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ASP.NET Tip: How to Implement P3P HTTP Headers

The Problem

Q: Why "make sure to implement P3P if using iframes" ?


A: If your application is inside iframe with parent belongs to another domain - cookies will not work for some very common configurations for example IE 6/7 with privacy set to medium. If cookies don't work - session won't work.


Therefore session state turns out useless for your application under Internet Explorer. See - Privacy in Internet Explorer 6.


This is relevant when domain that hosts iframe is different from parent domain. Because of the fact that this is not very common scenario - only a few familiar with the solution.


The Solution

Solution - need to implement P3P header to tell the browser that cookies for your application inside iframe are OK for user privacy.


So, ASP.NET implementation may look like the following (global.asax):


protected void Application_BeginRequest(Object sender, EventArgs e)
{
    //
    HttpContext.Current.Response.AddHeader("p3p", "CP=\"CAO PSA OUR\"");
}

BTW, Safari won't accept cross-domain cookies even with the P3P headers.


Related Posts:

Thursday, September 27, 2007 11:37 PM

Comments

# re: ASP.NET Tip: How to Implement P3P HTTP Headers
how to delete the third-party cookies, when i using p3p cookies?

1/2/2009 12:11 PM by senthil

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