Issue with AngularJS 1.4 and transformRequest and uploading to S3

I have an issue today when I updated my project from Angular 1.3 to 1.4, and it’s probably because now you can’t modify the request header with transformRequest anymore (or at least according to this article). Essentially before I was calling the upload function with these parameters:

        url: my-bucket-url,
        headers: {'Content-Type': file.type},
        method: 'POST',
        transformRequest: function (data, headersGetter) {
          // Headers change here
          var headers = headersGetter();
          delete headers.Authorization;
          return data;
        },
        fields: fieldsData,
        ...

As I had to remove the Authorization token from the header I had to transform my headers before sending the file to S3. But now I see that the Authorization is not getting removed from the headers. Any idea how to fix it? Did anybody test ng-file-upload with Angular 1.4?

[nukulb]

@danialfarid I suggest closing this.

[Deklin]

We are having an issue with angular transform request and ADDING a header. This is a deprecation since angular 1.2.x which we upgraded from.