[youngtaff]

CDNs aren't limited to just static content, it's quite common for large dynamic sites to deliver their base pages though CDNs.

They can use features like ESI to assemble the final page on the edge from static and dynamic parts, or they can just act as a proxy to the origin with the dynamic page generated there.

Even when the CDN is just acting as a proxy back to the origin there can be performance advantages e.g. lower latency TCP and TLS negotiation between edge to client, and permanent connection between edge and origin i.e. single TCP negotiation for all clients, larger congestion windows leading to higher throughput.

In short CDNs aren't just for static content!