```
1 validation error
path -> item_id
  value is not a valid integer (type=type_error.integer)
```

#### `RequestValidationError` или `ValidationError`

!!! warning "Внимание"
    Это технические детали, которые можно пропустить, если они не важны для вас сейчас.

```Python hl_lines="2  14-16"
{!../../../docs_src/handling_errors/tutorial004.py!}
```

Wenn Sie nun `/items/foo` besuchen, erhalten Sie statt des Default-JSON-Errors:

```JSON
{
    "detail": [
        {
            "loc": [
                "path",
                "item_id"
            ],
            "msg": "value is not a valid integer",
            "type": "type_error.integer"
        }
    ]
}
```

                    "title": "JsonApiError",
                    "required": ["errors"],
                    "type": "object",
                    "properties": {
                        "errors": {
                            "title": "Errors",
                            "type": "array",
                            "items": {"$ref": "#/components/schemas/Error"},
                        }
                    },
                },

        return False

    def _normalize_errors(errors: Sequence[Any]) -> List[Dict[str, Any]]:
        use_errors: List[Any] = []
        for error in errors:
            if isinstance(error, ErrorWrapper):
                new_errors = ValidationError(  # type: ignore[call-arg]
                    errors=[error], model=RequestErrorModel
                ).errors()
                use_errors.extend(new_errors)

    """
    A generic, FastAPI-specific error.
    """


class ValidationException(Exception):
    def __init__(self, errors: Sequence[Any]) -> None:
        self._errors = errors

    def errors(self) -> Sequence[Any]:
        return self._errors


class RequestValidationError(ValidationException):
    def __init__(self, errors: Sequence[Any], *, body: Any = None) -> None:

    except ValidationError as e:
        logging.error(f"Error parsing event file: {e.errors()}")
        sys.exit(0)
    use_pr: Union[PullRequest, None] = None
    for pr in repo.get_pulls():
        if pr.head.sha == event.workflow_run.head_commit.id:
            use_pr = pr
            break
    if not use_pr:
        logging.error(f"No PR found for hash: {event.workflow_run.head_commit.id}")
        sys.exit(0)

```
1 validation error
path -> item_id
  value is not a valid integer (type=type_error.integer)
```

### `RequestValidationError` vs `ValidationError`

!!! warning "Aviso"
    Você pode pular estes detalhes técnicos caso eles não sejam importantes para você neste momento.

        if is_coroutine:
            value, errors_ = field.validate(response_content, {}, loc=("response",))
        else:
            value, errors_ = await run_in_threadpool(
                field.validate, response_content, {}, loc=("response",)
            )
        if isinstance(errors_, list):
            errors.extend(errors_)
        elif errors_:
            errors.append(errors_)
        if errors:

    assert "/async_raise" in errors
    errors.clear()


def test_async_raise_server_error():
    client = TestClient(app, raise_server_exceptions=False)
    response = client.get("/async_raise")
    assert response.status_code == 500, response.text
    assert state["/async_raise"] == "asyncgen raise finalized"
    assert "/async_raise" in errors
    errors.clear()


def test_context_b():

# Exceptions - `HTTPException` and `WebSocketException`

These are the exceptions that you can raise to show errors to the client.

When you raise an exception, as would happen with normal Python, the rest of the execution is aborted. This way you can raise these exceptions from anywhere in the code to abort a request and show the error to the client.

You can use:

* `HTTPException`
* `WebSocketException`