Asp .Net Core 2 + SignalR（1.0.0-alpha2-27025）+ / signalr / negotiate 404错误

我将SignalR添加到ASP .Net Core 2应用

包装

• “ Microsoft.AspNetCore.All”版本=“ 2.0.0”
• “ Microsoft.AspNetCore.SignalR”版本=“ 1.0.0-alpha2-27025”
• “ Microsoft.AspNetCore.SignalR.Client”版本=“ 1.0.0-alpha2-27025”
• “ Microsoft.AspNetCore.SignalR.Client.Core”版本=“ 1.0.0-alpha2-27025”
• “ Microsoft.AspNetCore.SignalR.Common” Version =“ 1.0.0-alpha2-27025”
• “ Microsoft.AspNetCore.SignalR.Core”版本=“ 1.0.0-alpha2-27025”

public IServiceProvider ConfigureServices(IServiceCollection services)
{
    services.AddSignalRCore();
    services.AddSignalR();
}

和

public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory, IServiceProvider serviceProvider)
    app.UseSignalR(routes =>
    {
        routes.MapHub<ManageHub>("manageHub");
    });
}

url：port / signalr，url：port / signalr / negotiate ...返回404

url：port / manageHub返回“ 400”，带有“需要连接ID”

我找不到.MapSignalR（）

如何在ASP .Net Core中使用SignalR？