Error 501 (resource not available) when trying to push a notification in Angular.js

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Hi, I'm trying to send a notification using Angular.js 1.3

My code: 

dataFactory.sendNotification = function()
{
    var req = {
        method: 'POST',
        url: 'https://go.urbanairship.com/api/push',
        headers: {
            'Authorization': 'Basic <my_master_key>',
            'Content-Type' : 'application/json',
            'Accept' : 'application/vnd.urbanairship+json; version=3;'
        },
        data: {
            "audience": "all",
            "notification": {
                "alert": "Test"
            },
            "device_types": "all"
        }
    }

    $http(req).then(function (response){
        // some stuff ....
    });

It gives me:

XMLHttpRequest cannot load https://go.urbanairship.com/api/push. Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:63342' is therefore not allowed access. The response had HTTP status code 501.

Seems there's no clue to make a push (POST) by a Client (website) via API ?