ExpiresActive On
ExpiresDefault A6048000
FileETag none
Header unset Etag
Header unset Last-Modified
Header set Cache-Control "public"

<FilesMatch "\.(pl|php|cgi|spl|scgi|fcgi|html?)$">
Header set Cache-Control "private, must-revalidate, proxy-revalidate"
ExpiresDefault A0
ExpiresActive Off
</FilesMatch>

http://wiki.dennyhalim.com/htaccess

long htaccess expired header for all files except for server side scripts

super over simplified cache control and expire header htaccess

header, simple, htaccess, cache

Apache