next-middleware-6.ts

export async function middleware(request: NextRequest) {
  const response = NextResponse.next();
  for await (const middlewareFunction of MIDDLEWARES) {
    const middlewareResponse = await middlewareFunction(request, response);
    if (isRedirecting(middlewareResponse)) {
      return middlewareResponse;
    }
    if (isRewriting(middlewareResponse)) {
      return middlewareResponse;
    }
  }
  return response;
}
function isRedirecting(response: NextResponse): boolean {
  return response.status === 307 || response.status === 308;
}
function isRewriting(response: NextResponse): boolean {
  return response.headers.has('x-middleware-rewrite');
}