protected WebStore(
     int apiVersion,
     BaseUris baseUris,
     string userAgent)
 {
     _apiVersion = apiVersion;
     _baseUris   = baseUris;
     _userAgent  = userAgent;
 }
 protected WebStoreV2(BaseUris baseUris, string userAgent)
     : base(2, baseUris, userAgent)
 {
 }