Observed Signal · Aug 17, 2026 · Technical Release · Source: DEV Community · Impact: 2/5 · Sentiment: Neutral
CloudFront Functions: Dynamic Origin Switching
This technical how-to demonstrates using AWS CloudFront Functions together with a CloudFront KeyValueStore to switch between different S3-backed origins behind the same URL without redeploying. The author implements a CloudFront Function that reads an 'app-version' key from a KeyValueStore to select the origin, and documents caching pitfalls: CloudFront caches by path regardless of origin, so cache invalidation or cache partitioning via a custom header (e.g., X-App-Version) is required. The article includes CloudFormation snippets, a bash script to update the KeyValueStore and trigger invalidations via the AWS CLI, and a recommended fix of forwarding a custom header to create separate cache entries per origin.
Practical technical guide for AWS CloudFront origin selection and cache management; useful for CDN and edge configuration but not industry-shifting.
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Key Takeaways & Evidence Grounding
- The article shows switching between two S3-hosted web apps (AppOne and AppTwo) under the same CloudFront URL using a CloudFront Function to select the origin.
- CloudFront Functions run on every request while Lambda@Edge is invoked on cache misses; CloudFront Functions are JavaScript-only and do not access third-party services.
- CloudFront caching is path-based and does not consider which origin served the content, so cache invalidation or cache partitioning via custom headers is necessary to ensure correct app versions are returned.
- The author provides a script (AWS CLI) that updates the CloudFront KeyValueStore 'app-version' key and creates a distribution invalidation; the final solution sets an X-App-Version header and forwards it to create separate cache entries.
Connected Companies & Entities
2 Entities mapped“When working with requests and responses in CloudFront, there are two main candidates: CloudFront Functions and [Lambda@Edge](mailto:Lambda@...”
“Code is available [in this repository](https://github.com/szymon-szym/cf-origin-switch)...”
Ontology Mapping & Concepts
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