Array
(
    [_auth] => 9dc331a7b6c74f7a3bef2ba49ad59ede
    [_url] => /ajax/sys.pages.service/changeLocale/
    [_lock] => userId
    [fields] => Array
        (
            [0] => userId
        )
    [vals] => Array
        (
            [userId] => 0
        )
    [lockUrl()] => fa941d6e483c7ad4e6fb1b86ea12a43e
)
{"err": "You must use lib::lockUrl() to secure your ajax post!"}