code: function(bidRequests) {
      const serverRequests = [];
      for (var i = 0, len = bidRequests.length; i < len; i++) {
        const gaxObjParams = bidRequests[i];
        serverRequests.push({
          method: 'GET',
          url: '//' + ENDPOINT + '/adx/request?wid=' + gaxObjParams.params.siteId + '&zid=' + gaxObjParams.params.zoneId + '&hb=pbjs&bidid=' + gaxObjParams.bidId + '&urf=' + encodeURIComponent(utils.getTopWindowUrl())
        });
      }
      return serverRequests;
    }
docs: Make a server request from the list of BidRequests.
  
  @param {BidRequest[]} bidRequests A non-empty list of bid requests which should be sent to the Server.
  @return ServerRequest Info describing the request to the server.