{* ../../docs_src/handling_errors/tutorial001_py39.py hl[1] *}

### Lance o `HTTPException` no seu código { #raise-an-httpexception-in-your-code }

`HTTPException`, ao fundo, nada mais é do que a conjunção entre uma exceção comum do Python e informações adicionais relevantes para APIs.

E porque é uma exceção do Python, você não **retorna** (return) o `HTTPException`, você lança o (raise) no seu código.

            constructor.setAccessible(true);
            SmbComNtCancel cancel = constructor.newInstance(config, testMid);

            // Then
            assertNotNull(cancel);
            assertEquals(testMid, cancel.getMid());
            assertTrue(cancel.isCancel());
        }
    }

    @Nested
    @DisplayName("Method Behavior Tests")

type LockContext struct {
	ctx    context.Context
	cancel context.CancelFunc
}

// Context returns lock context
func (l LockContext) Context() context.Context {
	return l.ctx
}

// Cancel function calls cancel() function
func (l LockContext) Cancel() {
	if l.cancel != nil {
		l.cancel()
	}
}

// newNSLock - return a new name space lock map.

    }

    @Test
    @DisplayName("Test isResponseAsync returns false")
    void testIsResponseAsync() {
        // Given
        Smb2CancelRequest request = new Smb2CancelRequest(mockConfig, 1L, 0L);

        // When
        boolean isAsync = request.isResponseAsync();

        // Then
        assertFalse(isAsync, "Cancel requests should not expect async responses");

		t.Fatalf("Expected %#v, got %#v", apiEndpoints, newAPIEndpoints)
	}
}

// Test printing server common message.
func TestPrintServerCommonMessage(t *testing.T) {
	ctx, cancel := context.WithCancel(t.Context())
	defer cancel()

	obj, fsDir, err := prepareFS(ctx)
	if err != nil {
		t.Fatal(err)
	}
	defer os.RemoveAll(fsDir)
	if err = newTestConfig(globalMinioDefaultRegion, obj); err != nil {
		t.Fatal(err)

    inputFuture.cancel(true); // argument is ignored
    assertThrows(CancellationException.class, () -> resultFuture.get());
  }

  public void testFutureGetThrowsCancellationIfOutputCancelled() throws Exception {
    inputFuture.set(SLOW_OUTPUT_VALID_INPUT_DATA);
    outputFuture.cancel(true); // argument is ignored

    inputFuture.cancel(true); // argument is ignored
    assertThrows(CancellationException.class, () -> resultFuture.get());
  }

  public void testFutureGetThrowsCancellationIfOutputCancelled() throws Exception {
    inputFuture.set(SLOW_OUTPUT_VALID_INPUT_DATA);
    outputFuture.cancel(true); // argument is ignored

			}
		}
	}
}

func (dm *DRWMutex) startContinuousLockRefresh(lockLossCallback func(), id, source string, quorum int) {
	ctx, cancel := context.WithCancel(context.Background())

	dm.m.Lock()
	dm.cancelRefresh = cancel
	dm.m.Unlock()

	go func() {
		defer cancel()

		refreshTimer := time.NewTimer(dm.refreshInterval)
		defer refreshTimer.Stop()

		for {
			select {
			case <-ctx.Done():

    /**
     * Last fragment flag - indicates last fragment of a multi-fragment message
     */
    int DCERPC_LAST_FRAG = 0x02; /* Last fragment */
    /**
     * Pending cancel flag - indicates cancel was pending at sender
     */
    int DCERPC_PENDING_CANCEL = 0x04; /* Cancel was pending at sender */
    /**
     * Reserved flag for future use
     */
    int DCERPC_RESERVED_1 = 0x08;
    /**
     * Supports concurrent multiplexing flag.

    assertFailed(future, cause);
  }

  public void testCanceled() throws Exception {
    assertThat(future.cancel(false /* mayInterruptIfRunning */)).isTrue();
    assertCancelled(future, false);
  }

  public void testInterrupted() throws Exception {
    assertThat(future.cancel(true /* mayInterruptIfRunning */)).isTrue();
    assertCancelled(future, true);
  }