dns[server1.hostName] = listOf(ipv6, ipv4)
    socketFactory[ipv6] = server1.socketAddress
    socketFactory[ipv4] = server2.socketAddress

    client =
      client
        .newBuilder()
        .fastFallback(false)
        .apply {
          retryOnConnectionFailure = false
        }.build()

    executeSynchronously(request)
      .assertFailureMatches("stream was reset: REFUSED_STREAM")

    if (newRouteSelector == null) {
      newRouteSelector =
        RouteSelector(
          address = address,
          routeDatabase = routeDatabase,
          call = call,
          fastFallback = fastFallback,
        )
      routeSelector = newRouteSelector
    }

    // List available IP addresses for the current proxy. This may block in Dns.lookup().

  private fun newRouteSelector(
    address: Address,
    routeDatabase: RouteDatabase = this.routeDatabase,
    fastFallback: Boolean = false,
    call: RealCall = this.call,
  ): RouteSelector =
    RouteSelector(
      address = address,
      routeDatabase = routeDatabase,
      fastFallback = fastFallback,
      call = call,
    )

  companion object {
    private const val PROXY_A_PORT = 1001

      socketReadTimeoutMillis = chain.readTimeoutMillis,
      pingIntervalMillis = client.pingIntervalMillis,
      retryOnConnectionFailure = client.retryOnConnectionFailure,
      fastFallback = client.fastFallback,
      address = address,
      routeDatabase = client.routeDatabase,
      call = call,
      request = call.request(),
    )
  }

  override fun close() {
    taskFaker.close()

     * wasted resources.
     *
     * Defaults to enabled, call with [fastFallback] = false to revert to 4.x behaviour.
     *
     * [rfc_6555]: https://datatracker.ietf.org/doc/html/rfc6555
     */
    fun fastFallback(fastFallback: Boolean) =
      apply {
        this.fastFallback = fastFallback
      }

    /**

          retryOnConnectionFailure = chain.retryOnConnectionFailure,
          fastFallback = client.fastFallback,
          address = chain.address(request.url),
          routeDatabase = client.routeDatabase,
          call = this,
          request = request,
        )
      this.exchangeFinder =
        when {
          client.fastFallback -> FastFallbackExchangeFinder(routePlanner, client.taskRunner)

      HandshakeCertificates
        .Builder()
        .addTrustedCertificate(rootCa.certificate)
        .build()
    client =
      clientTestRule
        .newClientBuilder()
        .fastFallback(false) // Avoid data races.
        .dns(dns)
        .sslSocketFactory(
          handshakeCertificates.sslSocketFactory(),
          handshakeCertificates.trustManager,
        ).build()

	public final fun dispatcher ()Lokhttp3/Dispatcher;
	public final fun dns ()Lokhttp3/Dns;
	public final fun eventListenerFactory ()Lokhttp3/EventListener$Factory;
	public final fun fastFallback ()Z
	public final fun followRedirects ()Z
	public final fun followSslRedirects ()Z
	public final fun hostnameVerifier ()Ljavax/net/ssl/HostnameVerifier;
	public final fun interceptors ()Ljava/util/List;

	public final fun dispatcher ()Lokhttp3/Dispatcher;
	public final fun dns ()Lokhttp3/Dns;
	public final fun eventListenerFactory ()Lokhttp3/EventListener$Factory;
	public final fun fastFallback ()Z
	public final fun followRedirects ()Z
	public final fun followSslRedirects ()Z
	public final fun hostnameVerifier ()Ljavax/net/ssl/HostnameVerifier;
	public final fun interceptors ()Ljava/util/List;