Nice article.

> Caches work great for CSS files, images and javascript - stuff that doesn't chance for each user. It doesn't work as well for the responses to API calls, for which the responses are different for each user, and sometimes, each time

Regarding this, there seems to be some people addressing the issue now (I have fly.io in mind, and maybe Vercel but I believe the latter use lambdas behind the hood so probably less effective).