> For the complete documentation index, see [llms.txt](https://docs.console.zenlayer.com/welcome/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.console.zenlayer.com/welcome/cn/content-delivery-network/purge-and-prefetch/prefetch.md).
# 预热
输入要预热的 URL：源站将主动将文件同步到 CDN 节点。
{% hint style="info" %} **Note**
URL 预热每日限制在 200 次内。
{% endhint %}