monolithic/overlay/etc/nginx/sites-available/cache.conf.d/22_wsus_cabs.conf

  # Fix for WSUS authroot cab files
  location ~* (authrootstl.cab|pinrulesstl.cab|disallowedcertstl.cab)$ {
    proxy_cache_bypass 1;
    proxy_no_cache 1;
    proxy_pass http://$host$request_uri;
  }