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-- PHP Server Side Scripting
---- ob gzhandler() not setting "Vary: Accept-encoding" when uncompressed
mipapage - 10:21 am on Aug 12, 2011 (gmt 0)Thread source:: http://www.webmasterworld.com/php/4350206.htm
Have you searched ob_gzhandler Accept-encoding? I've not run into the issue you are describing but perhaps it is out there?
Sorry I cannot be of more help...
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