Apache caching

sites-available/share.yyssc.org.conf

<VirtualHost *:80>
#...
    # Client caching with mod_expires
    <IfModule mod_expires.c>
        ExpiresActive On
        ExpiresByType image/gif A3600
    </IfModule>
#...
</VirtualHost>

• http://httpd.apache.org/docs/2.0/mod/mod_expires.html
• https://stackoverflow.com/a/7699524
• https://github.com/ficloud/172.20.4.222/blob/master/etc/httpd/sites-available/share.yyssc.org.conf