How to unify different error/fault format?

[#1]

We're trying to unify our error responses into one format. This only makes sense if we can align all error responses, especially those generated by Edge and not catchable by individual proxies.

What steps do we have to take to customize all possible errors?

---

For example, on our on-premise Edge Cloud, if I request a non-existing path I get

{
  "fault": {
    "faultstring": "Classification failed for host: apiproxy-dev-online:9001 url: /foo",
    "detail": {
      "code": "CLASSIFICATION_FAILED"
    }
  }
}

This can be solved by https://community.apigee.com/questions/8072/modify-default-404-response-in-cloud-instance.html - but there surely are more cases to cover.