如何在asp.net mvc中使用跨域调用对signalR进行身份验证？

<system.webServer>
  <httpProtocol>
    <customHeaders>
      <add name="Access-Control-Allow-Origin" value="*" />
      <add name="Access-Control-Allow-Headers" value="Content-Type" />
      <add name="Access-Control-Allow-Methods" value="GET, POST, OPTIONS, PUT, DELETE" />
    </customHeaders>
  </httpProtocol>
</system.webServer>

[Authorize] // 添加身份验证特性
public class MyHub : Hub
{
    public void SendMessage(string message)
    {
        // 处理消息
    }
}

var connection = new signalR.HubConnectionBuilder()
    .withUrl("http://example.com/myhub")
    .build();

connection.start().then(function () {
    // 身份验证成功后的操作
}).catch(function (error) {
    // 处理连接错误
});

connection.invoke("SendMessage", message).catch(function (error) {
    // 处理调用错误
});