-link" target="_blank">Django REST Framework</a>

Es gibt viele Situationen, in denen Sie einem Client, der Ihre API benutzt, einen Fehler zurückgeben müssen.

Dieser Client könnte ein Browser mit einem Frontend, Code von jemand anderem, ein <abbr title="Internet of Things – Internet der Dinge: Geräte, die über das Internet Informationen austauschen">IoT</abbr>-Gerät, usw., sein.

Sie müssten beispielsweise einem Client sagen:

* Dass er nicht die notwendigen Berechtigungen hat, eine Aktion auszuführen.

That way, you don't have to read it all first in memory, and you can pass that generator function to the `StreamingResponse`, and return it.

This includes many libraries to interact with cloud storage, video processing, and others.

```{ .python .annotate hl_lines="2  10-12  14" }
{!../../../docs_src/custom_response/tutorial008.py!}
```

!!! tip
    Peewee also uses the term "**model**" to refer to these classes and instances that interact with the database.

    But Pydantic also uses the term "**model**" to refer to something different, the data validation, conversion, and documentation classes and instances.

![Swagger UI](https://fastapi.tiangolo.com/img/index/index-03-swagger-02.png)

* Click on the button "Try it out", it allows you to fill the parameters and directly interact with the API:

![Swagger UI interaction](https://fastapi.tiangolo.com/img/index/index-04-swagger-03.png)

And you will be able to interact with your **FastAPI** application, reading data from a real database:

<img src="/img/tutorial/sql-databases/image01.png">

## Interact with the database directly