I have a question about the "Date" in response header. As I know, the "Date" should be the just time when the server response the request. But If I request through squid2.6 as a cache server, I get the right "Date" only the first time! Squid return the same "Date"/"Expires"...after the second request. I guess that squid might return the headers exist in the cache file. I strings one file and see text as follows: http://tech.china.com/zh_cn/mobile/market/11025044/20080102/images/2008010209212895055100.jpg HTTP/1.1 200 OK Server: nginx/0.7.62 Date: Fri, 03 Sep 2010 12:40:54 GMT Content-Type: image/jpeg Content-Length: 47072 Last-Modified: Wed, 02 Jan 2008 01:15:06 GMT Connection: keep-alive Expires: Fri, 03 Sep 2010 13:10:54 GMT Cache-Control: max-age=1800 Accept-Ranges: bytes But when I test a url through a CDN's cache, I see the "Date" changes every test. wget -S http://images7.moonbasa.com/ProductImg/Middle/WX10010090M01.jpg -O /dev/null --22:00:09-- http://images7.moonbasa.com/ProductImg/Middle/WX10010090M01.jpg Resolving images7.moonbasa.com... 123.183.210.173 Connecting to images7.moonbasa.com|123.183.210.173|:80... connected. HTTP request sent, awaiting response... HTTP/1.1 200 OK Server: DnionOS/1.0 Date: Fri, 03 Sep 2010 14:00:22 GMT Content-Type: image/jpeg Connection: keep-alive Cache-Control: max-age=31104000 Content-Length: 13726 Last-Modified: Mon, 23 Aug 2010 09:06:04 GMT Accept-Ranges: bytes ETag: "2074f569a242cb1:1b20" Vary: Accept-Encoding X-Powered-By: ASP.NET X-Cache: MISS from CT-SHBA-177-211.fastcdn.com Age: 12119 X-Cache: HIT from CT-QHD-210-146.fastcdn.com Length: 13726 (13K) [image/jpeg] Is there anything wrong?
