Thanks Marc for letting me know about Squid's adaptive mechanisms for estimating freshness time.
Can anyone tell me if this is common to other proxy servers? Do they possess this mechanism? Is it set on by default? Thanks Manfred -----Original Message----- From: Marc Elsen [mailto:[EMAIL PROTECTED] Sent: 05 December 2003 08:38 To: Manfred Milhofer Subject: Re: [squid-users] Thank you, and.. >... >Now, I have already started to learn the Apache techniques to configure these >>headers (Apache powers Oracle Portal), but my question >is this: given the lack of freshness information here, would it not be expected for >>a proxy server to always retrieve from the origin server, >in case its cached copy was out of date? Or is it precisely this lack of >information >... --> No, squid uses an adpative mechanism, to estimate possible remaining freshness time for objects which did not have an explicit expiration time set. It's only after that period has expired that squid will issue an 'if-modify-since' request for the particular object to the remote webserver. You can modify this algorythms parameters : Checkout the directive 'refresh_pattern' in squid.conf. You could adapt this paremeter for your needs but the best solution remains giving correct expiration info for relevant objects (docs). M. -- 'Love is truth without any future. (M.E. 1997) --- Incoming mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.545 / Virus Database: 339 - Release Date: 27/11/2003 --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.545 / Virus Database: 339 - Release Date: 27/11/2003
