cached pages are not invalidated/deleted?

  • Hi,
    i understood that the “Expires header lifetime:” in browser page determines the “life” of a cached page; is that true? I am asking this because it doesn’t seem to work for me.

    My problem is that cached pages are never invalidated/deleted. I need to “empty all cache” if I want to see some modification that doesn’t relay specifically to wordpress.

    So my very basic question is:
    Is there a way to invalidate cached pages (preferably with disk enhanced but even with disk basic ) every 1200 secs to have my site always refreshed? How can I reach this goal?

    Is there something I should change in object/database cache too? At the moment cache values for both are the standard ones.

    Many thanks,
    Marcello

    https://www.ads-software.com/plugins/w3-total-cache/

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