如何在nuxt.js中实现www到非www的重定向

export default {
  server: {
    port: 3000, // 默认端口号为3000
    host: '0.0.0.0', // 通过Nginx反向代理时需要设为0.0.0.0
  },
}

server {
  listen 80;
  server_name www.example.com;

  return 301 http://example.com$request_uri;
}

server {
  listen 80;
  server_name example.com;

  location / {
    proxy_pass http://localhost:3000;
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection 'upgrade';
    proxy_set_header Host $host;
    proxy_cache_bypass $http_upgrade;
  }
}

export default function ({ req, res, redirect }) {
  const host = req.headers.host || ''
  const isWWW = host.includes('www.')
  
  if (isWWW) {
    const redirectURL = `https://${host.replace('www.', '')}${req.url}`
    return redirect(301, redirectURL)
  }
}

export default {
  router: {
    middleware: 'redirect'
  }
}