IBM Mobile First Vietnamese characters(Special Characters) in JSON not supported in Windows Phone 8.1

Question

In my IBM mobile first application, JSON response with Vietnamese Character (Ex: Tôi là một nhân vật đặc biệt) in Windows 8.1 Phone is not working.

My char encoding is UTF-8.

resourceRequest.send($scope.dataToSendArr).then($rootScope.success, $rootScope.fail);

This stops working after this line and not calls success or neither fail, even don't go in the catch block. This works when I send JSON in English without Vietnamese character.

It works on Android and iOS with Vietnamese character.

So, how would I support Vietnamese Character or Special Character JSON response in Windows 8.1 phone ?

var resourceRequest = new WLResourceRequest("/adapters/save", WLResourceRequest.POST);
resourceRequest.setHeader("Content-Type", "application/json");
resourceRequest.setHeader('Access-Control-Allow-Origin', '*');
resourceRequest.setHeader('Access-Control-Allow-Methods', 'GET, PUT, POST, DELETE, OPTIONS');
resourceRequest.setHeader('Access-Control-Allow-Headers', 'Content-Type, Content-Range, Content-Disposition, Content-Description');

//Gets Unresponsive after this line.               
resourceRequest.send($scope.dataToSendArr).then($rootScope.success, $rootScope.fail);

Answer 1

I had a similar problem with cyrillic alphabet. The way that i deal with it was with creating of custom encoding. Please can you check my approach: Windows Phone 8 SDK WebClient Encoding Issue

Encoding name: Windows-1258