how implement library rest with authentication

Hi,
how i implement authentication with rest (REST_CONTROLLER LIBRARY) and jquery but in global way and not for each petition

jquery

PHP Code:

$config['rest_valid_logins'] = array("admin"=>"1234");$.ajaxSetup({
    xhrFields: {
        withCredentials: true
    },
    beforeSend: function (xhr) {
        xhr.setRequestHeader('Authorization', 'Basic ' + btoa('admin:1234'));
    }
}); 


rest

PHP Code:

$config['auth_source'] = 'basic';
$config['rest_valid_logins'] = array("admin"=>"1234"); 


regards