This issue is triggered if browser caching is not specified in the response header. Enabling browser caching
requesting your page. That way the browser will download less data, which will decrease your page load time. And the less
time it takes to load your page, the happier your visitors are. For more information, please see this Google article
don’t own, contact the website owner and ask them to enable browser caching for them.
However, some time you will find that after your are aware of server and client side cache but http requests as above example referring to belongs to some pixels or analytics tools which can not be cached on client side.