* and duplex calls where the timeout only applies to the initial setup.
   */
  fun timeoutEarlyExit() {
    check(!timeoutEarlyExit)
    timeoutEarlyExit = true
    timeout.exit()
  }

  /**
   * @param closeExchange true if the current exchange should be closed because it will not be used.
   *     This is usually due to either an exception or a retry.
   */

      trackFailure(e)
      throw e
    }
  }

  @Throws(IOException::class)
  fun peekTrailers(): Headers? = codec.peekTrailers()

  fun upgradeToSocket(): Socket {
    call.timeoutEarlyExit()
    (codec.carrier as RealConnection).useAsSocket()

    eventListener.requestBodyStart(call)

    return object : Socket {
      override fun cancel() {
        ******@****.***()
      }

        val exchange = call.interceptorScopedExchange
        val followUp = followUpRequest(response, exchange)

        if (followUp == null) {
          if (exchange != null && exchange.isDuplex) {
            call.timeoutEarlyExit()
          }
          closeActiveExchange = false
          call.eventListener.followUpDecision(call, response, null)
          return response
        }

        val followUpBody = followUp.body