this.connection?.incrementSuccessCount()
    }

    if (callDone) {
      return callDone(e)
    }

    return e
  }

  internal fun noMoreExchanges(e: IOException?): IOException? {
    var callDone = false
    withLock {
      if (expectMoreExchanges) {
        expectMoreExchanges = false
        callDone = !requestBodyOpen && !responseBodyOpen
      }
    }