{* ../../docs_src/background_tasks/tutorial001_py39.py hl[6:9] *}

## Add the background task { #add-the-background-task }

Inside of your *path operation function*, pass your task function to the *background tasks* object with the method `.add_task()`:

{* ../../docs_src/background_tasks/tutorial001_py39.py hl[14] *}

`.add_task()` receives as arguments:

{* ../../docs_src/background_tasks/tutorial001_py39.py hl[6:9] *}

## Adicione a tarefa em segundo plano { #add-the-background-task }

Dentro da sua *função de operação de rota*, passe sua função de tarefa para o objeto de *tarefas em segundo plano* com o método `.add_task()`:

{* ../../docs_src/background_tasks/tutorial001_py39.py hl[14] *}

O `.add_task()` recebe como argumentos:

import re
from types import ModuleType
from unittest.mock import patch

import pytest

from ...utils import needs_py310


@pytest.fixture(
    name="module",
    params=[
        pytest.param("tutorial009c_py39"),
        pytest.param("tutorial009c_py310", marks=needs_py310),
    ],
)
def get_module(request: pytest.FixtureRequest):
    mod = importlib.import_module(f"docs_src.python_types.{request.param}")
    return mod

from fastapi.testclient import TestClient

from docs_src.response_cookies.tutorial001_py39 import app

client = TestClient(app)


def test_path_operation():
    response = client.post("/cookie/")
    assert response.status_code == 200, response.text
    assert response.json() == {"message": "Come to the dark side, we have cookies"}

{* ../../docs_src/websockets/tutorial001_py39.py hl[2,6:38,41:43] *}

## Crear un `websocket` { #create-a-websocket }

En tu aplicación de **FastAPI**, crea un `websocket`:

{* ../../docs_src/websockets/tutorial001_py39.py hl[1,46:47] *}

/// note | Detalles Técnicos

También podrías usar `from starlette.websockets import WebSocket`.

from fastapi.testclient import TestClient

from docs_src.response_cookies.tutorial002_py39 import app

client = TestClient(app)


def test_path_operation():
    response = client.post("/cookie-and-object/")
    assert response.status_code == 200, response.text
    assert response.json() == {"message": "Come to the dark side, we have cookies"}

from docs_src.app_testing.tutorial001_py39 import client, test_read_main


def test_main():
    test_read_main()


def test_openapi_schema():
    response = client.get("/openapi.json")
    assert response.status_code == 200, response.text
    assert response.json() == {
        "openapi": "3.1.0",
        "info": {"title": "FastAPI", "version": "0.1.0"},
        "paths": {
            "/": {
                "get": {

from fastapi.testclient import TestClient

from docs_src.wsgi.tutorial001_py39 import app

client = TestClient(app)


def test_flask():
    response = client.get("/v1/")
    assert response.status_code == 200, response.text
    assert response.text == "Hello, World from Flask!"


def test_app():
    response = client.get("/v2")
    assert response.status_code == 200, response.text

{* ../../docs_src/websockets/tutorial001_py39.py hl[2,6:38,41:43] *}

## Создание `websocket` { #create-a-websocket }

Создайте `websocket` в своем **FastAPI** приложении:

{* ../../docs_src/websockets/tutorial001_py39.py hl[1,46:47] *}

/// note | Технические детали

Вы также можете использовать `from starlette.websockets import WebSocket`.

{* ../../docs_src/first_steps/tutorial001_py39.py hl[7] *}

Это функция на Python.

**FastAPI** будет вызывать её каждый раз, когда получает запрос к URL «`/`» с операцией `GET`.

В данном случае это асинхронная (`async`) функция.

---

Вы также можете определить её как обычную функцию вместо `async def`:

{* ../../docs_src/first_steps/tutorial003_py39.py hl[7] *}

/// note | Примечание