* lifetime of the cache.
   *
   * <p><b>Warning:</b> this cache may not be recording statistical data. For example, a cache
   * created using {@link CacheBuilder} only does so if the {@link CacheBuilder#recordStats} method
   * was called. If statistics are not being recorded, a {@code CacheStats} instance with zero for
   * all values is returned.
   *
   */

### Crear una clase personalizada `GzipRequest` { #create-a-custom-gziprequest-class }

/// tip | Consejo

Este es un ejemplo sencillo para demostrar cómo funciona. Si necesitas soporte para Gzip, puedes usar el [`GzipMiddleware`](../advanced/middleware.md#gzipmiddleware){.internal-link target=_blank} proporcionado.

///

But it's the simplest way to focus on the server-side of WebSockets and have a working example:

{* ../../docs_src/websockets/tutorial001_py39.py hl[2,6:38,41:43] *}

## Create a `websocket` { #create-a-websocket }

In your **FastAPI** application, create a `websocket`:

{* ../../docs_src/websockets/tutorial001_py39.py hl[1,46:47] *}

/// note | Technical Details

You could also use `from starlette.websockets import WebSocket`.

    @Mock
    private TransactNamedPipeInputStream mockPipeIn;

    @InjectMocks
    private TransTransactNamedPipeResponse response;

    @BeforeEach
    void setUp() {
        // Initialize mocks created above
        MockitoAnnotations.openMocks(this);
        // We need to manually inject the mock as we are not using @InjectMocks on the constructor
        response = new TransTransactNamedPipeResponse(mockPipe);
    }

    //                                                                              Create
    //                                                                              ======
    public SMailDeliveryDepartment create() {
        return new SMailDeliveryDepartment(createPostalParkingLot(), createPostalPersonnel());
    }

                  @Override
                  @SuppressWarnings({"unchecked", "rawtypes"})
                  public Map<Class, Impl> create(Object... elements) {
                    MutableClassToInstanceMap<Impl> map = MutableClassToInstanceMap.create();
                    for (Object object : elements) {
                      Entry<Class, Impl> entry = (Entry<Class, Impl>) object;

Now you can create a new directory for the new language, running the following script:

<div class="termy">

```console
// Use the command new-lang, pass the language code as a CLI argument
$ python ./scripts/docs.py new-lang la

Successfully initialized: docs/la
```

</div>

Now you can check in your code editor the newly created directory `docs/la/`.

 * this class separates _allocations_ from _streams_. An allocation is created by a call, used for
 * one or more streams, and then released. An allocated connection won't be stolen by other calls
 * while a redirect or authorization challenge is being handled.
 *
 * When the maximum concurrent streams limit is reduced, some allocations will be rescinded.
 * Attempting to create new streams on these allocations will fail.
 *

    void testContextAccess() {
        // When
        NameServiceClientImpl client = new NameServiceClientImpl(mockContext);

        // Then
        assertNotNull(client, "Client should be created successfully");
        verify(mockContext, atLeastOnce()).getConfig();
    }

    @Test
    @DisplayName("Should handle invalid NetBIOS name quickly")

          if (isShutdown) return

          // If the stream ID is less than the last created ID, assume it's already closed.
          if (streamId <= lastGoodStreamId) return

          // If the stream ID is in the client's namespace, assume it's already closed.
          if (streamId % 2 == nextStreamId % 2) return

          // Create a stream.
          val headers = headerBlock.toHeaders()