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Alex Rivera
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What is the difference between Expires: 0 and Expires: -1 in the HTTP response header? RFC 2616 defines invalid date formats, especially including the value "0" as already expired . However, some servers (e.g. www.google.de ) reply with Expires: -1 . Is there an advantage over using -1 over 0 or is this even required for some broken HTTP clients?
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