code: def process_response(self, request, response):
          
          response['P3P'] = 'CP="IDC CURa ADMa OUR IND PHY ONL COM STA"'
  
          if FANDJANGO_CACHE_SIGNED_REQUEST:
              if hasattr(request, "facebook") and request.facebook and request.facebook.signed_request:
                  response.set_cookie('signed_request', request.facebook.signed_request.generate())
              else:
                  response.delete_cookie('signed_request')
          
          return response
docs: Set compact P3P policies and save signed request to cookie.
  
          P3P is a WC3 standard (see http://www.w3.org/TR/P3P/), and although largely ignored by most
          browsers it is considered by IE before accepting third-party cookies (ie. cookies set by
          documents in iframes). If they are not set correctly, IE will not set these cookies.