Установлен плагин Hyper Cache с дефолтными настройками и добавлен код в .htaccess, который отдает заголовки ‘Expires’ по типам файлов:
<ifModule mod_expires.c>
ExpiresActive On
# Cache Images
ExpiresByType image/x-icon "access plus 2592000 seconds"
ExpiresByType image/jpeg "access plus 2592000 seconds"
ExpiresByType image/png "access plus 2592000 seconds"
ExpiresByType image/gif "access plus 2592000 seconds"
# Cache other content types (Flash, CSS, JS, HTML, XML)
ExpiresByType application/x-shockwave-flash "access plus 2592000 seconds"
ExpiresByType text/css "access plus 604800 seconds"
ExpiresByType text/javascript "access plus 2592000 seconds"
ExpiresByType application/javascript "access plus 2592000 seconds"
ExpiresByType application/x-javascript "access plus 2592000 seconds"
ExpiresByType text/html "access plus 600 seconds"
ExpiresByType application/xhtml+xml "access plus 600 seconds"
</ifModule>
