magento Optimizing Magento For Speed Enabling Expires Headers
Example
First-time visitors to any web page has to make several HTTP requests. By using the “Expires” header you make the components of the requests cacheable. This avoids unnecessary HTTP requests on subsequent page views.
You want to find the area of the .htaccess file that starts with <IfModulemod_expires.c> and ends with the first you see after it, and make it look like this:
<IfModule mod_expires.c>
############################################
## Add default Expires header
## http://developer.yahoo.com/performance/rules.html#expires
ExpiresActive On
ExpiresDefault "access plus 1 year"
</IfModule>
