info:
  title: Required parameter missing, doesn't block request from executing.
  version: '1'
openapi: 3.0.0
servers: 
- url: http://httpbin.org/anything
paths:
  /foos:
    post:
      requestBody:
        content:
          application/x-www-form-urlencoded:
          # application/json:
          # application/xml:
            schema:
              properties:
                foo:
                  type: string
                bar:
                  type: string
              required:
                - foo
              type: object
        required: true # Note this doesn't have an impact
      responses:
        default:
          description: ok