Problem:
  type: object
  properties:
    type:
      type: string
      format: uri
      description: |
        An absolute URI that identifies the problem type.  When dereferenced,
        it SHOULD provide human-readable documentation for the problem type
        (e.g., using HTML).
      default: 'about:blank'
      example: 'https://zalando.github.io/problem/constraint-violation'
    title:
      type: string
      description: |
        A short, summary of the problem type. Written in english and readable
        for engineers (usually not suited for non technical stakeholders and
        not localized); example: Service Unavailable
    status:
      type: integer
      format: int32
      description: |
        The HTTP status code generated by the origin server for this occurrence
        of the problem.
      minimum: 100
      maximum: 600
      exclusiveMaximum: true
      example: 503
    detail:
      type: string
      description: |
        A human readable explanation specific to this occurrence of the
        problem.
      example: Connection to database timed out
    instance:
      type: string
      format: uri
      description: |
        An absolute URI that identifies the specific occurrence of the problem.
        It may or may not yield further information if dereferenced.