Добавьте в ваш файл .htaccess следующий код:
ExpiresActive on
FileETag MTime Size
# Задаем значение по умолчанию (для всех файлов)
ExpiresDefault "access plus 1 month"
# Ваш html документ
ExpiresDefault "access plus 0 seconds"
ExpiresByType text/html "access plus 0 seconds"
# Данные
ExpiresByType text/xml "access plus 0 seconds"
ExpiresByType application/xml "access plus 0 seconds"
ExpiresByType application/json "access plus 0 seconds"
# Рассылка
ExpiresByType application/rss+xml "access plus 1 hour"
ExpiresByType application/atom+xml "access plus 1 hour"
# Favicon (не может быть переименован)
ExpiresDefault "access plus 1 week"
ExpiresByType image/x-icon "access plus 1 week"
# Медиа: изображения, видео, аудио
ExpiresDefault "access plus 1 year"
ExpiresByType image/gif "access plus 1 month"
ExpiresByType image/png "access plus 1 month"
ExpiresByType image/jpeg "access plus 1 month"
ExpiresByType video/ogg "access plus 1 month"
ExpiresByType audio/ogg "access plus 1 month"
ExpiresByType video/mp4 "access plus 1 month"
ExpiresByType video/webm "access plus 1 month"
# Веб-шрифты
ExpiresDefault "access plus 1 year"
ExpiresByType application/x-font-ttf "access plus 1 month"
ExpiresByType font/opentype "access plus 1 month"
ExpiresByType application/x-font-woff "access plus 1 month"
ExpiresByType image/svg+xml "access plus 1 month"
ExpiresByType application/vnd.ms-fontobject "access plus 1 month"
# CSS и JavaScript
ExpiresDefault "access plus 1 year"
ExpiresByType text/css "access plus 1 year"
ExpiresByType application/javascript "access plus 1 year"
# Статичные ресурсы
ExpiresDefault "access plus 1 year"
ExpiresByType application/x-shockwave-flash "access plus 1 year"
ExpiresByType application/pdf "access plus 1 year"
ExpiresByType application/msword "access plus 1 year"
ExpiresByType application/rtf "access plus 1 year"
ExpiresByType application/vnd.ms-excel "access plus 1 year"
ExpiresByType application/vnd.ms-powerpoint "access plus 1 year"
