How to get the top URL from a Facebook application?

Question

How can I get the top URL (Facebook\'s address) in my iframe application?

Is there a good solution on that?

Answer 1

https://www.facebook.com/pages/YOUR_PAGE_NAME/YOUR_PAGE_ID?sk=app_APP_ID&app_data=My%20custom%20data

you can pass any string data by app_data parameter