function get_xml_rest_api_response( $xml ) {
    $response = new WP_REST_Response( $xml );
    $response->set_status( 200 );
    $response->set_headers( array_merge(
        $response->get_headers(),
        array(
            'Content-Type' => 'text/xml; charset=UTF-8'
        )
    ) );
    return $response;
}