We have used the https://jsonapi.org/schema#/definitions/failure as our API swagger schema ref.

But it looks like recently, https://jsonapi.org/schema has been removed? It return 404 error now?

Questions:

1. Should we use the https://jsonapi.org/schema as the schema content ref? any replacement?
2. What was the content inside https://jsonapi.org/schema before?
3. What's the best practice?