code: function buildRtbRequest(imps, auctionId) {
    let req = {
      'id': auctionId,
      'imp': imps,
      'site': createSite(),
      'at': 1,
      'device': {
        'ip': 'caller',
        'ua': 'caller',
        'js': 1,
        'language': getLanguage()
      },
      'ext': {
        'adk_usersync': 1
      }
    };
    if (utils.getDNT()) {
      req.device.dnt = 1;
    }
    return req;
  }
docs: Builds complete rtb request
  @param imps collection of impressions
  @param auctionId