{* ../../docs_src/advanced_middleware/tutorial001_py39.py hl[2,6] *}

## `TrustedHostMiddleware` { #trustedhostmiddleware }

Impone que todas las requests entrantes tengan correctamente configurado el header `Host`, para proteger contra ataques de HTTP Host Header.

{* ../../docs_src/advanced_middleware/tutorial002_py39.py hl[2,6:8] *}

Se soportan los siguientes argumentos:

import importlib

import pytest
from fastapi.testclient import TestClient

from ...utils import needs_py310


@pytest.fixture(
    name="client",
    params=[
        pytest.param("tutorial003_py39"),
        pytest.param("tutorial003_py310", marks=needs_py310),
        pytest.param("tutorial003_an_py39"),
        pytest.param("tutorial003_an_py310", marks=needs_py310),
    ],
)
def get_client(request: pytest.FixtureRequest):

{* ../../docs_src/path_operation_advanced_configuration/tutorial003_py39.py hl[6] *}

## Fortgeschrittene Beschreibung mittels Docstring { #advanced-description-from-docstring }

import importlib

import pytest
from fastapi.testclient import TestClient

from ...utils import needs_py310


@pytest.fixture(
    name="client",
    params=[
        pytest.param("tutorial003_py39"),
        pytest.param("tutorial003_py310", marks=needs_py310),
        pytest.param("tutorial003_an_py39"),
        pytest.param("tutorial003_an_py310", marks=needs_py310),
    ],
)
def get_client(request: pytest.FixtureRequest):

@pytest.fixture(
    name="mod_name",
    params=[
        pytest.param("tutorial001_py39"),
        pytest.param("tutorial001_py310", marks=needs_py310),
        pytest.param("tutorial002_py39"),
        pytest.param("tutorial002_py310", marks=needs_py310),
        pytest.param("tutorial003_py39"),
        pytest.param("tutorial003_py310", marks=needs_py310),
    ],
)
def get_mod_name(request: pytest.FixtureRequest):

from fastapi.testclient import TestClient

from docs_src.configure_swagger_ui.tutorial003_py39 import app

client = TestClient(app)


def test_swagger_ui():
    response = client.get("/docs")
    assert response.status_code == 200, response.text
    assert '"deepLinking": false,' in response.text, (
        "overridden configs should be preserved"
    )
    assert '"deepLinking": true' not in response.text, (

And you want to handle this exception globally with FastAPI.

You could add a custom exception handler with `@app.exception_handler()`:

{* ../../docs_src/handling_errors/tutorial003_py39.py hl[5:7,13:18,24] *}

Here, if you request `/unicorns/yolo`, the *path operation* will `raise` a `UnicornException`.

But it will be handled by the `unicorn_exception_handler`.

{* ../../docs_src/path_operation_advanced_configuration/tutorial003_py39.py hl[6] *}

## Descripción avanzada desde el docstring { #advanced-description-from-docstring }

Puedes limitar las líneas usadas del docstring de una *path operation function* para OpenAPI.

{* ../../docs_src/path_operation_advanced_configuration/tutorial003_py39.py hl[6] *}

## Descrição avançada a partir de docstring { #advanced-description-from-docstring }

Você pode limitar as linhas utilizadas a partir de uma docstring de uma *função de operação de rota* para o OpenAPI.

{* ../../docs_src/python_types/tutorial003_py39.py hl[1] *}

Так как редактор кода знает типы переменных, вы получаете не только автозавершение, но и проверки ошибок:

<img src="/img/python-types/image04.png">

Теперь вы знаете, что нужно исправить — преобразовать `age` в строку с помощью `str(age)`:

{* ../../docs_src/python_types/tutorial004_py39.py hl[2] *}

## Объявление типов { #declaring-types }