Proxy (Middleware) और Redirects

// proxy.js  (project root – EduSite, complete file)
import { NextResponse } from 'next/server'

// Old URLs like /course/python-ai are permanently moved to /courses/python-ai.
export function proxy(request) {
  const { pathname } = request.nextUrl
  if (pathname.startsWith('/course/')) {
    const url = request.nextUrl.clone()
    url.pathname = pathname.replace('/course/', '/courses/')
    return NextResponse.redirect(url, 308)       // 308 = permanent (SEO keeps ranking)
  }
  return NextResponse.next()                     // continue normally
}

export const config = { matcher: ['/course/:path*'] }

export const config = {
  matcher: [
    '/dashboard/:path*',          // /dashboard and everything below
    '/admin/:path*',
    // everything EXCEPT static files, images and API:
    '/((?!api|_next/static|_next/image|favicon.ico|.*\\.png$).*)',
  ],
}

// proxy.js — show a maintenance page without changing the URL
import { NextResponse } from 'next/server'

export function proxy(request) {
  if (process.env.MAINTENANCE === 'on' && !request.nextUrl.pathname.startsWith('/maintenance')) {
    return NextResponse.rewrite(new URL('/maintenance', request.url))
  }
  return NextResponse.next()
}

// proxy.js — add a header and remember the referral code from ?ref=
import { NextResponse } from 'next/server'

export function proxy(request) {
  const res = NextResponse.next()
  res.headers.set('X-Frame-Options', 'DENY')                   // security header

  const ref = request.nextUrl.searchParams.get('ref')
  if (ref) res.cookies.set('ref', ref, { maxAge: 60 * 60 * 24 * 30 })   // 30 days
  return res
}

# Next.js provides a codemod:
npx @next/codemod@latest middleware-to-proxy .

// Before (Next.js 15)          // After (Next.js 16)
// middleware.js                // proxy.js
export function middleware(req) { }   →   export function proxy(req) { }