403 Forbidden when downloading images on Android

Question

403 Forbidden when downloading images on Android

I'm having problems downloading images on Android from one specific server. I tried UniversalImageLoader, Picasso and most recently Volley (also with the usual HurlStack running on OkHttp). I get a 403 response code. In browsers (Chrome, Firefox, even on Android) or through wget and curl it loads normally - no problem. I tried changing the user agent of my connection, but the answer always has 403. This is my current code

MyImageRequest imgRequest = new MyImageRequest(mImgUrl, new Response.Listener<Bitmap>() {
        @Override
        public void onResponse(Bitmap response) {
            image.setImageBitmap(response);
        }
    }, 0, 0, Bitmap.Config.ARGB_8888, new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {
            Log.d(TAG, error.networkResponse.statusCode + "");
        }
    });
    imgRequest.setRetryPolicy(new DefaultRetryPolicy(
        5000,
        10,
        DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
    try {
        imgRequest.getHeaders().put("User-Agent", "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_1) AppleWebKit/537.73.11 (KHTML, like Gecko) Version/7.0.1 Safari/537.73.11");
    } catch (AuthFailureError authFailureError) {
        authFailureError.printStackTrace();
    }
    ProjectApp.getRequestQueue().add(imgRequest);