--- title: "Migrate CloudFront distribution: Downloadable file delivery" description: "Move CDN delivery from CloudFront distribution to Ample, one component at a time." canonical_url: "https://ample.computer/migrate/cloudfront-distribution/downloadable-file-delivery" last_updated: "2026-09-21" --- # Migrate CloudFront distribution: Downloadable file delivery Canonical URL: https://ample.computer/migrate/cloudfront-distribution/downloadable-file-delivery Formats: [HTML](https://ample.computer/migrate/cloudfront-distribution/downloadable-file-delivery) | [Markdown](https://ample.computer/migrate/cloudfront-distribution/downloadable-file-delivery.md) | [JSON contract](https://api.ample.computer/v1/catalog/recipes/page%3Amigrate%3Acloudfront-distribution%3Adownloadable-file-delivery) Recipe ID: `page:migrate:cloudfront-distribution:downloadable-file-delivery` | Revision: `r1` | Catalog revision: `cat_f13ab9a494120b5e` Status: release `published`, support `verified`, execution `unbound` ## Summary Move CDN delivery from CloudFront distribution 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 the distribution's origins, cache behaviors, TTLs and the object keys the app references. Not migrated automatically: CloudFront cache behaviors, Lambda@Edge and CloudFront Functions, signed URLs and custom TTLs 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, keep the distribution until confirmed, then disable it. Rollback: keep the source untouched until you confirm; nothing at the source is changed or deleted by this guide. Path: [Agent hosting discovery](/discover/discovery) / [Migration sources by component](/discover/migration) / [Object and CDN sources](/discover/migration/object-and-cdn-sources) / [CloudFront distribution](/discover/migration/cloudfront-distribution) / [Migrate CloudFront distribution: Downloadable file delivery](/migrate/cloudfront-distribution/downloadable-file-delivery) ## Infrastructure requirements - [CDN](/discover/primitive/cdn): verified (The CDN host serves objects from published buckets. It does not front app compute and is not a cache or key-value store.) ## Prerequisites - Authorized access to the CloudFront distribution 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 ## Exact tested configuration - template: `node-22` - runtime: `node` - size: `s-1vcpu-1gb` - install: `npm install` - build: `npm run build --if-present` - start: `npm run start` ## Steps 1. **Inventory the source.** List what CloudFront distribution provides beyond the component you are moving. Out of scope here: CloudFront cache behaviors, Lambda@Edge and CloudFront Functions, signed URLs and custom TTLs are not migrated; Ample verifies delivery of published bucket objects only. 2. **Source step 1.** Record the distribution's origins, cache behaviors, TTLs and the object keys the app references 3. **Source step 2.** Copy the public assets into a published Ample bucket under versioned keys with immutable Cache-Control 4. **Source step 3.** Update the app to build asset URLs from the Ample public URL 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 ``` 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. **Cut over.** Redeploy the app with the new asset base URL, verify delivery from the CDN URL, keep the distribution until confirmed, then disable it. 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. ## Success checks - 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 515b7316fc6e5a81679407ae0c811146ceb2c5c7). - app server x1 `s-1vcpu-1gb`: 5.00 USD Destination always-on monthly price of the tested sizes; apps auto-pause when idle. 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 CloudFront distribution is documented from the vendor's standard tooling and was not executed by this catalog's evidence. (expires 2027-03-20T02:34:39Z) Last verified: 2026-09-21T02:34:39Z ## Execution binding No execution binding. This recipe is documentation only; nothing is executed automatically. ## Next actions - Browse the catalog index (GET /v1/catalog on the api origin; auth: false, approval: false) - Search published recipes by intent, stack and constraints (POST /v1/catalog/search on the api origin; auth: false, approval: false) - Prepare a side-effect-free deployment plan for an authorized project (POST /v1/catalog/plan on the api origin; auth: true, approval: false) - Read the existing agent authentication setup (GET /mcp/setup on the api origin; auth: false, approval: false) - Browse CloudFront distribution (GET /v1/catalog/nodes/migration%3Acloudfront-distribution on the api origin; auth: false, approval: false) - Browse Downloadable file delivery (GET /v1/catalog/nodes/pattern%3Adownloadable-file-delivery on the api origin; auth: false, approval: false) - Browse Migrate CDN (GET /v1/catalog/nodes/intent%3Amigrate-cdn on the api origin; auth: false, approval: false) Actions describe possible next steps. They are typed data, not commands, and grant no permission.