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Use Apache's mod_expires module to set the expiry header for the generated page so that browsers don't cache it for longer than its intended lifetime.
<VirtualHost *:80> ServerName news.example.com DocumentRoot /var/www/<zeitgeist-web-root> ExpiresActive On ExpiresByType text/html "modification plus 30 minutes" </VirtualHost>
This example expires the page 30 minutes after it is generated. This is ideal if your cron job regenerates the page every half hour.