Cache Key
A cache key is the unique identifier a cache uses to store and look up a response. It is typically built from the request URL and may include query parameters, selected headers, or user attributes. Two requests with the same cache key receive the same cached response.
Technical Architecture & Deep-Dive
Designing cache keys is a balance. Keys that are too broad risk serving one user data to another, while keys that are too specific fragment the cache and lower hit ratios.
For public API data like product catalogs or weather, a key based on the normalized URL works well. For per-user data, the key must include a user or tenant identifier, or the response should not be shared at all. Edge platforms allow custom cache keys so gateways can ignore irrelevant query parameters and include only meaningful variation.
Key Architectural Benefits
Implement Cache Key at the Edge
Deploy lightweight API aggregation, edge caching, and secret injection in minutes without Docker containers or complex servers.
Frequently Asked Questions
Q:Should authorization headers be part of a cache key?
If responses vary by user, yes, or better, do not cache them in shared caches. Public responses should exclude auth headers from the key to maximize reuse.
Related Architecture Concepts
Edge Caching is the practice of storing computed API responses on globally distributed Point of Presence (PoP) servers situated geographically close to users. By serving cached responses directly from edge memory, requests achieve sub-10ms latencies while offloading 95%+ of traffic from origin databases.
Cache hit ratio is the percentage of requests served directly from a cache rather than forwarded to the origin. It is calculated as cache hits divided by total requests. A higher ratio means lower latency, less origin load, and fewer billable third-party API calls.
Cache invalidation is the process of removing or marking cached data as stale so subsequent requests fetch fresh content from the origin. Strategies include time-based expiry with TTLs, explicit purges by URL or tag, and event-driven invalidation triggered by data changes.
Cache-Control is an HTTP response header that tells browsers, CDNs, and proxies whether and how long a response may be cached. Directives such as max-age, s-maxage, private, no-store, and stale-while-revalidate control freshness and sharing for every cached copy.
Ready-to-Use Edge Recipes
To solve cache dynamic rest api without spinning up redis, never execute unauthenticated requests or embed private tokens directly in client bundles. RealComposer acts as a sub-10ms edge gateway running on Cloudflare Workers that securely injects credentials from your Secret Vault, normalizes responses, and prevents unauthorized API usage. Route calls through your RealComposer edge URL to guarantee complete privacy, robust origin validation, and low mobile latency.
To solve cache google places autocomplete api to reduce bills, never execute unauthenticated requests or embed private tokens directly in client bundles. RealComposer acts as a sub-10ms edge gateway running on Cloudflare Workers that securely injects credentials from your Secret Vault, normalizes responses, and prevents unauthorized API usage. Route calls through your RealComposer edge URL to guarantee complete privacy, robust origin validation, and low mobile latency.