## What it does

It will go and look in the request for that `Authorization` header, check if the value is `Bearer ` plus some token, and will return the token as a `str`.

    client = TestClient(myapp)
    with pytest.raises(WebSocketDisconnect) as e:
        with client.websocket_connect("/depends-validate/"):
            pass  # pragma: no cover
    # the validation error does produce a close message
    assert e.value.code == status.WS_1008_POLICY_VIOLATION
    # and no error is leaked
    assert caught == []


def test_depend_err_middleware():
    """

=== "Python 3.10+"

    ```Python hl_lines="18-20"
    {!> ../../../docs_src/body_multiple_params/tutorial001_an_py310.py!}
    ```

=== "Python 3.9+"

    ```Python hl_lines="18-20"
    {!> ../../../docs_src/body_multiple_params/tutorial001_an_py39.py!}
    ```

=== "Python 3.8+"

    ```Python hl_lines="19-21"
    {!> ../../../docs_src/body_multiple_params/tutorial001_an.py!}
    ```

    ) | IsDict(
        # TODO: remove when deprecating Pydantic v1
        {
            "detail": [
                {
                    "loc": ["body", "grant_type"],
                    "msg": 'string does not match regex "password"',
                    "type": "value_error.str.regex",
                    "ctx": {"pattern": "password"},
                }
            ]
        }
    )

Dieser Teil ist ziemlich normal, der größte Teil des Codes ist Ihnen wahrscheinlich bereits bekannt:

```Python hl_lines="9-13  36-53"
{!../../../docs_src/openapi_callbacks/tutorial001.py!}
```

!!! tip "Tipp"
    Der Query-Parameter `callback_url` verwendet einen Pydantic-<a href="https://docs.pydantic.dev/latest/api/networks/" class="external-link" target="_blank">Url</a>-Typ.

# Erste Schritte

Die einfachste FastAPI-Datei könnte wie folgt aussehen:

```Python
{!../../../docs_src/first_steps/tutorial001.py!}
```

Kopieren Sie dies in eine Datei `main.py`.

Starten Sie den Live-Server:

<div class="termy">

```console
$ uvicorn main:app --reload

<span style="color: green;">INFO</span>:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)

An example from the official Pydantic docs:

=== "Python 3.10+"

    ```Python
    {!> ../../../docs_src/python_types/tutorial011_py310.py!}
    ```

=== "Python 3.9+"

    ```Python
    {!> ../../../docs_src/python_types/tutorial011_py39.py!}
    ```

=== "Python 3.8+"

    ```Python
    {!> ../../../docs_src/python_types/tutorial011.py!}
    ```

!!! info

```Python hl_lines="7"
{!../../../docs_src/query_params_str_validations/tutorial006.py!}
```

!!! info
    Si vous n'avez jamais vu ce `...` auparavant : c'est une des constantes natives de Python <a href="https://docs.python.org/fr/3/library/constants.html#Ellipsis" class="external-link" target="_blank">appelée "Ellipsis"</a>.

Créez ensuite des attributs de classe avec des valeurs fixes, qui seront les valeurs autorisées pour cette énumération.

```Python hl_lines="1  6-9"
{!../../../docs_src/path_params/tutorial005.py!}
```

!!! info

<img src="/img/tutorial/behind-a-proxy/image01.png">

But if we access the docs UI at the "official" URL using the proxy with port `9999`, at `/api/v1/docs`, it works correctly! 🎉

You can check it at <a href="http://127.0.0.1:9999/api/v1/docs" class="external-link" target="_blank">http://127.0.0.1:9999/api/v1/docs</a>: