Parts of the old Web Services stack. It is obvious why SOAP died (to me at least). It was a solution in search of a problem that was already solved by REST/HT

Parts of the old Web Services stack. It is obvious why SOAP died (to me at least). It was a solution in search of a problem that was already solved by REST/HTTP with generic payloads. BUT.... things like WSDL that gave you an interface description... it would be nice if something like that had survived. The closest thing to this that I know of is Swagger. But not having a standard machine-readable way to integrate with REST APIs/services is a missing piece of the puzzle I think. The Web Services Description Language provided that. I'm surprised that or an equivalent never got traction.