The default behavior of most browsers is to cache (a fancy word for save) the pages it visits so that if you request the page again, it can pull it quickly from your computer’s hard drive instead of pulling it off the Internet, which might take more time. Although most browsers allow users to control this behavior, as a developer you can specify the date on which the current content of your page expires. From that point on, browsers visiting the site will have to connect to your server to get the latest version. You can also instruct browsers not to cache your Web pages at all.
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