Generally by default CDNs don't necessarily cache anything. They just (try to) respect the cache headers that the developer provides in the response from the origin web server
So it's still up to the developer to provide the correct headers otherwise you don't get too much of a benefit
That said some of them will do some default caching if it is recognized as a static file etc
I didn't know this. While reading up on CDNs I was led to believe that they were a revolutionary idea for the kind of fast access we have to the Internet.
So it's still up to the developer to provide the correct headers otherwise you don't get too much of a benefit
That said some of them will do some default caching if it is recognized as a static file etc