Simon Willison’s Weblog

HTTP Cache Channels (via) Interesting extension to the HTTP caching model by Mark Nottingham: caches can be told to subscribe to an Atom feed which alerts them to cached data that has gone stale. Group invalidation is also supported. 4th January 2008, 12:48 pm

Two HTTP Caching Extensions. stale-while-revalidate serves cached content even while a refresh has been triggered and is currently being pulled in to the cache; stale-if-error serves cached content if a service has gone down. 12th December 2007, 11:23 am

ETags, ETags, ETags. They’re no magic bullet. 7th August 2007, 2:51 pm

The State of Proxy Caching. If you’ve always wondered exactly what intermediate proxies are going to do to your carefully constructed Web application, here’s your answer. 21st June 2007, 2:18 pm