The Deprecation HTTP response header field is used to signal to consumers of a resource (in the sense of URI) that the resource will be or has been deprecated. Additionally, the deprecation link relation can be used to link to a resource that provides additional information about planned or existing deprecation, and possibly ways in which clients can best manage deprecation.
You’re complained about “Proper HTTP implementations in proper languages”.
I provided two concrete examples of two of the most popular and production-grade programming language ever developed.
I can provide more.
You then tried to weasel out by moving your goal post from “Proper HTTP implementations in proper languages” to “languages that don’t have proper sum types”.
I won’t waste more of my time with you. Whatever you’re posting lacks relevance and does not justify any attention from anyone.