// ErrSubQueryRequired sub query required
	ErrSubQueryRequired = errors.New("sub query required")
	// ErrInvalidData unsupported data
	ErrInvalidData = errors.New("unsupported data")
	// ErrUnsupportedDriver unsupported driver
	ErrUnsupportedDriver = errors.New("unsupported driver")
	// ErrRegistered registered
	ErrRegistered = errors.New("registered")

package cmd

import (
	"errors"
)

// errInvalidArgument means that input argument is invalid.
var errInvalidArgument = errors.New("Invalid arguments specified")

// errMethodNotAllowed means that method is not allowed.
var errMethodNotAllowed = errors.New("Method not allowed")

// errSignatureMismatch means signature did not match.
var errSignatureMismatch = errors.New("Signature does not match")

// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package cmd

import "errors"

// errErasureReadQuorum - did not meet read quorum.
var errErasureReadQuorum = errors.New("Read failed. Insufficient number of drives online")

// errErasureWriteQuorum - did not meet write quorum.
var errErasureWriteQuorum = errors.New("Write failed. Insufficient number of drives online")

var errDoneForNow = errors.New("done for now")

// errSkipFile returned by the fn() for readDirFn() when it needs
// to proceed to next entry.
var errSkipFile = errors.New("skip this file")

var errIgnoreFileContrib = errors.New("ignore this file's contribution toward data-usage")

// errXLBackend XL drive mode requires fresh deployment.
var errXLBackend = errors.New("XL backend requires fresh drive")

Los códigos de estado en el rango de 400 significan que hubo un error por parte del cliente.

¿Recuerdas todos esos errores de **"404 Not Found"** (y chistes)?

## Usa `HTTPException`

Para devolver responses HTTP con errores al cliente, usa `HTTPException`.

### Importa `HTTPException`

{* ../../docs_src/handling_errors/tutorial001.py hl[1] *}

	return errors.Is(err, syscall.ENFILE) || errors.Is(err, syscall.EMFILE)
}

func osIsNotExist(err error) bool {
	return errors.Is(err, os.ErrNotExist)
}

func osIsPermission(err error) bool {
	return errors.Is(err, os.ErrPermission) || errors.Is(err, syscall.EROFS)
}

func osIsExist(err error) bool {
	return errors.Is(err, os.ErrExist)

# Handling Errors { #handling-errors }

There are many situations in which you need to notify an error to a client that is using your API.

This client could be a browser with a frontend, a code from someone else, an IoT device, etc.

You could need to tell the client that:

* The client doesn't have enough privileges for that operation.
* The client doesn't have access to that resource.
* The item the client was trying to access doesn't exist.
* etc.

				Description:    err.Error(),
				HTTPStatusCode: http.StatusBadRequest,
			}
		case errors.Is(err, kes.ErrKeyExists):
			apiErr = APIError{
				Code:           "XMinioKMSKeyExists",
				Description:    err.Error(),
				HTTPStatusCode: http.StatusConflict,
			}

		// Tier admin API errors
		case errors.Is(err, madmin.ErrTierNameEmpty):
			apiErr = APIError{
				Code:           "XMinioAdminTierNameEmpty",

			if err == io.EOF {
				if extracted {
					return nil
				}
				return errors.New("no data found on stream")
			}
			if errors.Is(err, estream.ErrNoKey) {
				fmt.Println("Skipping", stream.Name, "no private key")
				if err := stream.Skip(); err != nil {
					return fmt.Errorf("stream skip: %w", err)
				}
				continue
			}
			return fmt.Errorf("next stream: %w", err)
		}

		t.Errorf("should return record not found error, but got %v", err)
	}

	DB.Delete(&namedUser)

	var result8 NamedUser
	if err := DB.Where("name1 = @name OR name2 = @name", map[string]interface{}{"name": "jinzhu-new"}).First(&result8).Error; err == nil || !errors.Is(err, gorm.ErrRecordNotFound) {
		t.Errorf("should return record not found error, but got %v", err)