code: function Composer () {
    this.p = {
      product: 'Unknown',
      productVersion: 'Unknown',
      os: os.type(),
      osVersion: os.release(),
      platform: '',
      exts: []
    }
  }
docs: User-Agent: <product> / <product-version> <comment>
  Common format for web browsers:
  User-Agent: Mozilla/<version> (<system-information>) <platform> (<platform-details>) <extensions>