Re: [squid-users] Cacheing CGI pages and the Expires and Last-modified headers

On Wed, 20 Oct 2004, Jim Nachlin wrote:

> 1098307846.311 21 127.0.0.1 TCP_REFRESH_HIT/304 220 GET
> http://192.168.2.75/test-rec.cgi - DIRECT/192.168.2.75 - [Host:
> 192.168.2.75\r\nUser-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.5)
> Gecko/20031021\r\nAccept:
> text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,image/jpeg,image/gif;q=0.2,*/*;q=0.1\r\nAccept-Language:
> en-us,en;q=0.5\r\nAccept-Encoding: gzip,deflate\r\nAccept-Charset:
> ISO-8859-1,utf-8;q=0.7,*;q=0.7\r\nKeep-Alive: 300\r\nProxy-Connection:
> keep-alive\r\nIf-Modified-Since: Wed, 20 Oct 2004 11:37:46
> GMT\r\nCache-Control: max-age=0\r\n] [HTTP/1.1 304 Not Modified\r\nDate: Wed,
> 20 Oct 2004 21:30:46 GMT\r\nServer: Apache/2.0.49 (Unix)\r\nConnection:
> close\r\nExpires: Wed, 27 Oct 2004 16:37:46 GMT\r\nCache-control:
> max-age=6000\r\n\r]
> 1098307888.934 361 127.0.0.1 TCP_REFRESH_HIT/304 220 GET
> http://192.168.2.75/test-rec.cgi - DIRECT/192.168.2.75 - [Host:
> 192.168.2.75\r\nUser-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.5)
> Gecko/20031021\r\nAccept:
> text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,image/jpeg,image/gif;q=0.2,*/*;q=0.1\r\nAccept-Language:
> en-us,en;q=0.5\r\nAccept-Encoding: gzip,deflate\r\nAccept-Charset:
> ISO-8859-1,utf-8;q=0.7,*;q=0.7\r\nKeep-Alive: 300\r\nProxy-Connection:
> keep-alive\r\nIf-Modified-Since: Wed, 20 Oct 2004 11:37:46
> GMT\r\nCache-Control: max-age=0\r\n] [HTTP/1.1 304 Not Modified\r\nDate: Wed,
> 20 Oct 2004 21:31:28 GMT\r\nServer: Apache/2.0.49 (Unix)\r\nConnection:
> close\r\nExpires: Wed, 27 Oct 2004 16:37:46 GMT\r\nCache-control:
> max-age=6000\r\n\r]

Both these are forced reloads due to the "Cache-Control: max-age=0" header
sent by your client.. this tells Squid that you (the client) does not
accept cached content unless it first has been verified fresh. This
overrides Expires or any freshness information the earlier server reply
may have (RFC 2616 14.9.4 Cache Revalidation and Reload Controls,
Specific end-to-end revalidation)

Regards
Henrik
Received on Wed Oct 20 2004 - 16:09:17 MDT