We are already doing this by saving the previous page users are at session[:original_uri] after clearing the session and redirecting (read carefully the order this code is executed).

1. resets current session
2. redirect to login_users_path
3. line 164, session is { :original_uri => 'whatever' }

https://github.com/theforeman/foreman/blob/develop/app/controllers/application_controller.rb#L164

and then we just redirect to it on successful login:

https://github.com/theforeman/foreman/blob/develop/app/controllers/users_controller.rb#L113

So I'm closing this unless this ticket meant something different I didn't understand.

Reopening as katello's URLs aren't properly redirected to. Our use of angular and hashtags mean that urls such as:

/katello/content_views/#/content_views
end up being redirected to:

/katello/content_views/

which is a blank page. We added support long ago in katello and had to do some javascript work to make it send up the 'actual' url to the server so it could redirect properly.