> I started caching some of the static files on my application,
> I was wondering - Lets say I have an article on my website and I *want* to
> cache it. How will I cache it AND will be able to make my visitors
> "re-cache" it if it has been changed?

Work from the last modified date/time on the file. When you update the
file it will change. Though if your files really are static, then
there's little point - the OS will do a far better job of caching them
than you will.

Also, you may also want to have a goosey at the Cache-Control: HTTP
header over Expires:. It can give you more control.

> How do I use *Header set Expires* (on htaccess) and specifying "in a week"?

A quick Google found this:

Header set Expires "Thu, 15 Apr 2010 20:00:00 GMT"

Richard Heyes

HTML5 Canvas graphing for Firefox, Chrome, Opera and Safari:
http://www.rgraph.net (Updated March 28th)

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