swagger-ui/test/e2e-cypress/static/documents/features/response-extension.openapi.yaml

openapi: "3.0.0"

paths:
  /:
    get:
      operationId: "myOperation"
      tags: ["myTag"]
      summary: an operation
      responses:
        '200':
          description: a pet to be returned
          content:
            application/json:
              schema:
                type: object
        '404':
          x-error: true
          x-error-codes: [NOT_FOUND]
          description: Not found