When using 'PortalSSO' authentication, user name provided to interceptor is not taken inot account

NuxeoClient nuxeoClient = new NuxeoClient("http://localhost:8080/nuxeo", "Administrator", "Administrator");
nuxeoClient.setAuthenticationMethod(new PortalSSOAuthInterceptor("nuxeo5secretkey", "user1"));
CurrentUser currentUser = nuxeoClient.fetchCurrentUser();
System.out.println("current user: " + currentUser.getUsername());

NuxeoClient nuxeoClient = new NuxeoClient("http://localhost:8080/nuxeo", "Administrator", "Administrator");
nuxeoClient.setAuthenticationMethod(new PortalSSOAuthInterceptor("nuxeo5secretkey", "user1")).timeout(10);
CurrentUser currentUser = nuxeoClient.fetchCurrentUser();
System.out.println("current user: " + currentUser.getUsername());