code: public IpcLogEntry withClientZone(String zone) {
      this.clientZone = zone;
      if (clientRegion == null) {
        clientRegion = extractRegionFromZone(zone);
      }
      return this;
    }
docs: Set the client zone for the request. In the case of the server side this will be
  automatically filled in if the {@link NetflixHeader#Zone} is specified on the client
  request.