Ela é importada/incluída diretamente no FastAPI para que você possa importá-la de `fastapi` e evitar importar acidentalmente a alternativa `BackgroundTask` (sem o `s` no final) de `starlette.background`.

Usando apenas `BackgroundTasks` (e não `BackgroundTask`), é possível usá-la como um parâmetro de *função de operação de rota* e deixar o **FastAPI** cuidar do resto para você, assim como ao usar o objeto `Request` diretamente.

from fastapi import FastAPI
from fastapi.responses import UJSONResponse

app = FastAPI()


@app.get("/items/", response_class=UJSONResponse)
async def read_items():

from fastapi import FastAPI, Header

app = FastAPI()


@app.get("/items/")
async def read_items(user_agent: str | None = Header(default=None)):

# Подприложения — Mounts (монтирование) { #sub-applications-mounts }

Если вам нужны два независимых приложения FastAPI, каждое со своим собственным OpenAPI и собственными интерфейсами документации, вы можете иметь основное приложение и «смонтировать» одно (или несколько) подприложений.

## Монтирование приложения **FastAPI** { #mounting-a-fastapi-application }

`Response` 매개변수를 사용하지 않고 응답을 직접 반환하는 경우, FastAPI는 이를 직접 반환한다는 점에 유의하세요.

따라서 데이터가 올바른 유형인지 확인해야 합니다. 예: `JSONResponse`를 반환하는 경우, JSON과 호환되는지 확인하세요.

또한 `response_model`로 걸러져야 할 데이터가 전달되지 않도록 확인하세요.

///

### 추가 정보

/// note | 기술적 세부사항

`from starlette.responses import Response` 또는 `from starlette.responses import JSONResponse`를 사용할 수도 있습니다.

from fastapi import FastAPI
from fastapi.responses import RedirectResponse

app = FastAPI()


@app.get("/typer")
async def redirect_typer():

from fastapi import FastAPI

app = FastAPI()


@app.get("/users")
async def read_users():
    return ["Rick", "Morty"]


@app.get("/users")
async def read_users2():

from fastapi import FastAPI, Header

app = FastAPI()


@app.get("/items/")
async def read_items(x_token: list[str] | None = Header(default=None)):

from fastapi import FastAPI, Query

app = FastAPI()


@app.get("/items/")
async def read_items(q: list[str] | None = Query(default=None)):
    query_items = {"q": q}

# Formularmodelle { #form-models }

Sie können **Pydantic-Modelle** verwenden, um **Formularfelder** in FastAPI zu deklarieren.

/// info | Info

Um Formulare zu verwenden, installieren Sie zuerst <a href="https://github.com/Kludex/python-multipart" class="external-link" target="_blank">`python-multipart`</a>.