<p>I don't understand. Why would they get created more than once?</p>
<p>Are you saying that the client is repeating a POST operation? If so then that client is buggy as POST is, as you say, not idempotent so clients should not repeat it.</p>
<p>Adding some new header is not going to fix a broken client because a broken client that replays POST is just as likely to not implement that extra header correctly!</p>

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