跨域SignalR

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

    // 其他配置...
}

public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
    // 其他配置...

    app.UseCors("AllowAll");

    app.UseEndpoints(endpoints =>
    {
        endpoints.MapHub<YourHubClass>("/yourHubPath");
    });
}

const connection = new signalR.HubConnectionBuilder()
    .withUrl("http://your-server-url/yourHubPath")
    .build();

// 其他SignalR客户端代码...