assertNotSame(
      client.routeDatabase,
      OkHttpClient.Builder()
        .build()
        .routeDatabase,
    )

    // same client with no change affecting route db
    assertSame(
      client.routeDatabase,
      client.newBuilder()
        .build()
        .routeDatabase,
    )
    assertSame(
      client.routeDatabase,
      client.newBuilder()

  }

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

          retryOnConnectionFailure = false
        }
        .build()

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

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

    assertThat(clientTestRule.recordedConnectionEventTypes()).containsExactly(

  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 connectionUser: ConnectionUser,
) : RoutePlanner {
  private var routeSelection: RouteSelector.Selection? = null
  private var routeSelector: RouteSelector? = null

          fastFallback = client.fastFallback,
          address = client.address(request.url),
          connectionUser = CallConnectionUser(this, connectionPool.connectionListener, chain),
          routeDatabase = client.routeDatabase,
        )
      this.exchangeFinder =
        when {
          client.fastFallback -> FastFallbackExchangeFinder(routePlanner, client.taskRunner)
          else -> SequentialExchangeFinder(routePlanner)

      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(

    version being used (HTTP/1.1, HTTP/2). The old name of this method was
    misleading; it was always used to configure redirects between `https://` and
    `http://` schemes.

 *  **RouteDatabase is no longer public API.** OkHttp continues to track which
    routes have failed but this is no exposed in the API.

 *  **ResponseSource is gone.** This enum exposed whether a response came from