Frank DENIS random thoughts. For many people, CDNs are an obvious requirement for any public API or web service. However, I’ve come to realize that for the vast majority, they remain somewhat mysterious - or something they’re unaware of, even though they unknowingly use them daily. So, here’s a very accessible, hands-on illustration of what a CDN does, using Fastly as an example. What do CDNs do? A CDN is a cloud service that can be added in front of existing web servers. Instead of connecting d...