uniCloud.connectWebSocket 报错

云函数【cus-websocket-fun】

exports.onWebsocketMessage = async function (event) {  
    const { connectionId, payload } = event  
    const ws = uniCloud.webSocketServer()  
    await ws.send(connectionId, `receive:${payload}`)  
}

uniapp【App.onLaunch】

async function websocketCus() {  
    const exampleWebSocket = await uniCloud.connectWebSocket({  
        name: 'cus-websocket-fun',  
        query: {}  
    })  
    exampleWebSocket.onOpen(event => {  
        console.log("WebSocket:open", event)  
    })  
    exampleWebSocket.onMessage(event => {  
        console.log("WebSocket:message", event.data)  
    })  
    exampleWebSocket.onClose(event => {  
        console.log("WebSocket:close", event)  
    })  
    exampleWebSocket.onError(event => {  
        console.log("WebSocket:error", event)  
    })  
}

控制台输出【wx小程序】

WebSocket:open {}  
WebSocket:close {code: 4000, reason: "call function failed"}

执行了