Using facebook sdk alongside android app and web server

I am looking to implement the Facebook login SDK for my android app and will be asking permissions for user friend list. However most of my background work happens on my web server and I communicate with my app via volley. I am wondering whether I can get the friend list via the web server once the user grants permission on my app or do I have to get the friend list through my app and send it to the server. Thanks for the help