oauth2_scheme = OAuth2PasswordBearer(tokenUrl="/token", auto_error=False)


@app.get("/items/")
async def read_items(token: str | None = Security(oauth2_scheme)):
    if token is None:
        return {"msg": "Create an account first"}
    return {"token": token}


client = TestClient(app)


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

    responses={404: {"description": "Not found"}},
)


fake_items_db = {"plumbus": {"name": "Plumbus"}, "gun": {"name": "Portal Gun"}}


@router.get("/")
async def read_items():
    return fake_items_db


@router.get("/{item_id}")
async def read_item(item_id: str):
    if item_id not in fake_items_db:
        raise HTTPException(status_code=404, detail="Item not found")

    response_class=JsonApiResponse,
    responses={500: {"description": "Error", "model": JsonApiError}},
)
async def a():
    pass


@app.get("/b", responses={204: {"description": "No Content"}})
async def b():
    pass  # pragma: no cover


client = TestClient(app)


def test_get_response():
    response = client.get("/a")
    assert response.status_code == 204, response.text

```Python hl_lines="1"
async def get_burgers(number: int):
    # Mache hier etwas Asynchrones, um die Burger zu erstellen
    return burgers
```

... statt mit `def`:

```Python hl_lines="2"
# Dies ist nicht asynchron
def get_sequential_burgers(number: int):

from fastapi.websockets import WebSocket

app = FastAPI()


@app.get("/")
async def read_main():
    return {"msg": "Hello World"}


@app.websocket("/ws")
async def websocket(websocket: WebSocket):
    await websocket.accept()
    await websocket.send_json({"msg": "Hello WebSocket"})
    await websocket.close()


def test_read_main():
    client = TestClient(app)
    response = client.get("/")

## HTTPX { #httpx }

**FastAPI** uygulamanız `async def` yerine normal `def` fonksiyonları kullanıyor olsa bile, altta yatan yapı hâlâ bir `async` uygulamadır.

from typing import Annotated

from fastapi import Depends, FastAPI, Header, HTTPException


async def verify_token(x_token: Annotated[str, Header()]):
    if x_token != "fake-super-secret-token":
        raise HTTPException(status_code=400, detail="X-Token header invalid")


async def verify_key(x_key: Annotated[str, Header()]):
    if x_key != "fake-super-secret-key":
        raise HTTPException(status_code=400, detail="X-Key header invalid")

def test_swagger_ui_parameters_html_chars_are_escaped():
    html = get_swagger_ui_html(
        openapi_url="/openapi.json",
        title="Test",
        swagger_ui_parameters={"customKey": "<img src=x onerror=alert(1)>"},
    )
    body = html.body.decode()
    assert "<img src=x onerror=alert(1)>" not in body
    assert "\\u003cimg" in body


def test_normal_init_oauth_still_works():
    html = get_swagger_ui_html(

        return doGet(userProperties != null ? userProperties.get(key) : null, def);
    }

    private static boolean doGet(Object val, boolean def) {
        if (val instanceof Boolean bool) {
            return bool;
        } else if (val != null) {
            return Boolean.parseBoolean(val.toString());
        } else {
            return def;
        }
    }

    name="client",
    params=[
        pytest.param("tutorial004_py310", marks=needs_py310),
    ],
)
def get_client(request: pytest.FixtureRequest):
    mod = importlib.import_module(f"docs_src.additional_responses.{request.param}")

    client = TestClient(mod.app)
    client.headers.clear()
    return client


def test_path_operation(client: TestClient):
    response = client.get("/items/foo")