与 SignalR 的连接出现超时错误

Question

我有我的 SignalR 服务，并尝试将它与一个简单的 .Net Core 应用程序连接起来。当浏览器调用https://imubitsignalr.service.signalr.net:5001/client/negotiate?hub=usercount 我收到 ERR_CONNECTION_TIMED_OUT 的错误。

我错过了什么？

程序：index.cshtml

<script type="text/javascript">
    document.addEventListener('DOMContentLoaded', function () {
        function bindConnectionMessage(connection) {
            var messageCallback = function (message) {
                console.log('message' + message);
                if (!message) return;
                var userCountSpan = document.getElementById('users');
                userCountSpan.innerText = message;
            };
            connection.on("updateCount", messageCallback);
            connection.onclose(onConnectionError);
        }
        function onConnected(connection) {
            console.log('connection started');
        }
        function onConnectionError(error) {
            if (error && error.message) {
                console.error(error.message);
            }
        }
        var connection = new signalR.HubConnectionBuilder().withUrl('/chat').build();
        bindConnectionMessage(connection);
        connection.start()
            .then(function () {
                onConnected(connection);
            })
            .catch(function (error) {
                console.error(error.message);
            });
    });
</script>

在 startup.cs 我设置：

services.AddSignalR(hubOptions => {
    hubOptions.EnableDetailedErrors = true;
    hubOptions.KeepAliveInterval = TimeSpan.FromSeconds(3);
}).AddAzureSignalR();

集线器代码：

   public class UserCount : Hub
    {
        private static int Count;

        public override Task OnConnectedAsync()
        {
            Count++;
            base.OnConnectedAsync();
            this.Clients.All.SendAsync("updateCount", Count);
            return Task.CompletedTask;
        }

        public override Task OnDisconnectedAsync(Exception exception)
        {
            Count--;
            base.OnDisconnectedAsync(exception);
            this.Clients.All.SendAsync("updateCount", Count);
            return Task.CompletedTask;
        }
    }

映射中心：

     app.UseAzureSignalR(routes =>
                    {
                        routes.MapHub<UserCount>("/chat");
                    });

Answer 1

确保您像以下示例一样配置您的 WebApp：

public void Configure(IApplicationBuilder app, HostConfiguration hostConfiguration, ILogger<Startup> logger)
{
    base.Configure(app, hostConfiguration, logger);

    app.UseWebSockets();

    app.UseCors(CorsPolicy);

    app.UseAzureSignalR(routes =>
    {
        routes.MapHub<ChatHub>("/chat");
    });
}

public void ConfigureServices(IServiceCollection services)
{
    services.AddCors(options =>
    {
        options.AddPolicy(CorsPolicy, builder => builder.WithOrigins("https://localhost:4200")
            .AllowAnyHeader()
            .AllowAnyMethod()
            .AllowCredentials()
            .SetIsOriginAllowed((host) => true));
    });
            
    services.AddSignalR().AddAzureSignalR(azureOptions =>
    {
        azureOptions.ConnectionString = "connectionSringHere";
    });
}