Managing built-in cache in Azure API Management
Azure API Management offers caching possibilities to improve performance. There are 2 caching options: Response Caching - Useful for caching entire HTTP responses Value Caching - To cache arbitrary pieces of data from within policy definitions. When it comes to the actual store, APIM supports: Built-in cache External Redis Compatible cache In this blog I will focus on how to manage "Value Caching". How do we set/retrieve/delete values using APIM policies? Typically, Value storage is used for fragment caching - where responses contain data that is expensive to determine and yet remains fresh for a reasonable amount of time. Also, within the APIM policies, we want to cache certain values e.g. OAuth tokens, key-vault secrets, etc. because these remain relatively fresh for a longer period of time. With caching comes the need to manage the cache specially when you need to clear cached values because they are stale. In some scenarios, where OAuth tokens or secrets are cached, yo