redirectURL: for Phonegap iOS Facebook login on Node+Passport.js

Building an iOS app with Phonegap and Passport.js I point to

http://ift.tt/1MUX9Rf...

to login. The server runs on http://www.example.com.

The ... is my question! What do I fill there?

My files are served locally, something like file:///var/...

If I redirect to window.location.href, I get JSON output.

If I redirect to http://www.example.com it works, but then I'm simply browsing the online web-app, instead of the local files (and no Cordova-plugin-support anymore)..

Please advice!