/** Returns a plan for the first attempt at [route]. This throws if no plan is possible. */
  @Throws(IOException::class)
  internal fun planConnectToRoute(
    route: Route,
    routes: List<Route>? = null,
  ): ConnectPlan {
    if (route.address.sslSocketFactory == null) {
      if (ConnectionSpec.CLEARTEXT !in route.address.connectionSpecs) {
        throw UnknownServiceException("CLEARTEXT communication not enabled for client")

    }
  }

  override fun protocol(): Protocol = protocol!!

  override fun toString(): String {
    return "Connection{${route.address.url.host}:${route.address.url.port}," +
      " proxy=${route.proxy}" +
      " hostAddress=${route.socketAddress}" +
      " cipherSuite=${handshake?.cipherSuite ?: "none"}" +
      " protocol=$protocol}"
  }

  companion object {

  private val retryOnConnectionFailure: Boolean,
  private val user: ConnectionUser,
  private val routePlanner: RealRoutePlanner,
  // Specifics to this plan.
  override val route: Route,
  internal val routes: List<Route>?,
  private val attempt: Int,
  private val tunnelRequest: Request?,
  internal val connectionSpecIndex: Int,
  internal val isTlsFallback: Boolean,
) : RoutePlanner.Plan, ExchangeCodec.Carrier {

  }

  private fun assertRoute(
    route: Route,
    address: Address,
    proxy: Proxy,
    socketAddress: InetAddress,
    socketPort: Int,
  ) {
    assertThat(route.address).isEqualTo(address)
    assertThat(route.proxy).isEqualTo(proxy)
    assertThat(route.socketAddress.address).isEqualTo(socketAddress)
    assertThat(route.socketAddress.port).isEqualTo(socketPort)
  }

    // we should try the next route (if there is one).
    if (e is InterruptedIOException) {
      return e is SocketTimeoutException && !requestSendStarted
    }

    // Look for known client-side or negotiation errors that are unlikely to be fixed by trying
    // again with a different route.
    if (e is SSLHandshakeException) {

   *
   * If [routes] is non-null these are the resolved routes (ie. IP addresses) for the connection.
   * This is used to coalesce related domains to the same HTTP/2 connection, such as `square.com`
   * and `square.ca`.
   */
  fun callAcquirePooledConnection(
    doExtensiveHealthChecks: Boolean,
    address: Address,
    connectionUser: ConnectionUser,
    routes: List<Route>?,

    val receivedResponseAtMillis: Long = response.receivedResponseAtMillis()
  }

  @Test @Disabled
  fun route() {
    val route: Route = factory.newRoute()
    val address: Address = route.address()
    val proxy: Proxy = route.proxy()
    val inetSocketAddress: InetSocketAddress = route.socketAddress()
  }

  @Test @Disabled
  fun tlsVersion() {
    val tlsVersion: TlsVersion = TlsVersion.TLS_1_3

    )

    // logically different scope of client for route db
    assertNotSame(
      client.routeDatabase,
      client.newBuilder()
        .dns { listOf() }
        .build()
        .routeDatabase,
    )
    assertNotSame(
      client.routeDatabase,
      client.newBuilder()
        .proxyAuthenticator { _: Route?, _: Response? -> null }
        .build()
        .routeDatabase,
    )

    responseBody = Buffer().asResponseBody(null, 0L)
  }

  @Test
  fun route() {
    val route: Route = factory.newRoute()
    val address: Address = route.address
    val proxy: Proxy = route.proxy
    val inetSocketAddress: InetSocketAddress = route.socketAddress
    val requiresTunnel: Boolean = route.requiresTunnel()
  }

  @Test
  fun socketPolicy() {

   * the proper value.
   */
  override fun writeRequestHeaders(request: Request) {
    val requestLine = RequestLine.get(request, carrier.route.proxy.type())
    writeRequest(request.headers, requestLine)
  }

  override fun reportedContentLength(response: Response): Long {
    return when {
      !response.promisesBody() -> 0L