let address: ListeningAddress = .ip(host: "localhost", port: 8000)
        WebSocket.server(listen: address, configuration: Configuration(pingInterval: .seconds(10))) { _, websocket in
            print("new client connect")
            websocket.onText { _, text in
                print("recive text from client:", text)
                websocket.send(text)
            }
            websocket.onBinary { _, binary in
                var data = binary
                if let value = data.readBytes(length: data.readableBytes) {
                    print("recive binary from client:", String(bytes: value, encoding: .utf8) ?? "")
                    websocket.send(value)
                }
            }
            _ = websocket.onClose.always { _ in
                print("client close connection")
            }
        }

        let address: ServerAddress = .URL(URL: URL(string: "ws://127.0.0.1:\(8000)")!)
        if let websocket = WebSocket.client(connect: address, configuration: Configuration(pingInterval: .seconds(10))) {
            websocket.onText { _, text in
                print("recive text from server:", text)
            }
            websocket.onBinary { _, binary in
                var data = binary
                if let value = data.readBytes(length: data.readableBytes) {
                    print("recive binary from client:", String(bytes: value, encoding: .utf8) ?? "")
                }
            }

            websocket.send("hello test")
            websocket.send([UInt8]("hello test".utf8))
            try? websocket.onClose.wait()
        }