我有一个。运行SignalR Core集线器的Net Core 2.0 C#Web Api。我甚至无法从角度（5.0.1）启动（）我的hubConnection收到此错误：

选项https://localhost:44301/hubs/sample405（方法不允许）

错误：启动连接失败。错误：方法不允许

建立连接时出错：（

XHR加载失败：选项"https://localhost:44301/hubs/sample"。

HttpError：方法不允许在XMLHttpRequest. xhr.onload[as__zone_symbol__ON_PROPERTYload]（webpack-内部：//…/…/…/…/@aspnet/signalr-client/dist/src/HttpClient.js：30:28）在XMLHttpRequest.wrapFn（webpack-内部：//…./…/…/zone.js/dist/zone.js：1166:39）在ZoneReentate.调用Task（webpack-内部：//…/…/./zone.js/dist/zone.js：425:31）在Object.onInvokeTask（webpack-内部：//…/…/…/core/esm5/core.js：4816:33）在ZoneReentate.调用Task（webpack-内部：//…/./…/./zone.js/dist/zone.js：425:31）/…/zone. js/dist/zone.js：499:34）在调用Task（webpack-内部：//…/…/…/…/zone.js/dist/zone.js：1540:14）在XMLHttpRequest.globalZoneAware回调（webpack-内部：//…./…/…/zone.js/dist/zone.js：1566:17）

我甚至在努力调试这个问题，即使在fiddler的帮助下，我也无法解决它。这似乎不是我的Api的问题，因为Kestrel控制台会打印对集线器的请求，但不会打印任何错误。我能够无问题地获取、放置和发布到我的控制器。

这是我的StartUp. cs配置（为了简洁起见，我省略了不相关的代码）

public void ConfigureServices(IServiceCollection services)
{
    services.AddCors(options =>
    {
        options.AddPolicy(
            "CorsPolicy",
            builder =>
                builder
                .AllowAnyOrigin()
                .AllowAnyHeader()
                .AllowAnyMethod()
                .AllowCredentials()
        );
    });

    services.AddAuthentication();
    services.AddMvcCore()
        .AddAuthorization(options => {...});
    services.AddAuthentication("Bearer")
        .AddIdentityServerAuthentication(options => {...});

    services.AddSignalR();
}

public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
    app.UseCors("CorsPolicy");
    app.UseAuthentication();

    app.UseSignalR(routes =>
    {
        routes.MapHub<SampleHub>("/hubs/sample");
    });

    app.UseMvc();
}

这是我的样品集线器

public interface ISampleHubClient 
{
    Task receiveMessage(SampleRequest msg);
}

public class SampleHub : Hub<ISampleHubClient>
{
    private static string _connectionId;

    public async Task Subscribe(string groupName)
    {
        await Groups.AddAsync(Context.ConnectionId, groupName);

        await Clients.Client(Context.ConnectionId).receiveMessage("Subscribed to " + groupName);
    }

    /// <inheritdoc />
    public Task Send(SampleRequest msg)
    {
        ConsoleColor.Green.WriteLine("Send : " + _connectionId);

        return Clients.Group(msg.Group).receiveMessage(msg);
    }
}

这是我的Angular组件代码：

import { HubConnection } from '@aspnet/signalr-client';

@Component({})
export class SignalRTestComponent implements OnInit {
    private hubConnection: HubConnection;

    ngOnInit() {
        this.initHub();
    }

    initHub()
    {
        let self = this;
        var signalrBaseUri = "https://localhost:44301/hubs/sample";

       this.hubConnection = new HubConnection(signalrBaseUri);

        this.hubConnection
        .start() // <- Failure here
        .then(() =>{
             self.hubConnection.invoke("Subscribe", this.groupName);
        })
        .catch(err => { console.log("INVOKE FAILED");console.error(err);});             
    })
    .catch(err => 
    {
        console.log('Error while establishing connection :(');
        console.log(err);
    });

    this.hubConnection.on('receiveMessage', (receivedMessage: SampleMessage) => {
        console.log("Message received : ");
        console.log(sampleMessage);
    });
}
}

任何帮助都将不胜感激