* for (Challenge challenge : response.challenges()) {
 *   // If this is preemptive auth, use a preemptive credential.
 *   if (challenge.scheme().equalsIgnoreCase("OkHttp-Preemptive")) {
 *     return response.request().newBuilder()
 *         .header("Proxy-Authorization", "secret")
 *         .build();
 *   }
 * }
 * return null; // Didn't find a preemptive auth scheme.
 * ```
 *
 * ## Reactive Authentication
 *

  fun failedCallEventSequence() {
    server!!.enqueue(
      MockResponse
        .Builder()
        .headersDelay(2, TimeUnit.SECONDS)
        .build(),
    )
    client =
      client
        .newBuilder()
        .readTimeout(Duration.ofMillis(250))
        .build()
    val call =
      client.newCall(
        Request
          .Builder()
          .url(server!!.url("/"))
          .build(),

    val request = Request(server.url("/"))
    assertConnectionNotReused(request, request)
  }

  @Test
  fun connectionsAreNotReusedIfPoolIsSizeZero() {
    client =
      client
        .newBuilder()
        .connectionPool(ConnectionPool(0, 5, TimeUnit.SECONDS))
        .build()
    server.enqueue(MockResponse(body = "a"))
    server.enqueue(MockResponse(body = "b"))
    val request = Request(server.url("/"))

    ExecutionException ee = new ExecutionException(cause);

    LoadingCache<Object, Object> cacheUnchecked =
        CacheBuilder.newBuilder().build(exceptionLoader(uee));
    LoadingCache<Object, Object> cacheChecked =
        CacheBuilder.newBuilder().build(exceptionLoader(ee));

    UncheckedExecutionException caughtUee =

      CacheBuilder<K, V> builder, CacheLoader<? super K, V> loader) {
    return new LocalLoadingCache<>(builder, loader);
  }

  private CacheBuilder<Object, Object> createCacheBuilder() {
    return CacheBuilder.newBuilder().recordStats();
  }

  // constructor tests

  public void testComputingFunction() {
    CacheLoader<Object, Object> loader =
        new CacheLoader<Object, Object>() {
          @Override

      client =
        client
          .newBuilder()
          .sslSocketFactory(
            handshakeCertificates.sslSocketFactory(),
            handshakeCertificates.trustManager,
          ).hostnameVerifier(RecordingHostnameVerifier())
          .build()
    }
    server.enqueue(MockResponse())
    client =
      client
        .newBuilder()
        .socketFactory(uselessSocketFactory)

    )
    events.clear()
    c.size()
    assertThat(events).isEmpty()
  }

  private fun assertFullyCached(response: MockResponse) {
    server.enqueue(response.newBuilder().body("A").build())
    server.enqueue(response.newBuilder().body("B").build())
    val url = server.url("/")
    assertThat(get(url).body.string()).isEqualTo("A")
    assertThat(get(url).body.string()).isEqualTo("A")
  }

  /**

    IntStream.range(0, count).parallel().forEach(consumer);
  }

  @Override
  public void setUp() throws Exception {
    super.setUp();
    this.cache =
        CacheBuilder.newBuilder()
            .expireAfterAccess(500000, MILLISECONDS)
            .maximumSize(count)
            .build();
  }

  public void testComputeIfAbsent() {
    // simultaneous insertion for same key, expect 1 winner

          handshakeCertificates.trustManager,
        ).dns(dns)
        .build()

    server.enqueue(MockResponse())

    val url =
      server
        .url("/")
        .newBuilder()
        .host("localhost.localdomain")
        .build()
    val call = client.newCall(Request(url = url))
    val response = call.execute()
    assertThat(response.isSuccessful).isTrue()

    )
    val client1 =
      client
        .newBuilder()
        .readTimeout(Duration.ofSeconds(2))
        .build()
    val call1 =
      client1
        .newCall(
          Request
            .Builder()
            .url(server.url("/"))
            .build(),
        )
    val client2 =
      client
        .newBuilder()
        .readTimeout(Duration.ofMillis(200))
        .build()