title: Do i need to specify all callback URLs in credential page?
body: <p>What URLs I need to enter in Google API credential page?
  I created an Oauth2 credential for my Google App engine web app.
  I entered callback as <a href="https://myapp.appspot.com/oauth2callback" rel="nofollow">https://myapp.appspot.com/oauth2callback</a> and it works fine.
  Now I am developing V2 and am deploying the app to 2-dot-myapp, Oauth2 stopped working. Do you have to specify callbacks for all versions I am going to deploy?</p>