Vercel CDN no longer caches responses with Vary: Cookie
Update3 days agoUnverifiedAdded Oct 2, 2026
Vercel CDN no longer caches origin responses when Vary includes Cookie . Vary tells a cache which request headers may change the response. Because cookies often contain visitor-specific values, varying by Cookie can create many cache entries that are rarely reused. The response is still served normally but isn't stored for future requests.
Topics: Observability
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Also shipped on Sep 30, 2026
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