example.yaml

swagger: '2.0'
info:
  version: 0.0.0
  title: title
  description: description
  termsOfService: terms
  license:
    name: MIT
    url: http://opensource.org/licenses/MIT

paths:
  /test:
    parameters:
      - $ref: '#/parameters/myTimestamp'
    get:
      parameters: []
      responses:
        default:
          description: it works
    put:
      parameters: []
      responses:
        default:
          description: it works
  /test2:
    parameters:
      - $ref: '#/parameters/myTimestamp'
    get:
      parameters: []
      responses:
        default:
          description: it works
    put:
      parameters: []
      responses:
        default:
          description: it works
parameters:
  myTimestamp:
    in: header
    name: timestamp
    type: string