Browsers are smart enough and programmers

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Browser cache The same thing happens for almost all web browsers (Firefox, Chrome, Safari, Edge etc etc): when you navigate to a certain site, the browser saves the contents in memory to then show them to us much more quickly the next time we revisit the site in question. But there is a but: what happens if the website is updated? No problem: are usually good enough) to check whether the page you are looking for exists, whether that page has an expiration date after which a page must be requested directly from the server, or whether the requested page has been updated in the meantime.


What we have described is the browser cache: it usually works perfectly congo-brazzaville business email list and transparently for users. Over the years these systems have evolved: browsers no longer treat pages as a single object but consider them a group of objects formed by various entities; and to each of these they assign (or read what the developer has indicated with particular codes) the cache expiration date. If it has passed they ask for the new version, otherwise not. What can happen then? That you have a page exactly like the one you visited in the past days, with the same contents, but to which we have replaced an image, or we have modified the style through the css or the javascript code.