# CDN

One setting for every static site in the workspace, built into each site when it deploys, so a change takes effect on each site's next deploy, or at once when you press Apply now on Dashboard → Shield (or `POST /api/services/cdn`), which puts the saved CDN and Shield settings on every live static site. Blocking countries is in Shield.

## Settings

| Setting | Meaning |
| --- | --- |
| `cacheTtlSeconds` | How long the edge keeps each page and file, and browsers keep files such as images, scripts and styles (default 3,600 seconds). Browsers check HTML pages again on every visit, so a page never goes stale in someone's browser. |
| `enabled` | Turning the CDN off stops caching: every visit is served fresh. |

> The edge keeps a copy per deployment, so a redeploy shows at once: nothing has to be cleared. Server apps, worker.js programs and functions are not affected by this setting yet. Changing it needs an owner or admin.

## Where to change them

- Dashboard → CDN, or `PUT /api/services/cdn` (the body is merged over the saved settings), or an owner's or admin's AI assistant with `get_service_config` and `update_service_config`.

## Reference

**REST**

```http
GET /api/services/cdn · PUT /api/services/cdn  { "enabled": true, "cacheTtlSeconds": 3600 }
```