无法连接到iOS中的websocket

在上有一个Traccar服务器，尝试使用Swift library红蜘蛛（）连接websocket。 这是我的代码：

func connect(_ token: String) {

    var urlString = "\(self.serverURL)api/socket"
    urlString = urlString.replacingOccurrences(of: "http", with: "ws")

    self.socket = WebSocket(url: URL(string: urlString)!, protocols: ["chat"])

    guard let socket = self.socket else { return }

    socket.headers["Cookie"] = "JSESSIONID=\(token)"
    socket.headers["Sec-WebSocket-Key"] = "\(token)"
    socket.headers["Sec-WebSocket-Protocol"] = "chat"
    socket.headers["Sec-WebSocket-Version"] = "13"
    socket.headers["Host"] = self.serverURL
    socket.headers["Upgrade"] = "websocket"
    socket.headers["Connection"] = "Upgrade"
    socket.headers["Origin"] = self.serverURL
    socket.headers["Sec-WebSocket-Accept"] = "application/json, text/html"

    socket.delegate = self
    socket.connect()


    print("isConnected: \(socket.isConnected)")
    print("socket: \(socket)")
    print("headers: \(socket.headers)")
}

未发生任何事件，websocket的状态为正在连接，从未打开。 调用套接字时，使用Fiddler也看不到任何GET请求。连接。。。 它在iOS模拟器中工作吗