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Solution to an IE gotcha when developing Facebook App in an IFRAME

This was a very frustrating problem for us in our app Jobs (http://apps.facebook.com/getthejob).

The problem was that in IE, if a parent frame has a different domain than the child page, the session data (stored in the Session object) is not preserved as a security precaution.

Anyway, if you have this problem, the answer is available on Microsoft's website.

Simply put, in your ASP.NET page codebehind, add the following code:

protected override void OnPreRender(EventArgs e)
{
Response.AppendHeader("P3P", "CP=\"CAO PSA OUR\"");
base.OnPreRender(e);
}

This will add the right headers to every page.

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