paulirish/lazyweb-requests — Issue #50: Document browser caching behavior
Author: akavlie
Created: 2012-02-08 01:27:26+00:00
State: open

Even if you don't specify cache expiration properly in HTTP headers, despite all the warnings generated by tools like the Webkit auditor or YSlow, Chrome & Firefox pull static assets from local cache on subsequent visits to a site. It's difficult to find good information via Google/Stack Overflow searches about how this works, and the browsers themselves don't clearly report expiration dates.

How long will assets be cached? If assets are cached & retrieved locally regardless of server cache expiration headers, are the headers really that important?