Always return OK when read

[mostcute]

var res = client.read("syncdata.json");
   List<int> myList = await res;
   print("get cloud raw == $myList");
   var clouddata = String.fromCharCodes(myList);
   print("get cloud data == $clouddata  end");

result

I/flutter (10808): get cloud raw == [97, 97, 97, 97, 79, 75]
I/flutter (10808): get cloud data == aaaaOK  end

don't know why the result always apennd 79, 75 ("OK" in unicode)