[fix] opensearch/rss content type

                              ,number_of_results=len(results)

                              ,base_url=get_base_url()

                              )

        response = Response(response_rss, mimetype='application/xml')

        response.headers.add('Content-Disposition', 'attachment;Filename=searx_-_{0}.xml'.format('_'.join(query.split())))

        return response

        return Response(response_rss, mimetype='text/xml')

    return render('results.html'