Speed Tips: Add Cache-Control Headers
Using Cache-Control headers you can specify which types of proxies can cache certain content, and how long files should be cached.
Speed Tips: Turn Off ETags
By removing the ETag header, you disable caches and browsers from being able to validate files, so they are forced to rely on your Cache-Control and Expires header.
Speed up your site with Caching and cache-control
Caching with .htaccess and Apache will take your website and your web skills to the next level. This is some technical and advanced methods condensed to simple htaccess code examples for you.
Speed Up Sites with htaccess Caching
2 awesome ways to implement caching on your website using Apache .htaccess or httpd.conf. Both methods are extremely simple to set up and will dramatically speed up your site!