The caching feature does not say that a value created for one request must never be cached #47

What is missing

The caching feature says how a cache key is made from Evidence, but not that some results hold a value created for the one request that asked for it. A 51Did is one. The cloud service creates a new 51Did for every request, so two requests with identical Evidence receive different 51Dids, and a cache that stores the Cloud Request Engine's response hands the 51Did created for one request to the next request with the same Evidence.

The Rust SDK had this defect (51Degrees/51degrees-rust#74, fixed in 51Degrees/51degrees-rust#174), and the .NET pipeline has it when its results cache is on (51Degrees/51degrees-dotnet#8).

What is needed

Say that a cache MUST NOT store, or serve, a result that holds such a value, and how the Cloud Request Engine applies that to a response carrying a fodid member.