def test_redirect_slashes_enabled():
    app = FastAPI()
    router = APIRouter()

    @router.get("/hello/")
    def hello_page() -> str:
        return "Hello, World!"

    app.include_router(router)

    client = TestClient(app)

    response = client.get("/hello/", follow_redirects=False)
    assert response.status_code == 200

    response = client.get("/hello", follow_redirects=False)

from fastapi.testclient import TestClient

app = FastAPI()
router = APIRouter()


@router.route("/items/")
def read_items(request: Request):
    return JSONResponse({"hello": "world"})


app.include_router(router)

client = TestClient(app)


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

        users_router = APIRouter()

        @users_router.get("/users/")
        def read_users():
            return [{"name": "Rick"}, {"name": "Morty"}]

        internal_router.include_router(users_router)
        app.include_router(internal_router)
        ```
        """
        assert self is not router, (
            "Cannot include the same APIRouter instance into itself. "

    router = APIRouter()

    with pytest.raises(
        AssertionError,
        match="Cannot include the same APIRouter instance into itself. Did you mean to include a different router?",
    ):

@app.get("/")
async def not_timed():
    return {"message": "Not timed"}


@router.get("/timed")
async def timed():
    return {"message": "It's the time of my life"}

        )

    return StreamingResponse(iter_data())


app.include_router(
    prefix="/router-scope-function",
    router=router,
    dependencies=[Depends(raise_after_yield, scope="function")],
)

app.include_router(
    prefix="/router-scope-request",
    router=router,
    dependencies=[Depends(raise_after_yield, scope="request")],
)

/// info | Bilgi

`users.router`, `app/routers/users.py` dosyasının içindeki `APIRouter`’ı içerir.

`items.router` ise `app/routers/items.py` dosyasının içindeki `APIRouter`’ı içerir.

///

`app.include_router()` ile her bir `APIRouter`’ı ana `FastAPI` uygulamasına ekleyebiliriz.

Böylece o router içindeki tüm route’lar uygulamanın bir parçası olarak dahil edilir.

/// note | Teknik Detaylar

/// info | Примечание

`users.router` содержит `APIRouter` из файла `app/routers/users.py`.

А `items.router` содержит `APIRouter` из файла `app/routers/items.py`.

///

С помощью `app.include_router()` мы можем добавить каждый `APIRouter` в основное приложение `FastAPI`.

Он включит все маршруты этого маршрутизатора как часть приложения.

/// note | Технические детали

/// info | Info

`users.router` enthält den `APIRouter` in der Datei `app/routers/users.py`.

Und `items.router` enthält den `APIRouter` in der Datei `app/routers/items.py`.

///

Mit `app.include_router()` können wir jeden `APIRouter` zur Hauptanwendung `FastAPI` hinzufügen.

Es wird alle Routen von diesem Router als Teil von dieser inkludieren.

/// note | Technische Details

你也可以用不同的前綴，對同一個 router 多次呼叫 `.include_router()`。

例如，這對於在不同前綴下提供相同的 API 很有用，如 `/api/v1` 與 `/api/latest`。

這是進階用法，你可能不會需要，但若有需要它就在那裡。

## 在另一個 `APIRouter` 中納入一個 `APIRouter` { #include-an-apirouter-in-another }

就像你可以在 `FastAPI` 應用中納入一個 `APIRouter` 一樣，你也可以在另一個 `APIRouter` 中納入一個 `APIRouter`，用法如下：

```Python
router.include_router(other_router)
```