OAS 3.0 - YAML response

yaml-response.oas3.yml

openapi: 3.0.3
info:
  title: YAML response
  version: 1.0.0
  
paths:
  /foo:
    get:
      responses:
        default:
          description: Example YAML response
          content:
            application/yaml:
              schema:
                type: object
                properties:
                  one:
                    type: string
                    example: Uno
                  two:
                    type: string
                    example: Dos