<FilesMatch "\.(js|css)$">
header append Cache-Control "public, last-modified, must-revalidate"
</FilesMatch>
+ExpiresActive On
+ExpiresByType image/jpg "access plus 4 days"
+ExpiresByType image/png "access plus 4 days"
+ExpiresByType image/mp3 "access plus 4 days"
+