Any document retrieved by HTTP may point to a policy reference file through the use of a new response header, the P3P header. If a site is using P3P headers, it SHOULD include this on responses for all appropriate request methods, including HEAD and OPTIONS requests. The P3P header gives one or more comma-separated directives. (W3C TR http://www.w3.org/TR/P3P: The Platform for Privacy Preferences 1.0 (P3P1.0) Specification)



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