**FastAPI** faz uso dele para que você veja o erro no seu log, caso você utilize um modelo de Pydantic em `response_model`, e seus dados tenham erro.

Contudo, o cliente ou usuário não terão acesso a ele. Ao contrário, o cliente receberá um "Internal Server Error" com o HTTP status code `500`.

package s3select

// /////////////////////////////////////////////////////////////////////
//
//	Validation errors.
//
// /////////////////////////////////////////////////////////////////////
func errExpressionTooLong(err error) *s3Error {
	return &s3Error{
		code:       "ExpressionTooLong",
		message:    "The SQL expression is too long: The maximum byte-length for the SQL expression is 256 KB.",

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

eine Textversion:

```
1 validation error
path -> item_id

	return errors.As(err, &bkNotFound)
}

// isErrReadQuorum check if the error type is InsufficientReadQuorum
func isErrReadQuorum(err error) bool {
	var rquorum InsufficientReadQuorum
	return errors.As(err, &rquorum)
}

// isErrWriteQuorum check if the error type is InsufficientWriteQuorum
func isErrWriteQuorum(err error) bool {
	var rquorum InsufficientWriteQuorum
	return errors.As(err, &rquorum)
}

**FastAPI** использует его для того, чтобы, если вы используете Pydantic-модель в `response_model`, и ваши данные содержат ошибку, вы увидели ошибку в журнале.

Но клиент/пользователь этого не увидит. Вместо этого клиент получит сообщение "Internal Server Error" с кодом состояния HTTP `500`.

```

以下のようなテキスト版を取得します:

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

#### `RequestValidationError`と`ValidationError`

/// warning | "注意"

これらは今のあなたにとって重要でない場合は省略しても良い技術的な詳細です。

///

	return reduceQuorumErrs(ctx, errs, ignoredErrs, readQuorum, errErasureReadQuorum)
}

// reduceWriteQuorumErrs behaves like reduceErrs but only for returning
// values of maximally occurring errors validated against writeQuorum.
func reduceWriteQuorumErrs(ctx context.Context, errs []error, ignoredErrs []error, writeQuorum int) (maxErr error) {

				fallthrough
			case errVolumeNotFound.Error():
				fallthrough
			case errFileVersionNotFound.Error():
				continue
			}
		}
		return false
	}
	return len(errs) > 0
}

// isAllBucketsNotFound will return true if all the errors are either errFileNotFound
// or errFileCorrupt
// A 0 length slice will always return false.
func isAllBucketsNotFound(errs []error) bool {
	if len(errs) == 0 {

// specified by the developer. The purpose is to simulate errors
// that are hard to simulate in practice like DiskNotFound.
// Programmed errors are stored in errors field.
type naughtyDisk struct {
	// The real disk
	disk StorageAPI
	// Programmed errors: API call number => error to return
	errors map[int]error
	// The error to return when no error value is programmed
	defaultErr error

		return errFileCorrupt
	case errUnexpected.Error():
		return errUnexpected
	case errDiskFull.Error():
		return errDiskFull
	case errVolumeNotFound.Error():
		return errVolumeNotFound
	case errVolumeExists.Error():
		return errVolumeExists
	case errFileNotFound.Error():
		return errFileNotFound
	case errFileVersionNotFound.Error():
		return errFileVersionNotFound
	case errFileNameTooLong.Error():