Facebook, IE and P3P

For the last few weeks 开发者_如何转开发I'm trying to locate a problem with session cookie saving in IE. Our application is running inside an iFrame, so the cookies are considered 3rd party.

I'm aware of the P3P header required by IE 6 and 7, but for some reason I still see many IE6/7 users which never save cookies. I'm also unable to reproduce it on our own machines.

I tried the following P3P header: CP=\"IDC DSP COR ADM DEVi TAIi PSA PSD IVAi IVDi CONi HIS OUR IND CNT\"

Does anyone knows the exact requirements of IE6/7 for saving 3rd party cookies? I couldn't find it anywhere.

Note: I know that this topic has been disscussed many times, and I've read almost any thread on the subject.

Thanks, Shlomi Fruchter

Use this one it is working perfect in IE and all other browsers

header('P3P: CP="IDC DSP COR CURa ADMa OUR IND PHY ONL COM STA"');

You should read http://blogs.msdn.com/b/ieinternals/archive/2010/06/05/understanding-internet-explorer-cookie-controls.aspx.