Example of http-problem in JSON-LD

gistfile1.jsonld

{
  "@context": ["https://ietf.org/contexts/http-problem/v1", "https://example.com/contexts/my-extension/v1"],
  "type": ["HttpProblem", "OutOfCredit"],
  "title": "You do not have enough credit.",
  "detail": "Your current balance is 30, but that costs 50.",
  "instance": "http://example.net/account/12345/msgs/abc",
  "balance": 30,
  "accounts": ["http://example.net/account/12345", "http://example.net/account/67890"]
}