How do I get followers list using user_id


#1

When I call “https://api.twitter.com/1.1/followers/ids.json?user_id=1521834458” I get that message “request”: “/1.1/followers/ids.json?user_id=1521834458”,
“error”: “Not authorized”.
But when I use “screen_name” ,it is working. I have to use user_id. I think this is twitter’s bug.