Is there a policy per browser or is it an automatically the client receives notice from server?
closed as not a real question by Xavierjazz, Diogo, Indrek, 8088, Nifle Aug 28 '12 at 6:27
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A cookie changes as often as the server changes it and the browser accepts it. While the browser sends the cookies for each request, the server may send or withhold setting a cookie with the response as it desires.