IE, P3P, IFrame and blocked cookies (works until page host page has personal information requested)

Question

My company has a little widget that plugs into shopping carts. We are running into a problem where setting cookies in IE7 is not working. This is happening because we are

Answer 1

We ran into the problem described above, with the 304 requests (cached content). Our load balancer was setting a session cookie, but the Apache web server would not include the P3P header for requests that resulted in the 304 result code. So then the session info would get messed up.

So this is something to be aware of with Load Balancers. When they set a cookie for persistence tracking, make sure it also generates the P3P header, to make sure they are always sent in tandem.