fun configureClientDefault() {
    val request =
      Request
        .Builder()
        .url(server.url("/"))
        .build()
    val timeoutClient =
      client
        .newBuilder()
        .callTimeout(Duration.ofMillis(456))
        .build()
    val call = timeoutClient.newCall(request)
    assertThat(call.timeout().timeoutNanos())
      .isEqualTo(TimeUnit.MILLISECONDS.toNanos(456))
  }

  @Test

  }

  @Test
  fun okHttpClientBuilder() {
    var builder: OkHttpClient.Builder = OkHttpClient.Builder()
    builder = builder.callTimeout(0L, TimeUnit.SECONDS)
    builder = builder.callTimeout(Duration.ofSeconds(0L))
    builder = builder.connectTimeout(0L, TimeUnit.SECONDS)
    builder = builder.connectTimeout(Duration.ofSeconds(0L))

      )
    serverIpv4.close()
    serverIpv6.enqueue(
      MockResponse(body = "hello from IPv6"),
    )

    client =
      client
        .newBuilder()
        .fastFallback(false)
        .callTimeout(1_000, TimeUnit.MILLISECONDS)
        .build()
    val call = client.newCall(Request(url))
    assertFailsWith<IOException> {
      call.execute()
    }.also { expected ->

	public final fun build ()Lokhttp3/OkHttpClient;
	public final fun cache (Lokhttp3/Cache;)Lokhttp3/OkHttpClient$Builder;
	public final fun callTimeout (JLjava/util/concurrent/TimeUnit;)Lokhttp3/OkHttpClient$Builder;
	public final fun callTimeout (Ljava/time/Duration;)Lokhttp3/OkHttpClient$Builder;
	public final fun callTimeout-LRDsOJo (J)Lokhttp3/OkHttpClient$Builder;
	public final fun certificatePinner (Lokhttp3/CertificatePinner;)Lokhttp3/OkHttpClient$Builder;

	public final fun build ()Lokhttp3/OkHttpClient;
	public final fun cache (Lokhttp3/Cache;)Lokhttp3/OkHttpClient$Builder;
	public final fun callTimeout (JLjava/util/concurrent/TimeUnit;)Lokhttp3/OkHttpClient$Builder;
	public final fun callTimeout (Ljava/time/Duration;)Lokhttp3/OkHttpClient$Builder;
	public final fun callTimeout-LRDsOJo (J)Lokhttp3/OkHttpClient$Builder;
	public final fun certificatePinner (Lokhttp3/CertificatePinner;)Lokhttp3/OkHttpClient$Builder;

      private val client: OkHttpClient = OkHttpClient.Builder()
          .connectTimeout(5, TimeUnit.SECONDS)
          .writeTimeout(5, TimeUnit.SECONDS)
          .readTimeout(5, TimeUnit.SECONDS)
          .callTimeout(10, TimeUnit.SECONDS)
          .build()

      fun run() {
        val request = Request.Builder()
            .url("http://httpbin.org/delay/2") // This URL is served with a 2 second delay.
            .build()

    other engines on other platforms. [Ktor] does this pretty well today!

 *  Breaking: Use `kotlin.time.Duration` in APIs like `OkHttpClient.Builder.callTimeout()`. This
    update also drops support for the `DurationUnit` functions introduced in earlier alpha releases
    of OkHttp 5.

    reading the full response body. If a call requires redirects or retries all must complete within
    one timeout period.

    Use `OkHttpClient.Builder.callTimeout()` to specify the default duration and `Call.timeout()` to
    specify the timeout of an individual call.

 *  New: Return values and fields are now non-null unless otherwise annotated.