与服务器协商失败- Angular + SignalR

public void ConfigureServices(IServiceCollection services)
{
    services.AddCors(options =>
    {
        options.AddPolicy("AllowAngularApp", builder =>
        {
            builder.WithOrigins("http://localhost:4200") // 替换为您的Angular应用的地址
                   .AllowAnyHeader()
                   .AllowAnyMethod();
        });
    });

    services.AddSignalR();
}

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

    app.UseRouting();

    app.UseEndpoints(endpoints =>
    {
        endpoints.MapHub<YourHub>("/yourSignalRHub");
    });
}

import { HubConnectionBuilder, LogLevel } from '@microsoft/signalr';

const connection = new HubConnectionBuilder()
    .withUrl('http://yourserver.com/yourSignalRHub', {
        skipNegotiation: true,
        transport: HttpTransportType.WebSockets
    })
    .configureLogging(LogLevel.Information)
    .build();

connection.start().then(() => {
    console.log('Connection started');
}).catch(err => console.error(err));