# Patroon: Proxy (route protection)

In Next.js 16 hernoemd van `middleware.ts` naar `proxy.ts`, functienaam van `middleware` naar `proxy`.

```ts
// proxy.ts
import { NextResponse } from 'next/server'
import type { NextRequest } from 'next/server'
import { sessionOptions } from '@/lib/session'

const protectedRoutes = ['/dashboard', '/products', '/todos', '/settings']
const authRoutes = ['/login', '/register']

export function proxy(request: NextRequest) {
  const path = request.nextUrl.pathname
  const isProtected = protectedRoutes.some(r => path.startsWith(r))
  const isAuthRoute = authRoutes.some(r => path.startsWith(r))

  // Cookie-aanwezigheid controleren — volledige sessievalidatie in layout.tsx
  const hasSession = !!request.cookies.get(sessionOptions.cookieName)?.value

  if (isProtected && !hasSession) {
    return NextResponse.redirect(new URL('/login', request.url))
  }
  if (isAuthRoute && hasSession) {
    return NextResponse.redirect(new URL('/dashboard', request.url))
  }

  return NextResponse.next()
}

export const config = {
  matcher: ['/((?!api|_next/static|_next/image|favicon.ico).*)'],
}
```