How do I set expiration on CSS, JS and Images?

Question

I have recently analysed my website with pagespeed addon on firebug. It suggested me to set expiration on CSS, JS and image files.

I am wondering, how do I do this?

Answer 1

i would like to add this solution for those searching for it....

its also works great...using .htaccess

https://webmasters.stackexchange.com/a/5275/37765

 
  ExpiresActive On
  ExpiresDefault A2592000