makeWebRequest for download FIT whit response 200 and data null

.....
var options = {
:method => Communications.HTTP_REQUEST_METHOD_GET,
:responseType => Communications.HTTP_RESPONSE_CONTENT_TYPE_FIT
};
Communications.makeWebRequest(url,{},options, method(:onWorkoutResponse) );

}

----------

function onWorkoutResponse(responseCode as Number, data as Null or Dictionary or String) as Void {


var download = downloads == null ? null : data.next();

.......