Em sua rota WebSocket você pode esperar (`await`) por mensagens e enviar mensagens.

{* ../../docs_src/websockets/tutorial001_py39.py hl[48:52] *}

Você pode receber e enviar dados binários, de texto e JSON.

## Tente { #try-it }

Se seu arquivo for nomeado `main.py`, execute sua aplicação com:

<div class="termy">

```console
$ fastapi dev main.py

    expectUnchanged();
  }

  @CollectionFeature.Require(absent = SUPPORTS_ADD)
  public void testAddAll_unsupportedNothing() {
    try {
      assertFalse(
          "addAll(nothing) should return false or throw", collection.addAll(emptyCollection()));
    } catch (UnsupportedOperationException tolerated) {
    }
    expectUnchanged();
  }

      return arbitraryConstantInstanceOrNull(type);
    }
    Constructor<T> constructor;
    try {
      constructor = type.getConstructor();
    } catch (NoSuchMethodException e) {
      return arbitraryConstantInstanceOrNull(type);
    }
    constructor.setAccessible(true); // accessibility check is too slow
    try {
      return constructor.newInstance();

	if IsDCOS() {
		universePkgVersion := env.Get("MARATHON_APP_LABEL_DCOS_PACKAGE_VERSION", "")
		// On DC/OS environment try to the get universe package version.
		if universePkgVersion != "" {
			uaAppend(" universe-", universePkgVersion)
		}
	}

	if IsKubernetes() {
		// In Kubernetes environment, try to fetch the helm package version
		helmChartVersion := getHelmVersion("/podinfo/labels")
		if helmChartVersion != "" {

    }

    public Map<String, Lifecycle> getLifecycleMappings() throws IOException, XMLStreamException {
        if (lifecycleMappings == null) {
            LifecycleConfiguration lifecycleConfiguration;

            try (InputStream input = getDescriptorStream(LIFECYCLE_DESCRIPTOR)) {
                lifecycleConfiguration = new LifecycleStaxReader().read(input);
            }

            lifecycleMappings = new HashMap<>();

      final Executor executor;

      RunnableExecutorPair(Runnable runnable, Executor executor) {
        this.runnable = runnable;
        this.executor = executor;
      }

      void execute() {
        try {
          executor.execute(runnable);
        } catch (RuntimeException e) {
          log.log(
              Level.SEVERE,
              "RuntimeException while executing runnable "
                  + runnable

    }
    throw new NoSuchMethodError(methodName);
  }

  @Override
  public void run() {
    assertSame(this, Thread.currentThread());
    try {
      while (true) {
        Request request = requestQueue.take();
        Object result;
        try {
          result = invokeMethod(request.methodName, request.arguments);
        } catch (ThreadDeath death) {
          return;

        .hostnameVerifier { hostname, session ->
          val s = "hostname: $hostname peerHost:${session.peerHost}"
          Log.d("SniOverrideTest", s)
          try {
            val cert = session.peerCertificates[0] as X509Certificate
            for (name in cert.subjectAlternativeNames) {
              if (name[0] as Int == 2) {
                Log.d("SniOverrideTest", "cert: " + name[1])

          return originalResponse.newBuilder()
              .body(new ProgressResponseBody(originalResponse.body(), progressListener))
              .build();
        })
        .build();

    try (Response response = client.newCall(request).execute()) {
      if (!response.isSuccessful()) throw new IOException("Unexpected code " + response);

      System.out.println(response.body().string());
    }
  }

/**
 * A policy for how the pool should treat a specific address.
 */
class AddressPolicy(
  /**
   * How many concurrent calls should be possible to make at any time.
   * The pool will routinely try to pre-emptively open connections to satisfy this minimum.
   * Connections will still be closed if they idle beyond the keep-alive but will be replaced.
   */
  @JvmField val minimumConcurrentCalls: Int = 0,