Finally found a topic with good explanation an answers: https://www.google.com/url?q=https://community.nodebb.org/topic/12642/facebook-sso-essentials&sa=D&source=hangouts&ust=1557895821731000&usg=AFQjCNEC-61NC_THgGEdYaXQ1lTAGEh3pw Didn't expect the config.json would influence such requests. Kind regards.