I'm new to all of this, php/cakephp/facebook.  I'm trying to create a
facebook app but ran into a problem with authentication that I can't
figure out.  I'm using the facebook php-sdk, after I send the user to
the facebook loginurl they come back to the page but I still can't get
the fb user.  If I set the loginurl redirect_uri to a different page
like users/home then I can get the fb user and everything works fine,
however I want them to come back to the same page.

This will not get a user:
$login_url = $this->facebook->getLoginUrl(array(
        'scope' => 'publish_stream', 'redirect_uri' => 'http://localhost/app/
users/index'));
echo "<script type='text/javascript'>top.location.href =
'$login_url';</script>";

This will:
$login_url = $this->facebook->getLoginUrl(array(
        'scope' => 'publish_stream', 'redirect_uri' => 'http://localhost/app/
users/home'));
echo "<script type='text/javascript'>top.location.href =
'$login_url';</script>";

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