XHR for WebGL file export

gistfile1.js

var data = this.canvas.toDataURL();
var request = new Request({
    url: 'http://127.0.0.1:8080',
    onFailure: function(xhr) {
        console.error(xhr);
    }
});
url = request.send('data=' + data + '&frame=' + this.frameCount);