Oauth2 Instagram API “redirect URI does not match registered redirect URI”

Question

I am working on a Rails application which is in development mode and it can register with omniauth.

The host is

http://localhost:3000/

Answer 1

...Or you can follow the instructions here:

https://instagram.com/developer/authentication/?hl=en

See "Step One: Direct your user to our authorization URL" section.

Just simply supply your CLIENT_ID and REDIRECT_URI.

https://api.instagram.com/oauth/authorize/?client_id=CLIENT-ID&redirect_uri=REDIRECT-URI&response_type=code