public static void Register(IServiceCollection services, ApiClientsOptions options)
        {
            foreach (var desc in options.List)
            {
                var normUrl = desc.Value.Url == null || desc.Value.Url.EndsWith("/")
                    ? desc.Value.Url
                    : desc.Value.Url + "/";

                services.AddHttpClient(desc.Key, client =>
                {
                    client.BaseAddress = new Uri(normUrl);
                });
            }
        }
        /// <summary>
        /// Integrates ApiClient factoring
        /// </summary>
        public static IServiceCollection AddApiClients(
            this IServiceCollection services,
            Action <IApiContractRegistrar> contractRegistration,
            ApiClientsOptions options)
        {
            if (services == null)
            {
                throw new ArgumentNullException(nameof(services));
            }
            if (options == null)
            {
                throw new ArgumentNullException(nameof(options));
            }

            HttpClientRegistrar.Register(services, options);

            if (contractRegistration != null)
            {
                var contractRegistrar = new DefaultApiContractRegistrar(services);
                contractRegistration(contractRegistrar);
            }

            return(services);
        }