i use this, which was posted by willyc somewhere, just pulled it from my code snippets:
what.i use this is
good it does.work
top {not buttock}, of htaccess u
will.put it . enjoy
<IfModule mod_expires.c>
ExpiresActive On
ExpiresDefault "access plus 1 seconds"
ExpiresByType image/x-icon "access plus 1 year"
ExpiresByType image/jpeg "access plus 1 year"
ExpiresByType image/png "access plus 1 year"
ExpiresByType image/gif "access plus 1 year"
ExpiresByType text/css "access plus 1 month"
ExpiresByType text/javascript "access plus 1 month"
ExpiresByType application/octet-stream "access plus 1 month"
ExpiresByType application/x-javascript "access plus 1 month"
</IfModule>
<IfModule mod_headers.c>
<FilesMatch "\\.(ico|jpe?g|png|gif|swf|woff)$">
Header set Cache-Control "max-age=31536000, public"
</FilesMatch>
<FilesMatch "\\.(css)$">
Header set Cache-Control "max-age=2692000, public"
</FilesMatch>
<FilesMatch "\\.(js)$">
Header set Cache-Control "max-age=2692000, private"
</FilesMatch>
<FilesMatch "\.(js|css|xml|gz)$">
Header append Vary: Accept-Encoding
</FilesMatch>
Header unset ETag
Header append Cache-Control "public"
</IfModule>
<IfModule mod_deflate.c>
AddOutputFilter DEFLATE js css
AddOutputFilterByType DEFLATE text/html text/plain text/xml application/xml
BrowserMatch ^Mozilla/4 gzip-only-text/html
BrowserMatch ^Mozilla/4\.0[678] no-gzip
BrowserMatch \bMSIE !no-gzip !gzip-only-text/html
</IfModule>