### Requisições CORS pré-voo (preflight) { #cors-preflight-requests }

Estas são quaisquer solicitações `OPTIONS` com cabeçalhos `Origin` e `Access-Control-Request-Method`.

Nesse caso, o middleware interceptará a solicitação recebida e responderá com cabeçalhos CORS apropriados e uma resposta `200` ou `400` para fins informativos.

### Requisições Simples { #simple-requests }

    server.enqueue(MockResponse(body = "DEF"))
    val client2 =
      client
        .newBuilder()
        .addNetworkInterceptor(
          object : Interceptor {
            var executedCall = false

            override fun intercept(chain: Interceptor.Chain): Response {
              if (!executedCall) {
                // At this point, we have a healthy HTTP/2 connection. This call will trigger the

      @SuppressWarnings("unchecked")
      Map<String, String> proxy =
          Reflection.newProxy(Map.class, new CheckSetUpInvocationHandler(map, setUpRan));
      return proxy;
    }
  }

  /**
   * Intercepts calls to a {@code Map} to check that {@code setUpRan} is true when they happen. Then
   * forwards the calls to the underlying {@code Map}.
   */

Lorsqu'une connexion WebSocket est fermée, l'instruction `await websocket.receive_text()` lèvera une exception `WebSocketDisconnect`, que vous pouvez ensuite intercepter et gérer comme dans cet exemple.

{* ../../docs_src/websockets_/tutorial003_py310.py hl[79:81] *}

Pour l'essayer :

* Ouvrez l'application dans plusieurs onglets du navigateur.

      @SuppressWarnings("unchecked")
      Map<String, String> proxy =
          Reflection.newProxy(Map.class, new CheckSetUpInvocationHandler(map, setUpRan));
      return proxy;
    }
  }

  /**
   * Intercepts calls to a {@code Map} to check that {@code setUpRan} is true when they happen. Then
   * forwards the calls to the underlying {@code Map}.
   */

        "Expected 'Sec-WebSocket-Accept' header value '$acceptExpected' but was '$headerAccept'",
      )
    }

    return response.socket
      ?: throw ProtocolException("Web Socket socket missing: bad interceptor?")
  }

  /**
   * This accepts a [BufferedSource] instead of using [Socket.source], just in case we've already
   * received data from the peer. This accepts a [BufferedSink] for symmetry with the source.
   */

   * as a **network interceptor**. It will strip the `Location` header of impacted responses to
   * prevent the redirect.
   *
   * ```
   * OkHttpClient client = client.newBuilder()
   *   .addNetworkInterceptor(new LegacyRedirectInterceptor())
   *   .build();
   * ```
   */
  internal class LegacyRedirectInterceptor : Interceptor {