title: How to get short-lived access token?
body: <p>I saw the page about "Removal of offline_access permission" <a href="https://developers.facebook.com/roadmap/offline-access-removal/" rel="nofollow">https://developers.facebook.com/roadmap/offline-access-removal/</a> 
     but I can't find a way to let the access token expire to test my desktop app. When I log in I only can get an accesstoken with 2 month. 
      How can I make an accesstoken expire in short time? How can I get a short-lived access token?</p>