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I am checking files that are cached in my firefox browser and I note a load of them have an expires (Expires:) of:
"1970-01-01 00:00:00" expires header
This must be a common setting with a common meaning. What exactly? No expiration set?
Any tips?
It means the page expires
1970-01-01 00:00:00Which means that they have already expired, this forces the browser to request a fresh version of them every time. Therefore they are not retrieved from the browsers cache.
Here’s some more info:
http://developer.yahoo.com/performance/rules.html#expires