With Facebook Canvas and Page Apps, it’s sometimes useful to know if a user has Liked a particular page. It could be an entry requirement for a competition / prize draw or simply something you want to record / check.
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Forcing Your Facebook App To Run Using HTTPS / SSL
Force your application to run a secure connection by detecting non-secure connections in JavaScript.
Facebook, JavaScript, SSLForcing Your Facebook App To Run In An iFrame
If you want to force your user to use your application within in an iFrame (either as a canvas app or as a fan page application), the only way to do so is using JavaScript. Here is some sample code you can use.
Facebook, JavaScript, Tutorial