How to download .xls file using angularjs sent using readAllBytes

Question

How to download .xls file using angularjs sent using readAllBytes

In my backend application, I have a spray route that pops the .xls file with

FileUtils.readAllBytes(xlsFile)

In my frontend application, I use angularjs with the Restangular module, so I need to get my .xls file and upload it to the user's computer.

In my code

Restangular.one("localhost:9090/excel")
        .get()
        .then(function(response){
            alert("Excel is here!");
            var hiddenElement = document.createElement('a');
            hiddenElement.href = 'data:attachment/xls,' + encodeURIComponent(response);
            hiddenElement.download = 'reporte-anual.xls';
            hiddenElement.click();
        });