Create Cache in APIs With Azure API Policy
The "Cache-Lookup" policy in Azure API Management is a caching policy that is used to search the cache for a stored response based on a configured cache key. The primary purpose of this policy is to check if a cached response exists for the incoming request, and if so, return that cached response without forwarding the request to the backend service. This helps improve performance by reducing the load on backend servers and decreasing response times for frequently requested content.
Key aspects of the "Cache-Lookup" policy include:
1. *Cache Key:*
The cache key is a unique identifier associated with a specific request. It is used to look up and retrieve a corresponding cached response. The cache key can be defined based on various request parameters, headers, or any other relevant information.
2. *Cache Hit:*
If a cached response is found based on the provided cache key, the policy results in a cache hit. In this case, the cached response is returned to the client without making a request to the backend service. This helps in serving responses quickly and efficiently.
3. *Cache Miss:*
If no cached response is found for the given cache key, the policy results in a cache miss. In this scenario, the request proceeds to the backend service to generate a fresh response, which is then stored in the cache for potential future use.
4. *Expiration and Duration:*
Cached responses may have an expiration time or duration, after which they are considered stale. The cache-lookup policy considers these factors and retrieves a fresh response from the backend if the cached content is expired.
By leveraging the "Cache-Lookup" policy, users can implement caching strategies to optimize API performance, reduce latency, and enhance overall system efficiency by avoiding redundant calls to backend services for identical requests.