How does CloudFlare's 'purge' feature work?

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I've adjusted the expiration tags on many of the files of my website (with .htaccess). As you know, this can create a tiny problem of a users browser not showing the most updated version of a website until the cached version of the file expires.

I began looking for a way to avoid this and then I remembered using CloudFlare some time ago. CloudFlare makes it possible to adjust these same tags but it also has a purge feature. What is 'purge' doing?

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Purge is telling us to purge the files that CloudFlare has cached on your site. You can do for the whole site (purge cache) or purge by single file.