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How does HTTP Caching work when using CDN ( Content Delivery Networks )

Want to learn and understand the basics of HTTP, CDN, Cookies and GET/POST requests? Want to speed up your site? You need to use CDN. This is really good read.

From the article:

Using CDNs has long been something in the domain of the Alexa top 100; something a small(er) website does not need or cannot afford. This has changed over the last years, with a multitude of pay-per-use, non-enterprise vendors on the market CDNs became affordable for everybody. This article intends to show you how to get started with this easy to use caching variant.