Simon Willison’s Weblog

12th December 2007 - Link Blog

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.

Posted 12th December 2007 at 11:23 am

Recent articles

Notes on the xAI/Anthropic data center deal - 7th May 2026
Live blog: Code w/ Claude 2026 - 6th May 2026
Vibe coding and agentic engineering are getting closer than I'd like - 6th May 2026

This is a link post by Simon Willison, posted on 12th December 2007.

caching 49 http 124 mark-nottingham 14 squid 6

Monthly briefing

Sponsor me for $10/month and get a curated email digest of the month's most important LLM developments.

Pay me to send you less!

Sponsor & subscribe