When fetch runs on the server, the resulting response will be serialized and inlined into the rendered HTML. This allows the subsequent client-side load to access identical data immediately without an additional network request.

use an intercepting proxy server with a built-in cache

Take responsibility for your outgoing network traffic If you install software that interacts with other sites over the network, you should be aware how it works and what kind of traffic it generates. If it has the potential to make thousands of requests to other sites, make sure it uses an HTTP cache to prevent inflicting abuse on other sites.