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Thirteen fixes for the routing problems Next.js 16 developers hit most, from route modals and missing default.js files to active links, URL state, scroll, i18n, protected sections and basePath.
How the App Router turns folders and special files into a loader tree, how that tree becomes nested layouts, boundaries and slots, and what dynamic, grouped, parallel and intercepted segments really do in Next.js 16.4.3.
How route.ts handlers are dispatched and when a GET is prerendered, and how proxy.ts (the renamed middleware) runs before routing, matches paths and talks to the router through response headers.