## HTTPX { #httpx }

Even if your **FastAPI** application uses normal `def` functions instead of `async def`, it is still an `async` application underneath.

app = FastAPI()


@app.put("/items/{item_id}")
def save_item_no_body(item_id: str):
    return {"item_id": item_id}


client = TestClient(app)


def test_put_no_body():
    response = client.put("/items/foo")
    assert response.status_code == 200, response.text
    assert response.json() == {"item_id": "foo"}


def test_put_no_body_with_body():

    params=[
        pytest.param("tutorial004_py39"),
        pytest.param("tutorial004_py310", marks=needs_py310),
    ],
)
def get_client(request: pytest.FixtureRequest):
    mod = importlib.import_module(f"docs_src.body.{request.param}")

    client = TestClient(mod.app)
    return client


def test_put_all(client: TestClient):
    response = client.put(
        "/items/123",

        pytest.param("tutorial001_py310", marks=needs_py310),
    ],
)
def get_module(request: pytest.FixtureRequest):
    module = importlib.import_module(f"docs_src.encoder.{request.param}")
    return module


@pytest.fixture(name="client")
def get_client(mod: ModuleType):
    client = TestClient(mod.app)
    return client


def test_put(client: TestClient, mod: ModuleType):
    fake_db = mod.fake_db

@app.get("/data")
def get_data(session: SessionDep) -> Any:
    data = list(session)
    return data


@app.get("/stream-simple")
def get_stream_simple(session: SessionDep) -> Any:
    def iter_data():
        yield from ["x", "y", "z"]

    return StreamingResponse(iter_data())


@app.get("/stream-session")
def get_stream_session(session: SessionDep) -> Any:
    def iter_data():
        yield from session

@app.get("/no_response_model-no_annotation-return_model")
def no_response_model_no_annotation_return_model():
    return User(name="John", surname="Doe")


@app.get("/no_response_model-no_annotation-return_dict")
def no_response_model_no_annotation_return_dict():
    return {"name": "John", "surname": "Doe"}


@app.get("/response_model-no_annotation-return_same_model", response_model=User)
def response_model_no_annotation_return_same_model():

from docs_src.handling_errors.tutorial004_py39 import app

client = TestClient(app)


def test_get_validation_error():
    response = client.get("/items/foo")
    assert response.status_code == 400, response.text
    assert "Validation errors:" in response.text
    assert "Field: ('path', 'item_id')" in response.text


def test_get_http_error():
    response = client.get("/items/3")

        app = FastAPI()

        @app.get("/items/{id}")
        def read_items(id: list):
            pass  # pragma: no cover


def test_invalid_simple_tuple():
    with pytest.raises(AssertionError):
        app = FastAPI()

        @app.get("/items/{id}")
        def read_items(id: tuple):
            pass  # pragma: no cover


def test_invalid_simple_set():
    with pytest.raises(AssertionError):

    price: float


@app.get("/product")
async def create_item(product: Product):
    return product


client = TestClient(app)


def test_get_with_body():
    body = {"name": "Foo", "description": "Some description", "price": 5.5}
    response = client.request("GET", "/product", json=body)
    assert response.json() == body


def test_openapi_schema():
    response = client.get("/openapi.json")

from fastapi.testclient import TestClient

app = FastAPI()


@app.get("/{repeated_alias}")
def get_parameters_with_repeated_aliases(
    path: str = Path(..., alias="repeated_alias"),
    query: str = Query(..., alias="repeated_alias"),
):
    return {"path": path, "query": query}


client = TestClient(app)


def test_get_parameters():
    response = client.get("/test_path", params={"repeated_alias": "test_query"})