code: function screenshotServiceUrl(siteUrl) {
      return url.format({
          protocol: 'http',
          hostname: DEF_MANET_HOST,
          port: DEF_MANET_PORT,
          query: {
              callback: DEF_CALLBACK,
              url: siteUrl,
              force: true
          }
      });
  }
docs: Generate full URL to the screenshot service.