page:guides:flask:cdn assets

Deliver public assets through CDN for Flask

Summary

Cdn assets for a Flask app on Ample. Verified on Flask: a versioned, immutable-cached asset uploaded to a published bucket and served from the CDN URL. Build and start: pip install into .ample/python from requirements.txt, then waitress from app.py reading PORT on the python-3.12 template.

Prerequisites

• A Flask project (pip install into .ample/python from requirements.txt, then waitress from app.py reading PORT on the python-3.12 template).
• A bucket from ample bucket create with credentials passed as encrypted S3_* environment variables.
• An Ample account token with servers:write, buckets:read.

Workload

Deliver public assets through CDN.

Framework

Flask

Tested Configuration

• Template: python-3.12
• Runtime: python
• Size: s-1vcpu-1gb
• Install: python3 -m pip install --target .ample/python -r requirements.txt
• Start: PYTHONPATH=.ample/python:${PYTHONPATH:-} python3 app.py

Workflow Steps

1. Build and start
   pip install into .ample/python from requirements.txt, then waitress from app.py reading PORT on the python-3.12 template; the server must bind 0.0.0.0 on PORT.
2. Publish a bucket for public assets
   Publish only the asset bucket; upload versioned keys with an immutable Cache-Control header and build URLs from its public URL.
   ample bucket publish
3. Verify
   Fetch the live URL and /p/versioned-static-assets on the example; on failure read the build and runtime logs.
   ample logs --kind build

Limitations

• Verified on the python-3.12 template at s-1vcpu-1gb; other sizes and Flask major versions are not verified.
• Region, compliance attestations and request-duration limits are unknown and not claimed.
• The CDN serves published-bucket objects only; cache rules, purge and TTL control are not verified.

Cost Estimate

• Currency: USD
• Monthly Amount: 5.0
• Basis: Size prices from pricing.toml (loaded by the API) at build revision 1ac5595375130d45290090e82ed0f554ccd45405-dirty
• Components:
  • Name: app server
    Size: s-1vcpu-1gb
    Quantity: 1.0
    Monthly Amount: 5.0
• Note: Always-on monthly price of the tested sizes; apps auto-pause when idle. Buckets are allocation-priced per quota and not included.

Evidence Summary

• Kind: canary_run
  Summary: Flask pattern fixture deployed on Ample (pip install into .ample/python from requirements.txt, then waitress from app.py reading PORT on the python-3.12 template); for this guide: a versioned, immutable-cached asset uploaded to a published bucket and served from the CDN URL. Observed At: 2026-09-21T01:14:18Z
• Known Unknowns: region availability is unknown until a verified region fact is recorded, compliance attestations are unknown; none are claimed.

Examples

• Flask pattern fixture
  Verified CDN assets on Flask.
  Source Reference: tests/deploy-canaries/flask-patterns

Success Checks

1. Description: app responds on its public URL
   Kind: http_get
   Path: /
   Expect: ample canary flask patterns
2. Description: versioned-static-assets check from the example
   Kind: http_get
   Path: /p/versioned-static-assets
   Expect: see the pattern fixture checks

Next Actions

• Browse the catalog index
  Operation ID: catalog_index
  Method: GET
  Relative Path: /v1/catalog
• Search published recipes by intent, stack and constraints
  Operation ID: search_recipes
  Method: POST
  Relative Path: /v1/catalog/search
  Parameters:

  {
    "body": {
      "limit": 5,
      "query": "Deliver public assets through CDN for Flask"
    }
  }
  

• Prepare a side-effect-free deployment plan for an authorized project
  Operation ID: plan_deployment
  Method: POST
  Relative Path: /v1/catalog/plan
  Parameters:

  {
    "body": {
      "inputs": {},
      "projectId": "",
      "recipeId": "page:guides:flask:cdn-assets",
      "recipeRevision": "r1"
    }
  }