Simple direct download view using x-sendfile.

views.py

def direct_download(request):
    """
    Returns a file path via X-Sendfile that the webserver will serve as a regular file (vs a rendered page).

    Note: The webserver needs to support this header (i.e., Apache + mod_xsendfile)... Django dev server doesn't.
    """
    if request.method == 'GET':
        song_slug = request.GET.get('slug')
        if song_slug:
            song = get_object_or_404(Song, slug=song_slug)
        else:
            raise Http404
        filename = os.path.basename(song.path.name)
        response = HttpResponse(mimetype='audio/mpeg')
        response['Content-Disposition'] = 'attachment; filename={0}'.format(filename)
        response['X-Sendfile'] = smart_str(song.path.name)
        return response