// Heavy Client Redirect Scripts
// Causes white flashes & cumulative layout shifts
window.onload = function() {
  if (Math.random() > 0.5) {
    window.location.href = '/landing-variant-b';
  }
};

// UNICX Edge Middleware A/B testing
import { NextResponse } from 'next/server';
import type { NextRequest } from 'next/server';

export function middleware(req: NextRequest) {
  // Instant routing decisions running at cloud edge edge node
  const variant = req.cookies.get('variant')?.value || 'A';
  return NextResponse.rewrite(new URL(`/landing/${variant}`, req.url)); // [!code highlight]
}