.net core signalR 忽略https 证书

var connection = new HubConnectionBuilder().WithUrl(serverUrl, option =>
             {
                 option.HttpMessageHandlerFactory = (handler) =>
                 {
                     var newHandler = handler as HttpClientHandler;
                     newHandler.ServerCertificateCustomValidationCallback = (request, cert, chain, errors) =>
                     {
                         return true;
                     };
                     return newHandler;
                 };
             }).Build();