Cloud CDN now supports custom named cookies and headers in the cache key, to enable A/B (multivariate) testing, canarying, and similar scenarios
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## Feature
Cloud CDN now supports custom named cookies and headers in the cache key, to enable A/B (multivariate) testing, canarying, and similar scenarios. Allowlisting of query parameters is now also enabled for backend buckets, to allow for cache busting. These features are available in **Preview**.
For details, see the [caching documentation](https://cloud.google.com/cdn/docs/caching#cache-keys).