How to set token value in headers when uploading a file angular - angularjs

Question

I am uploading a file using angular and node.js API.
I am following this link to upload a file.
In this tutorial we need to set header headers: {'Content-Type': undefined}
On other hand I need to set headers value for authentication token . For that I am setting default headers value like as $http.defaults.headers.common.Authorization = $cookieStore.get('token');
Now when I uploading a file then a error is shwoing i.e
Error: Can't set headers after they are sent.
Now please let me know how can I resolve this..
Or any solution to achieve this.
Thanks
Below is the Service and Controller for file upload
app.service('fileUpload', ['$http','$cookieStore', function ($http, $cookieStore) {
this.uploadFileToUrl = function(file, uploadUrl){
var token = $cookieStore.get('token') ;
var fd = new FormData();
fd.append('file', file);
$http.post(uploadUrl, fd, {transformRequest: angular.identity,headers: {'Content-Type': undefined} })
.success(function(res){
})
.error(function(){
});
}
}]);
app.controller('csvCtrl', function($scope, fileUpload){
$scope.importcsv=function(){
var file=$scope.myFile;
var uploadUrl="/api/parsecsv";
fileUpload.uploadFileToUrl(file, uploadUrl);
}
});

Answer 1

This should get you to the point of being able to apply the header:
app.service('fileUpload', ['$http', '$cookieStore', function ($http, $cookieStore) {
this.uploadFileToUrl = function (file, uploadUrl) {
var token = $cookieStore.get('token');
var fd = new FormData();
fd.append('file', file);
$http.post(uploadUrl, fd,
{
transformRequest: angular.identity,
headers: {
'Content-Type': undefined,
'Authorization': token
}
})
.success(function (res) {
})
.error(function () {
});
}
}]);
Once you get that working, you can set the default headers with an interceptor.