## Abhängigkeiten mit `yield`, `HTTPException`, `except` und Hintergrundtasks { #dependencies-with-yield-httpexception-except-and-background-tasks }

/// warning | Achtung

Sie benötigen diese technischen Details höchstwahrscheinlich nicht.

Diese Details sind hauptsächlich nützlich, wenn Sie eine FastAPI-Anwendung haben, die älter als 0.121.0 ist, und Sie auf Probleme mit Abhängigkeiten mit `yield` stoßen.

///

)
def test_required_list_str_missing(path: str, json: dict | None):
    client = TestClient(app)
    response = client.post(path, json=json)
    assert response.status_code == 422
    assert response.json() == {
        "detail": [
            {
                "type": "missing",
                "loc": IsOneOf(["body", "p"], ["body"]),
                "msg": "Field required",
                "input": IsOneOf(None, {}),
            }

    return JSONResponse(
        {"detail": exc.detail}, status_code=exc.status_code, headers=headers
    )


async def request_validation_exception_handler(
    request: Request, exc: RequestValidationError
) -> JSONResponse:
    return JSONResponse(
        status_code=422,
        content={"detail": jsonable_encoder(exc.errors())},
    )

```JSON
{
  "detail": "Item not found"
}
```

/// tip | Подсказка

При вызове `HTTPException` в качестве параметра `detail` можно передавать любое значение, которое может быть преобразовано в JSON, а не только `str`.

Вы можете передать `dict`, `list` и т.д.

                        "title": "HTTPValidationError",
                        "type": "object",
                        "properties": {
                            "detail": {
                                "title": "Detail",
                                "type": "array",
                                "items": {
                                    "$ref": "#/components/schemas/ValidationError"

     *
     * @param crudMode the CRUD operation mode
     * @param id the ID of the path mapping to display
     * @return HTML response for the path mapping details page
     */
    @Execute
    @Secured({ ROLE, ROLE + VIEW })
    public HtmlResponse details(final int crudMode, final String id) {
        verifyCrudMode(crudMode, CrudMode.DETAILS, this::asListHtml);
        saveToken();

     *
     * @param crudMode the CRUD mode for the operation
     * @param id the ID of the user to display
     * @return HTML response for the user details page
     */
    @Execute
    @Secured({ ROLE, ROLE + VIEW })
    public HtmlResponse details(final int crudMode, final String id) {
        verifyCrudMode(crudMode, CrudMode.DETAILS, this::asListHtml);
        saveToken();

     *
     * @param message the detail message explaining the cause of the exception
     */
    public InvokerException(@Nullable String message) {
        super(message);
    }

    /**
     * Constructs a new {@code InvokerException} with the specified detail message and cause.
     *
     * @param message the detail message explaining the cause of the exception

async def verify_token(x_token: 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: str = Header()):
    if x_key != "fake-super-secret-key":
        raise HTTPException(status_code=400, detail="X-Key header invalid")
    return x_key


@app.get("/items/", dependencies=[Depends(verify_token), Depends(verify_key)])

                        "title": "HTTPValidationError",
                        "type": "object",
                        "properties": {
                            "detail": {
                                "title": "Detail",
                                "type": "array",
                                "items": {
                                    "$ref": "#/components/schemas/ValidationError"