/// note | Détails techniques

Si vous avez des dépendances avec `yield`, le code de sortie s’exécutera après le middleware.

S’il y avait des tâches d’arrière-plan (présentées dans la section [Tâches d’arrière-plan](background-tasks.md), que vous verrez plus tard), elles s’exécuteront après tous les middlewares.

///

## Créer un middleware { #create-a-middleware }

/// note | Technische Details

Wenn Sie Abhängigkeiten mit `yield` haben, wird der Exit-Code *nach* der Middleware ausgeführt.

Wenn es Hintergrundtasks gab (dies wird später im [Hintergrundtasks](background-tasks.md)-Abschnitt behandelt), werden sie *nach* allen Middlewares ausgeführt.

///

## Eine Middleware erstellen { #create-a-middleware }

	buf, err := args.MarshalMsg(nil)
	if err != nil {
		return false, err
	}
	body := bytes.NewReader(buf)
	respBody, err := restClient.rest.Call(context.Background(), method,
		url.Values{}, body, body.Size())
	defer xhttp.DrainBody(respBody)

	switch toLockError(err) {
	case nil:
		return true, nil
	case errLockConflict, errLockNotFound:
		return false, nil

)

const contextAuditKey = contextKeyType("audit-entry")

// SetAuditEntry sets Audit info in the context.
func SetAuditEntry(ctx context.Context, audit *audit.Entry) context.Context {
	if ctx == nil {
		LogIf(context.Background(), "audit", fmt.Errorf("context is nil"))
		return nil
	}
	return context.WithValue(ctx, contextAuditKey, audit)
}

// GetAuditEntry returns Audit entry if set.
func GetAuditEntry(ctx context.Context) *audit.Entry {

	for _, t := range r.tags {
		tagsMap[t.Key] = t.Val
	}
}

// SetReqInfo sets ReqInfo in the context.
func SetReqInfo(ctx context.Context, req *ReqInfo) context.Context {
	if ctx == nil {
		LogIf(context.Background(), "", fmt.Errorf("context is nil"))
		return nil
	}
	return context.WithValue(ctx, contextLogKey, req)
}

// GetReqInfo returns ReqInfo if set.
func GetReqInfo(ctx context.Context) *ReqInfo {

			cfg[config.APISubSys] = map[string]config.KVS{
				"api": {
					{Key: "gzip", Value: config.EnableOff},
				},
			}

			var err error
			globalLambdaTargetList, err = lambda.FetchEnabledTargets(context.Background(), cfg, http.DefaultTransport.(*http.Transport))
			if err != nil {
				t.Fatalf("failed to load lambda targets: %v", err)
			}

	curTimePlus5Min := curTime.Add(time.Minute * 5)

	// bucketnames[0].
	// objectNames[0].
	// uploadIds [0].
	// Create bucket before initiating NewMultipartUpload.
	err := obj.MakeBucket(context.Background(), bucketName, MakeBucketOptions{})
	if err != nil {
		// Failed to create newbucket, abort.
		t.Fatalf("%s : %s", instanceType, err.Error())
	}

	// Test cases for signature-V2.
	testCasesV2 := []struct {

	outReq.ProtoMinor = 1

	f.rewriter.Rewrite(outReq)

	// Disable closeNotify when method GET for http pipelining
	if outReq.Method == http.MethodGet {
		quietReq := outReq.WithContext(context.Background())
		*outReq = *quietReq
	}
}

// headerRewriter is responsible for removing hop-by-hop headers and setting forwarding headers
type headerRewriter struct{}

			})
		}); err != nil {
			t.Fatalf("prepare statement and nested transaction coexist: %v", err)
		}
	})
}

func TestCancelTransaction(t *testing.T) {
	ctx := context.Background()
	ctx, cancelFunc := context.WithCancel(ctx)
	cancelFunc()

	user := *GetUser("cancel_transaction", Config{})
	DB.Create(&user)

	err := DB.WithContext(ctx).Transaction(func(tx *gorm.DB) error {

func Encrypt(k *kms.KMS, plaintext io.Reader, ctx kms.Context) (io.Reader, error) {
	algorithm := sio.AES_256_GCM
	if !sioutil.NativeAES() {
		algorithm = sio.ChaCha20Poly1305
	}

	key, err := k.GenerateKey(context.Background(), &kms.GenerateKeyRequest{AssociatedData: ctx})
	if err != nil {
		return nil, err
	}
	stream, err := algorithm.Stream(key.Plaintext)
	if err != nil {
		return nil, err
	}