public static IHttpClientBuilder AllowSelfSignedCertificate(this IHttpClientBuilder builder) { if (builder == null) { throw new ArgumentNullException(nameof(builder)); } return(builder.ConfigureHttpMessageHandlerBuilder(b => { b.PrimaryHandler = new HttpClientHandler { ServerCertificateCustomValidationCallback = HttpClientHandler.DangerousAcceptAnyServerCertificateValidator }; })); }