Yeh, I'm pretty sure this is easy for everyone here but it's new to me.
I have this notice from my page and I want to follow the instruction
"The following cacheable resources have a short freshness lifetime.
Specify an expiration at least one week in the future for the following resources:"
etc it lists all the images on the page
I'm not sure what is the best / correct way to do this
Do I have to set the expire header like this at the top of my page
and change it on a weekly basis? (can't be right)
header('Expires: Fri, 01 Jan 2012 05:00:00 GMT');
Help much appreciated