Retrieve a Facebook Page url without a session_key

[Mathieu Fosse]

Someone knows how to retrieve the "page_url" of an "unpublished" Page
with a call to API without session_key ?

I tried :

>> Facebook.Session.create.pages :fields => ["page_url"], :page_ids => "12345"
=> []

>> Facebook.Session.create.fql_query "SELECT page_url FROM page WHERE page_id=12345"
=> []

I never retrieve the page_url of my page (page_id="12345" and
status=unpublished).
These methods return page_url only when a page is published and
unfortunately some pages that i want might be unpublished.

Of course it works with a session key but i don't want to force the
user to install my application.

Can you help me ?

Thanks in advance.