e: IOException?,
  ) {
    var noNewExchangesEvent = false
    lock.withLock {
      if (e is StreamResetException) {
        when {
          e.errorCode == ErrorCode.REFUSED_STREAM -> {
            // Stop using this connection on the 2nd REFUSED_STREAM error.
            refusedStreamCount++
            if (refusedStreamCount > 1) {
              noNewExchangesEvent = !noNewExchanges
              noNewExchanges = true