Snippets → htaccess

# 1 YEAR
<FilesMatch ".(ico|pdf|flv)$">
Header set Cache-Control "max-age=29030400, public"
</FilesMatch>
# 1 WEEK
<FilesMatch ".(jpg|jpeg|png|gif|swf)$">
Header set Cache-Control "max-age=604800, public"
</FilesMatch>
# 2 DAYS
<FilesMatch ".(xml|txt|css|js)$">
Header set Cache-Control "max-age=172800, proxy-revalidate"
</FilesMatch>
# 1 MIN
<FilesMatch ".(html|htm|php)$">
Header set Cache-Control "max-age=60, private, proxy-revalidate"
</FilesMatch>

Source: http://www.askapache.com/htaccess/speed-up-sites-with-htacce...