3.0.0 Petstore with path and operation level `servers`

gistfile1.txt

openapi: "3.0.0"
info:
  version: 1.0.0
  title: Swagger Petstore
  license:
    name: MIT
servers:
  - url: http://petstore.swagger.io/v1
  - url: http://petstore.swagger.io/v1/{myNum}/{myEnum}
    variables:
      myNum:
        default: "1"
        description: A number that accepts any value
      myEnum:
        default: "1"
        enum: ["1", "2", "3"]
        description: An enum number
paths:
  /pets:
    servers:
    - url: http://path-level-server.swagger.io/v2
    - url: http://path-level-server-2.swagger.io/v2/{myNum}/{myEnum}
      variables:
        myNum:
          default: "1"
          description: A number that accepts any value
        myEnum:
          default: "1"
          enum: ["1", "2", "3"]
          description: An enum number
    get:
      servers:
      - url: http://operation-level-server.swagger.io/v3
      - url: http://operation-level-server.swagger.io/v3/{myNum}/{myEnum}
        description: An operation-level server definition
        variables:
          myNum:
            default: "1"
            description: A number that accepts any value
          myEnum:
            default: "1"
            enum: ["1", "2", "3"]
            description: An enum number
      summary: List all pets
      operationId: listPets
      tags:
        - pets
      parameters:
        - name: limit
          in: query
          description: How many items to return at one time (max 100)
          required: false
          schema:
            type: integer
            format: int32
      responses:
        '200':
          description: An paged array of pets
          headers:
            x-next:
              description: A link to the next page of responses
              schema:
                type: string
          content:
            application/json:    
              schema:
                $ref: "#/components/schemas/Pets"
        default:
          description: unexpected error
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/Error"
    post:
      summary: Create a pet
      operationId: createPets
      tags:
        - pets
      responses:
        '201':
          description: Null response
        default:
          description: unexpected error
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/Error"
  /pets/{petId}:
    get:
      summary: Info for a specific pet
      operationId: showPetById
      tags:
        - pets
      parameters:
        - name: petId
          in: path
          required: true
          description: The id of the pet to retrieve
          schema:
            type: string
      responses:
        '200':
          description: Expected response to a valid request
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/Pets"
        default:
          description: unexpected error
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/Error"
components:
  schemas:
    Pet:
      required:
        - id
        - name
      properties:
        id:
          type: integer
          format: int64
        name:
          type: string
        tag:
          type: string
    Pets:
      type: array
      items:
        $ref: "#/components/schemas/Pet"
    Error:
      required:
        - code
        - message
      properties:
        code:
          type: integer
          format: int32
        message:
          type: string