xhr.send (with JSON Parameters) using GET and not POST

I want to use the parse.com platform. But I have some problems getting the results of a query with a "sort by". I have used the parse.js code from an example of the Appcelerator Blog. It seems that HTTPClient switches from GET to POST if a pass some parameters to xhr.send. Or did I do something wrong?

Here is the code:

Code in app.js:

client.getAllParms(
{
  success : getSportwagen,
  className : 'hersteller',
  object: {
    order: 'name' 
  }
});

Code in parse.js:

Client.prototype.getAllParms = function(args) {
  this.request({
    url:args.className,
    method:'GET',
    payload:args.object,
    success:args.success,
    error:args.error
  });
};
 
Client.prototype.request = function(args) {
 var xhr = Ti.Network.createHTTPClient(),
   that = this;
 alert(args);
 xhr.onload = function() {
   alert(this.responseData);
   var response = JSON.parse(this.responseText);
   Ti.API.debug('Parse Client: Request Successful');
   (args.success) ? args.success(response) : Ti.API.debug('Parse Client: Request Successful');
 };
 
 xhr.onerror = function() {
   var response = JSON.parse(this.responseText);
   (args.error) ? args.error(response,this) : Ti.API.error('Parse Client: Request Failed: '+args.url);
 };
 Ti.API.debug('parse url = ' + ENDPOINT+args.url);
 xhr.open(args.method,ENDPOINT+args.url);
 var authString = Base64.encode(that.applicationId+':'+that.masterKey);
 xhr.setRequestHeader('Authorization', 'Basic '+authString);
 xhr.setRequestHeader('Content-Type','application/json');
 
 if (args.method === 'PUT' || args.method === 'POST' || (args.method === 'GET' && !!args.payload)) {
   xhr.send(JSON.stringify(args.payload));
 }
 else {
   xhr.send('');
 }
};