Quoting "Eric Covener" <cove...@gmail.com>:
Does your response contain a Vary header?
Hi Eric, thanks for the quick response. Yes, it contains: Vary: User-Agent FYI: Date: Wed, 26 Aug 2009 11:57:35 GMT Server: Apache Expires: access plus 1 day Content-Encoding: gzip Cache-Control: max-age=86400, public Vary: User-Agent Age: 72 Content-Length: 3346 Keep-Alive: timeout=15, max=98 Connection: Keep-Alive Content-Type: text/html; charset=UTF-8
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