openapi: 3.0.3
info:
  version: 1.0.0
  title: Example API
paths:
  /hello:
    get:
      operationId: sayHello
      parameters:
        - in: query
          name: name
          schema:
            type: string
          required: true
      responses:
        '200':
          description: Successful response
          content:
            'application/json':
              schema:
                $ref: '#/components/schemas/SayHelloResponseContent'
        '400':
          description: Error response
          content:
            'application/json':
              schema:
                $ref: '#/components/schemas/ApiErrorResponseContent'
components:
  schemas:
    ApiErrorResponseContent:
      type: object
      properties:
        errorMessage:
          type: string
      required:
        - errorMessage
    SayHelloResponseContent:
      type: object
      properties:
        message:
          type: string
      required:
        - message