Rails - Sep 2012 - Rails 3 Facebook Authentication - Omniauth-Facebook

In this code - 
  FB.login(
    function(response) {
      if (response.authResponse) {
        return window.location =   ''/auth/facebook/callback'';
      }
    }, { scope: ''email'' }
  );

Instead of doing "window.location" here, how it can be done through
ajax?
Please help.

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