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cloud.google.com·8h ago
Security
Cloudflare Blog·20d ago·5 min read
We just shipped support for the ugliest part of HTTP: Vary
TL;DR
Cloudflare has introduced support for the Vary HTTP header in its Cache Rules, allowing for better handling of varied responses based on request headers. This enhancement enables more efficient caching while reducing the risk of serving incorrect content.
✦ Why It Matters
Implement Cloudflare's Vary support to optimize your caching strategy and ensure accurate content delivery.
Key Takeaways
- Use Vary to manage cached responses based on request headers.
- Normalize headers to improve cache hit rates.
- Implement passthrough for headers that require exact matching.
- Bypass cache for high-cardinality or unpredictable headers.
How It Works
Cloudflare's Cache Rules allow users to specify how Vary headers are handled, enabling normalization of request headers to group similar requests together. This reduces the number of cache entries and improves efficiency by ensuring that equivalent requests share cached responses.