swagger: '2.0'
info:
  version: 1.0.0
  title: 'string-body-api'
paths:
  /echo:
    post:
      operationId: "postEcho"
      summary: Post an object
      parameters:
        - name: body
          in: body
          description: this argument is a string
          schema:
            type: object
            additionalProperties:
              type: integer
              format: int64
      responses:
        '200':
          description: All is good