Method ajaxViaJenkins() does not work in GenericJsPortlet without credentials anymore - just calling ajaxViaJenkins(url, callback) used to correctly call the signature

	@JavaScriptMethod
    public HttpResponse ajaxViaJenkins(String urlStr, String user, String pw) {
		return new ServerSideHttpCall(urlStr, user, pw);
    }

on java side. This does not work anymore (stabler 500), with Jenkins version 1.580.1 only ajaxViaJenkins(url, user, pw, callback) works in js.