You can declare `examples` for a Pydantic model that will be added to the generated JSON Schema.

{* ../../docs_src/schema_extra_example/tutorial001_py310.py hl[13:24] *}

That extra info will be added as-is to the output **JSON Schema** for that model, and it will be used in the API docs.

Por ejemplo, puedes agregar un media type adicional de `image/png`, declarando que tu *path operation* puede devolver un objeto JSON (con media type `application/json`) o una imagen PNG:

{* ../../docs_src/additional_responses/tutorial002_py310.py hl[17:22,26] *}

/// note | Nota

Nota que debes devolver la imagen usando un `FileResponse` directamente.

///

/// info | Información

{* ../../docs_src/additional_responses/tutorial002_py310.py hl[17:22,26] *}

/// note | Hinweis

Beachten Sie, dass Sie das Bild direkt mit einer `FileResponse` zurückgeben müssen.

///

/// info | Info

For example, you can add an additional media type of `image/png`, declaring that your *path operation* can return a JSON object (with media type `application/json`) or a PNG image:

{* ../../docs_src/additional_responses/tutorial002_py310.py hl[17:22,26] *}

/// note

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

///

/// info

Sie können `examples` („Beispiele“) für ein Pydantic-Modell deklarieren, welche dem generierten JSON-Schema hinzugefügt werden.

{* ../../docs_src/schema_extra_example/tutorial001_py310.py hl[13:24] *}

Diese zusätzlichen Informationen werden unverändert zum für dieses Modell ausgegebenen **JSON-Schema** hinzugefügt und in der API-Dokumentation verwendet.

Эта часть вполне обычна, большая часть кода вам уже знакома:

{* ../../docs_src/openapi_callbacks/tutorial001_py310.py hl[7:11,34:51] *}

/// tip | Совет

Query-параметр `callback_url` использует тип Pydantic <a href="https://docs.pydantic.dev/latest/api/networks/" class="external-link" target="_blank">Url</a>.

///

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

{* ../../docs_src/openapi_callbacks/tutorial001_py310.py hl[7:11,34:51] *}

/// 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.

///

{* ../../docs_src/custom_request_and_route/tutorial003_py310.py hl[26] *}

В этом примере *операции пути*, объявленные в `router`, будут использовать пользовательский класс `TimedRoute` и получат дополнительный HTTP-заголовок `X-Response-Time` в ответе с временем, затраченным на формирование ответа:

**FastAPI** allows you to declare additional information and validation for your parameters.

Let's take this application as example:

{* ../../docs_src/query_params_str_validations/tutorial001_py310.py hl[7] *}

The query parameter `q` is of type `str | None`, that means that it's of type `str` but could also be `None`, and indeed, the default value is `None`, so FastAPI will know it's not required.

/// note

from fastapi.testclient import TestClient

from tests.utils import needs_py310


@pytest.fixture(
    name="client",
    params=[
        pytest.param("tutorial002_py39"),
        pytest.param("tutorial002_py310", marks=needs_py310),
        pytest.param("tutorial002_an_py39"),
        pytest.param("tutorial002_an_py310", marks=needs_py310),
    ],
)
def get_client(request: pytest.FixtureRequest):