Express's app.get(), PHP's file-to-URL mapping, Laravel's routes/web.php, whatever Django or Rails call it — every one of them is the same three-part idea from the first slide, wearing different syntax: match a request, run some code, send a response. Nothing about that idea is exotic. You've now read it in two languages and made real requests against production instances of it — covenant.to, Open-Meteo — using three different clients. The next time an agent generates a server for you, you'll recognize exactly what it's doing.