I can get user's public info using www.instagram.com/username/?__a=1 without login and authentication, just username.
I can get user's profile detail, user time line detail if user account privacy is public.
is this is allowed? will it be deprecated in future?
Scraping violates FB's terms
thanks for your information. Now I use https://api.instagram.com/v1/users/self/media/recent/?access_token=ACCESS-TOKEN and my app was approved.
How to access public profile feed ?
How to access public profile