Thanks in advance for helping a first-time poster. I've been banging my head on the wall all day...
I have a site that must be able to function and set cookies while running inside a frame. In IE, with default security settings, this is a problem, because a framed site's cookies are treated as third party. Now, I've read all the info on P3P, and I've created a compact privacy policy, served via HTTP header, an XML policy file, and an XML reference file. I have checked, and the header is being sent properly, and IE can read the policy file.
However, it is STILL blocking cookies from the site. I've created a stripped-down example here: http://www.hankshelper.com/privtest.php Note that cookies in the framed site are being blocked by IE (6, 7, and 8).
If anyone could check out my compact policy
Header set P3P "policyref=\"/w3c/p3p.xml\", CP=\"IDC DSP COR NID DEVi OUR BUS INT\""
and/or XML policy http://www.searchtempest.com/w3c/searchtempest.xml
and let me know wtf, I would be eternally grateful. I've stripped them down as much as possible, and I just can't see anything that IE would have a problem with. (And of course IE itself is wonderfully verbose as far as exactly WHY it's blocking cookies...) I'm happy to provide any additional information you need.
I'm not certain what part of our original compact policy was being rejected, but I was finally able to solve this problem with the help of couple other resources.
From here: http://www.marco.org/2007/04/27/p3p-sucks-how-to-get-frame-cookies-unblocked-in-ie6
This is approximately the minimum HTTP header needed, and it basically says “We’re not collecting any of your personal data”:
P3P: CP=”NID DSP ALL COR”
If you actually store some data, such as email addresses and login cookies, this (also working) policy may be more correct:
P3P: CP=”ALL ADM DEV PSAi COM OUR OTRo STP IND ONL”
The policy we ended up using was
ALL ADM DEV PSAo COM OUR OTRo IND ONL
Descriptions of all the compact policy parameters can be found here: http://www.p3pwriter.com/LRN_111.asp