Hello, A past discussion in list back to the year of 2001 said not possible: http://www.squid-cache.org/mail-archive/squid-users/200112/0880.html Any updates now? Consider the following case: You have a blog application, and use Squid as reverse proxy to cache the dynamic pages. Ideally, if user updated an article, you need to purge all pages from the blog (consider all pages contains a sidebar item of recent articles - need to be updated), Sure you can't loop all the pages and do the purge one by one... Then you need a way to purge by domain or subdomain, or even by folder... Roy