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PHP Headers To Serve JSON

08.06.2008
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        The first two headers prevent the browser from caching the response (a problem with IE and GET requests) and the third sets the correct MIME type for JSON.

header('Cache-Control: no-cache, must-revalidate');
header('Expires: Mon, 26 Jul 1997 05:00:00 GMT');
header('Content-type: application/json');