angularjs - Send multipart/form-data files with angular using $http

Question

I know there are a lot of questions about this, but I can't get this to work:

I want to upload a file from input to a server in multipart/form-data

I've tried two approaches. First:

headers: {
  'Content-Type': undefined
},

Which results in e.g. for an image

Content-Type:image/png

while it should be multipart/form-data

and the other:

headers: {
  'Content-Type': multipart/form-data
},

But this asks for a boundry header, which I believe should not be manually inserted...

What is a clean way to solve this problem? I've read that you can do

$httpProvider.defaults.headers.post['Content-Type'] = 'multipart/form-data; charset=utf-8';

But I don't want all my posts to be multipart/form-data. The default should be JSON

Answer 1

Take a look at the FormData object: https://developer.mozilla.org/en/docs/Web/API/FormData

this.uploadFileToUrl = function(file, uploadUrl){
        var fd = new FormData();
        fd.append('file', file);
        $http.post(uploadUrl, fd, {
            transformRequest: angular.identity,
            headers: {'Content-Type': undefined}
        })
        .success(function(){
        })
        .error(function(){
        });
    }