Here’s twtech breakdown of CloudFront Functions vs. Lambda@Edge
use cases …so everyone can quickly
see where each type fits best.
1. CloudFront Functions –
Best for lightweight, viewer-level logic
Key traits:
- Ultra-low latency (<1 ms)
- Very cheap
- Runs only at viewer request and viewer
response
- JavaScript only, no external calls
Common use cases:
- URL rewrites & redirects (e.g., /blog → /blog/index.html)
- Header manipulation
(add/remove security headers)
- A/B testing routing
(send 10% of traffic to new path)
- Geo-based redirects
(redirect based on CloudFront-Viewer-Country header)
- Device-based content serving (detect mobile/desktop and rewrite request path)
- Simple access control
(block requests by IP or country)
- Static asset versioning (append cache-busting query strings)
When to choose:
Used when twtech logic is short,
synchronous, and doesn’t need AWS service calls.
2. Lambda@Edge –
Best for complex, origin-aware logic
Key traits:
- Full Lambda capabilities
- Runs at viewer and origin events
- Node.js or Python
- Can call AWS APIs or external APIs
- More expensive than CloudFront Functions
Common use cases:
- Authentication & Authorization (JWT, OAuth, Cognito integration)
- Dynamic content generation (HTML, JSON based on request)
- Image transformation/resizing on the fly
- Custom caching strategies (vary cache key by header, query, cookie)
- Personalization
(serve customized pages per user profile)
- SEO-friendly redirects with conditional logic
- API request signing
(add secure headers before origin call)
- Localization
(fetch content from S3/DynamoDB based on user’s language)
When to choose:
Used when twtech needs heavier logic, origin control, with AWS integrations.
3. Quick Decision Table
|
Feature / Need |
CloudFront Functions |
Lambda@Edge |
|
Ultra-low latency. |
✅ |
⚠️ (cold starts possible) |
|
Low cost. |
✅ |
❌ Higher cost |
|
Simple header/URL manipulation. |
✅ |
✅ |
|
Call AWS or external APIs. |
❌ |
✅ |
|
Runs at origin events. |
❌ |
✅ |
|
Dynamic content generation. |
❌ |
✅ |
|
Heavy computation. |
❌ |
✅ |
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