vue-vben-admin/apps/backend-mock/middleware/1.api.ts

export default defineEventHandler((event) => {
  event.node.res.setHeader(
    'Access-Control-Allow-Origin',
    event.headers.get('Origin') ?? '*',
  );
  if (event.method === 'OPTIONS') {
    event.node.res.statusCode = 204;
    event.node.res.statusMessage = 'No Content.';
    return 'OK';
  }
});