.net core webapi Startup 注入ConfigurePrimaryHttpMessageHandler

asp.net core IHttpClientFactroy 进行SSL(https)请求时注入ConfigurePrimaryHttpMessageHandler解决https请求错误：

static public class CreditScoreServiceExtension{static public void AddCreditScoreQueryServiceHttpClient(this IServiceCollection services, IConfiguration config){services.AddSingleton<ICreditScoreQueryService, CreditScoreQueryService>();//var serviceUrl = config.GetSection("AppSettings").GetSection("FC").GetSection("CreditScore")["ServiceUrl"];//var baseUri = new Uri(serviceUrl);services.AddHttpClient<ICreditScoreQueryService, CreditScoreQueryService>(client => { }).ConfigurePrimaryHttpMessageHandler(() =>{var handler = new HttpClientHandler();//if (baseUri.Scheme.ToLower() == "https")//{//    handler.ServerCertificateCustomValidationCallback = (sender, cert, chain, sslPolicyErrors) => { return true; };//}handler.ServerCertificateCustomValidationCallback = (sender, cert, chain, sslPolicyErrors) => true;return handler;}).SetHandlerLifetime(TimeSpan.FromMinutes(5));}
}