}
```

Of course, you will probably find much better ways to take advantage of this than formatting JSON. 😉

## Default response class

When creating a **FastAPI** class instance or an `APIRouter` you can specify which response class to use by default.

The parameter that defines this is `default_response_class`.

```Python hl_lines="16-18  21-22  25-30  34-35  38-39  42-48"
{!../../../docs_src/sql_databases_peewee/sql_app/schemas.py!}
```

!!! tip
    Here we are creating the models with an `id`.

    We didn't explicitly specify an `id` attribute in the Peewee models, but Peewee adds one automatically.

    We are also adding the magic `owner_id` attribute to `Item`.

### Create a `PeeweeGetterDict` for the Pydantic *models* / schemas

                * `@app.get("/items/", tags=["items"])`

                The order of the tags can be used to specify the order shown in
                tools like Swagger UI, used in the automatic path `/docs`.

                It's not required to specify all the tags used.

                The tags that are not declared MAY be organized randomly or based

        match=(
            "Cannot specify `Depends` in `Annotated` and default value"
            " together for 'foo'"
        ),
    ):

        @app.get("/")
        async def get2(foo: Annotated[int, Depends(dep)] = Depends(dep)):
            pass  # pragma: nocover

    with pytest.raises(
        AssertionError,
        match=(
            "Cannot specify a FastAPI annotation in `Annotated` and `Depends` as a"

    if isinstance(value, params.Depends):
        assert depends is None, (
            "Cannot specify `Depends` in `Annotated` and default value"
            f" together for {param_name!r}"
        )
        assert field_info is None, (
            "Cannot specify a FastAPI annotation in `Annotated` and `Depends` as a"
            f" default value together for {param_name!r}"
        )

```Python hl_lines="19-24  28"
{!../../../docs_src/additional_responses/tutorial002.py!}
```

!!! note
    Notice that you have to return the image using a `FileResponse` directly.

!!! info
    Unless you specify a different media type explicitly in your `responses` parameter, FastAPI will assume the response has the same media type as the main response class (default `application/json`).

So, for everything to work correctly, it's better to specify explicitly the allowed origins.

## Use `CORSMiddleware`

You can configure it in your **FastAPI** application using the `CORSMiddleware`.

* Import `CORSMiddleware`.
* Create a list of allowed origins (as strings).
* Add it as a "middleware" to your **FastAPI** application.

You can also specify if your backend allows:

name: "Notify Translations"
description: "Notify in the issue for a translation when there's a new PR available"
author: "Sebastián Ramírez <******@****.***>"
inputs:
  token:
    description: 'Token, to read the GitHub API. Can be passed in using {{ secrets.GITHUB_TOKEN }}'
    required: true
runs:
  using: 'docker'

# Handling Errors

There are many situations in which you need to notify an error to a client that is using your API.

This client could be a browser with a frontend, a code from someone else, an IoT device, etc.

You could need to tell the client that:

* The client doesn't have enough privileges for that operation.
* The client doesn't have access to that resource.
* The item the client was trying to access doesn't exist.
* etc.

### OAuth 1

There was an OAuth 1, which is very different from OAuth2, and more complex, as it included direct specifications on how to encrypt the communication.

It is not very popular or used nowadays.

OAuth2 doesn't specify how to encrypt the communication, it expects you to have your application served with HTTPS.

!!! tip
    In the section about **deployment** you will see how to set up HTTPS for free, using Traefik and Let's Encrypt.