.routeDatabase,
    )
    assertNotSame(
      client.routeDatabase,
      client
        .newBuilder()
        .proxySelector(proxySelector)
        .build()
        .routeDatabase,
    )
    assertNotSame(
      client.routeDatabase,
      client
        .newBuilder()
        .proxy(Proxy.NO_PROXY)
        .build()
        .routeDatabase,
    )
    assertNotSame(

 * IP address, and TLS mode. Connections may also be recycled.
 */
class RouteSelector internal constructor(
  private val address: Address,
  private val routeDatabase: RouteDatabase,
  private val call: RealCall,
  private val fastFallback: Boolean,
) {
  // State for negotiating the next proxy to use.
  private var proxies = emptyList<Proxy>()
  private var nextProxyIndex: Int = 0

  }

  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 val socketReadTimeoutMillis: Int,
  private val pingIntervalMillis: Int,
  private val retryOnConnectionFailure: Boolean,
  private val fastFallback: Boolean,
  override val address: Address,
  private val routeDatabase: RouteDatabase,
  private val call: RealCall,
  request: Request,
) : RoutePlanner {
  private val doExtensiveHealthChecks = request.method != "GET"
  private var routeSelection: RouteSelector.Selection? = null

   * The default is 1024 bytes.
   */
  @get:JvmName("minWebSocketMessageToCompress")
  val minWebSocketMessageToCompress: Long = builder.minWebSocketMessageToCompress

  internal val routeDatabase: RouteDatabase = builder.routeDatabase ?: RouteDatabase()
  internal val taskRunner: TaskRunner = builder.taskRunner ?: TaskRunner.INSTANCE

  @get:JvmName("connectionPool")
  val connectionPool: ConnectionPool =

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

  override fun close() {
    taskFaker.close()
  }

          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)

        .apply {
          retryOnConnectionFailure = false
        }.build()

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

    assertThat(client.routeDatabase.failedRoutes).isEmpty()
    server1.takeRequest()
    assertThat(server1.requestCount).isEqualTo(1)
    assertThat(server2.requestCount).isEqualTo(0)

      }
    }
    return null
  }

  /** Returns the connection to use, which might be different from [connection]. */
  override fun handleSuccess(): RealConnection {
    call.client.routeDatabase.connected(route)

    val connection = this.connection!!
    connection.connectionListener.connectEnd(connection, route, call)

      val address = failedRoute.address
      address.proxySelector.connectFailed(
        address.url.toUri(),
        failedRoute.proxy.address(),
        failure,
      )
    }

    client.routeDatabase.failed(failedRoute)
  }

  /**
   * Track a failure using this connection. This may prevent both the connection and its route from
   * being used for future exchanges.
   */
  override fun trackFailure(