我尝试使用SwiftSignalRClient（https://github.com/moozzyk/SignalR-Client-Swift）获取一些数据。我尝试了以下操作：

private let serverUrl = "https://xxxx"
 private var chatHubConnection: HubConnection
 private weak var chatHubConnectionDelegate: HubConnectionDelegate?
 override func viewDidLoad() {
        super.viewDidLoad()
 self.chatHubConnection?.delegate = ChatHubConnectionDelegate(controller: self)
        chatHubConnection = HubConnectionBuilder(url: URL(string: serverUrl)!).withLogging(minLogLevel: .error)
            .withHttpConnectionOptions(configureHttpOptions: { (httpConnectionOptions) in
                        httpConnectionOptions.headers["Authorization"] = "Bearer \(UserDefaults.standard.accessToken)"
            })
            .build()
        self.chatHubConnection?.start()
        chatHubConnection!.on(method: "ChatStart", callback: { (user: String, message: String) in
                   do {
                      print(user)
                   } catch {
                       print(error)
                   }
               })
               
        chatHubConnection!.start()
        chatHubConnection?.invoke(method: "ChatStart", ["AcceptBid": xxxx], invocationDidComplete: { (error) in
            print(error)
            
        })

在第一个函数中，它甚至不打印用户，也不打印错误，而在第二个函数中，在错误打印时，我得到以下错误：SwiftSignalRClient.SignalRError.invalidOperation(message: "Attempting to send data before connection has been started.

更新：我调用了委托函数connectionDidOpen，我收到以下错误：无可用的支持传输