javascript - How to download an xlsx in angular from express

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I am generating an
xlsx file based on some user input in
express. The info is submitted via a
post request and I wanted to return the content of the file via
res.download(...).

If I
do that I get "garbage" in the data field of my
ajax response.

I tried
to prompt a download using href="https://stackoverflow.com/questions/16514509/how-do-you-serve-a-file-for-download-with-angularjs-or-javascript">this
solution, but the content is still
"garbage".

This is my angular
controller:

$scope.generateSoldGoodsReport
            = function() {

 reportService.generateSoldGoodsReport({

            startDate: $scope.startDate,
 endDate: $scope.endDate
 })

            .then(function(report){
 var blob = new Blob([ report ], { type :
            'application/xlsx' });
 $scope.url = (window.URL ||
            window.webkitURL).createObjectURL( blob );
 })

            }

and here is my
service:

generateSoldGoodsReport:
            function (dates) {
 var deferred = $q.defer()


            $http.post('/api/secure/generateSoldGoodsReport', dates)

            .then(function(response){

            deferred.resolve(response.data)

 })
 return
            deferred.promise
 }

and
here is my server side
code:

sendFileResponse = function
            (res) {
 return function (err, fileDetails) {

 if
            (err)
 {
 res.json({
 error: 1,
 message:
            err.message,
 detailed: err.errors
 })
 }

            else
 {

 res.download(fileDetails.path + '/' +
            fileDetails.fileName)
 }
 }

            }

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class="normal">Answer

In the end
I ended up using a solution where in a post request I generated
the report and when the response was sent to the client I made a
get request to a predefined place where the generated report
was stored. I don't like this solution because I use two requests instead of
one.