How to handle and return status code from RSVP?

help
1

Here is an example of using RSVP

http://emberjs.com/api/classes/RSVP.Promise.html

var RSVP = require('rsvp');

const callAsync = RSVP.denodeify(Meteor.call);

function getJSON(url) {
  return new Promise(function(resolve, reject){
    var xhr = new XMLHttpRequest();

    xhr.open('GET', url);
    xhr.onreadystatechange = handler;
    xhr.responseType = 'json';
    xhr.setRequestHeader('Accept', 'application/json');
    xhr.send();

    function handler() {
      if (this.readyState === this.DONE) {
        if (this.status === 200) {
          resolve(this.response);
        } else {
          reject(new Error('getJSON: `' + url + '` failed with status: [' + this.status + ']'));
        }
      }
    };
  });
}

getJSON('/posts.json').then(function(json) {
  // on fulfillment
}, function(reason) {
  // on rejection
});

But when I tried to put inside Meteor.methods

   Meteor.methods({ 
         async getJSON(url) {       
    });

and called it

 callAsync('getJSON', url).then(function(json) {
      // on fulfillment
        console.log('JSON status code is : ', json);

    }, function(reason) {
        console.log('JSON error code code is : ', reason);
    });

JSON status code is : { _45:0, _81:3, _65: _45: 0, _81: 0, _65: null, _54: null },
_54: null }

When I am expecting either 200 etc and able to pass back to calling function?