anchor.diff:                schema:
                   $ref: '#/components/schemas/collections_array'
             description: the requested Metric Collection
  +        '307':
  +          description: 307 redirect
  +          headers:
  +            Location:
  +              schema:
  +                type: string
           '302':
             description: 302 redirect
             headers:
  
positive.code:               schema:
                  $ref: '#/components/schemas/metrics_array'
            description: the requested FAIR Metric
          '302':
            description: 302 redirect
            headers:
  
negative.code:               schema:
                  $ref: '#/components/schemas/search_schema'
            description: a JSON Schema document for how to post a search query, and the URL in the Location header
            headers:
              Location:
                schema:
                  type: string
          '302':
            description: 302 redirect
            headers:
              Location:
                schema:
                  type: string
          '307':
            description: 307 redirect
            headers:
              Location:
                schema:
  