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I'm generating dynamic content with PHP. I'm sending the following HTTP-header: HTTP/1.1 304 Not Modified Date: Sun, 09 Dec 2012 17:24:41 GMT Server: Apache Connection: keep-alive, Keep-Alive Keep-Alive: timeout=1, max=100 Etag: "237f43b800e655dbe6567f7d32d34c99" Expires: Sun, 16 Dec 2012 17:24:41 GMT Cache-Control: max-age=604800 Vary: Accept-Encoding I later check for the Etag to send a header('HTTP/1.1 304 Not Modified') if it matches. This works perfectly with Chrome and Firefox. However, Safari (Version 6.0.2) does not send "If-Modified-Since" and "If-None-Match" headers. This is the Request-Header sent by Safari on the second page hit: User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_8_2) AppleWebKit/536.26.17 (KHTML, like Gecko) Version/6.0.2 Safari/536.26.17 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Cache-Control: max-age=0 All other files linked on that page receive the right Request-Headers and Safari used cached files or 304 where appropriate. Why doesn't send Safari the correct Request-Header? What could I change? Thank you!

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