<ifModule mod_expires.c>
ExpiresActive On
ExpiresDefault "access plus 30 minutes"
ExpiresByType text/html "access plus 10 seconds"
ExpiresByType text/css "access plus 10 seconds"
ExpiresByType image/jpg "access plus 7 days"
ExpiresByType image/jpeg "access plus 7 days"
ExpiresByType image/gif "access plus 7 days"
ExpiresByType image/png "access plus 7 days"
ExpiresByType application/pdf "access plus 1 month"
ExpiresByType text/x-javascript "access plus 1 month"
ExpiresByType application/javascript "access plus 7 days"
ExpiresByType application/x-javascript "access plus 1 month"
ExpiresByType application/x-shockwave-flash "access plus 1 month"
ExpiresByType image/x-icon "access plus 1 month"
</ifModule>
ブラウザキャッシュを有効にしつつCSSファイルも更新させる方法【サイト軽量化＆高速化計画】