SignalR SSL 连接无法建立

Question

我正在使用 SignalR 在我的 ASP.NET 服务器和 Xamarin.Z6450242531912981C6Z68 客户端之间进行通信。 但是，当我使用 https 时，HubConnection 在尝试时抛出此异常。StartAsync(): System.Net.Http.HttpRequestException: 'The SSL connection could not be established, see inner exception. 但是，当我改用 http 时，一切正常。 请帮我！ 先感谢您！

Answer 1

因此，我通过将 Xamarin.Forms 共享项目 .NETStandard 版本升级到 2.1 并以这种方式重写 HubConnectionBuilder 来解决它：

hubConnection = new HubConnectionBuilder().WithUrl(Properties.Resources.ServerIPAddress + "/test",
                options =>
                {
                    options.WebSocketConfiguration = conf =>
                    {
                        conf.RemoteCertificateValidationCallback = (message, cert, chain, errors) => { return true; };
                    };
                    options.HttpMessageHandlerFactory = factory => new HttpClientHandler
                    {
                        ServerCertificateCustomValidationCallback = (message, cert, chain, errors) => { return true; }
                    };
                    options.AccessTokenProvider = () => Task.FromResult(Token);
                }).Build();

Answer 2

 hubConnection = new HubConnectionBuilder()
     .WithUrl($"your host/chatHub", (opts) =>
     {
         opts.HttpMessageHandlerFactory = (message) =>
         {
             if (message is HttpClientHandler clientHandler)
                 // bypass SSL certificate
                 clientHandler.ServerCertificateCustomValidationCallback +=
                     (sender, certificate, chain, sslPolicyErrors) => { return true; };
             return message;
         };
     }).Build();