## The short version

Move CDN delivery from Cloudflare CDN configuration to Ample, one component at a time. Destination verified on Ample: a generated CSV stored with a Content-Disposition attachment header and served from the CDN URL with that header intact, so browsers download it under the stored filename. Source procedure: Record page rules, cache rules and the asset paths the app references. Not migrated automatically: Cloudflare cache rules, Workers, Transform Rules and tiered caching are not migrated; Ample verifies delivery of published bucket objects only. Cutover: Redeploy the app with the new asset base URL, verify delivery from the CDN URL, then retire the old cache rules. Rollback: keep the source untouched until you confirm; nothing at the source is changed or deleted by this guide.

## What it needs

- [CDN](/content/discover/primitive/cdn/index.html): verified (A published bucket's objects are served at its public_url. It does not front app compute and is not a cache or key-value store.)

## Before you start

- Authorized access to the Cloudflare CDN configuration source and its export tooling
- An inventory of every component in scope and out of scope
- A validated backup or copy before any cutover
- An Ample account token with servers:write, buckets:write

## How to do it

1. 1

### Inventory the source

List what Cloudflare CDN configuration provides beyond the component you are moving. Out of scope here: Cloudflare cache rules, Workers, Transform Rules and tiered caching are not migrated; Ample verifies delivery of published bucket objects only.

2. 2

### Source step 1

Record page rules, cache rules and the asset paths the app references

3. 3

### Source step 2

Copy the public assets into a published Ample bucket under versioned keys with immutable Cache-Control

4. 4

### Source step 3

Update the app to build asset URLs from the Ample public URL

5. 5

### Publish the destination bucket

Create and publish the asset bucket, upload versioned assets with immutable Cache-Control, and point the app at the public URL.

```
    ample bucket publish <bucket-name>
    ```

6. 6

### Validate before cutover

Run the app's own checks and, for data, compare counts and checksums; the example checks are the pattern self-tests (/p/downloadable-file-delivery).

7. 7

### Cut over

Redeploy the app with the new asset base URL, verify delivery from the CDN URL, then retire the old cache rules.

8. 8

### Rollback

Point DNS or configuration back to the source. The source was never modified; deletion is a separate, user-executed step after validation.

## Tested examples

- **Next.js pattern fixture (destination)** (`tests/deploy-canaries/next-js-patterns`): Verified destination basis: downloadable file delivery.

## How to know it worked

- destination app responds on its public URL (`/` on the live URL, expect ample canary next js patterns)
- downloadable-file-delivery check from the destination example (`/p/downloadable-file-delivery` on the live URL, expect see the pattern fixture checks)
- data or object counts and checksums match the source

## Cost estimate

Estimated 5.00 USD per month (size prices from pricing.toml at build revision ca0b484a7a9957c573a88d3a32dc603c3c10135a).

- app server x1 `s-1vcpu-1gb`: 5.00 USD

Upper-bound monthly price of the tested sizes at the destination. Source costs are unknown to Ample.

## Verification evidence

- canary_run on 2026-09-21T02:34:39Z at revision `1d28ae0 (CLI 0.1.21)`: Destination side verified: the Next.js pattern fixture deployed on Ample (next build then next start -H 0.0.0.0 -p $PORT on the node-22 template) and its checks passed (a generated CSV stored with a Content-Disposition attachment header and served from the CDN URL with that header intact, so browsers download it under the stored filename). The source-side export from Cloudflare CDN configuration is documented from the vendor's standard tooling and was not executed by this catalog's evidence. (expires 2027-03-20T02:34:39Z)

## Execution binding

No execution binding. This recipe is documentation only; nothing is executed automatically.