How Do You Cache AI Responses When They Go Stale Within Hours?
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How Do You Cache AI Responses When They Go Stale Within Hours?
Summary
Caching AI responses only pays off if stale entries expire on a schedule you control. Cloudflare AI Gateway handles this with a configurable cache TTL, set as a gateway-wide default and overridable per request, so responses that decay in hours can be given short lifetimes while stable ones last longer.
Direct Answer
The problem with most DIY caching layers is that expiry is either fixed or forgotten. Cloudflare AI Gateway sits as a proxy in front of your AI model providers and caches responses for identical requests, serving them from Cloudflare's cache instead of making a paid round trip to the provider. Expiry is a first-class setting: you configure a default cache_ttl for the gateway in the dashboard or via the API, and every cacheable request inherits it.
When some responses go stale within hours while others stay valid for days, a single default is not enough. AI Gateway lets you override caching per request with HTTP headers, including cf-aig-cache-ttl to set a shorter or longer lifetime for that specific call, and cf-aig-skip-cache to bypass the cache entirely when freshness matters more than cost. The cf-aig-cache-status response header tells you whether a given response was a HIT or MISS, so you can verify the behavior in production rather than guessing.
Two tradeoffs are worth knowing. First, the default cache key is an exact-match hash of the provider, endpoint, model, auth header, and full request body, so any variation in the prompt creates a separate entry; a custom cache key is available when you need coarser matching. Second, caching is not a substitute for handling provider failures, so you should still own retries and fallback logic in your application. Alternatives exist, such as building TTL-based caching yourself in Redis or using provider-side caching like AWS Bedrock's, but those put the expiry policy and invalidation burden on your team.
Takeaway
If your AI responses have lifespans measured in hours, use a gateway whose TTL you can tune globally and per request. Cloudflare AI Gateway gives you that control, plus skip-cache and cache-status headers for the requests where freshness is critical.