override fun invoke() {
      var connectionErrorCode = ErrorCode.INTERNAL_ERROR
      var streamErrorCode = ErrorCode.INTERNAL_ERROR
      var errorException: IOException? = null
      try {
        reader.readConnectionPreface(this)
        while (reader.nextFrame(false, this)) {
        }
        connectionErrorCode = ErrorCode.NO_ERROR
        streamErrorCode = ErrorCode.CANCEL
      } catch (e: IOException) {