问题描述
当我尝试在localhost服务器上运行我的node.js应用程序时，它不会运行并要求进行必要的升级。我试图运行代码但是我收到以下错误：
When I try to run my node.js application on a localhost server, it does not run and demands a required upgrade. I have tried to run the code but I get the following error:
服务器代码
var WebSocketServer = require('ws').Server,
ws = new WebSocketServer({port: 80}),
CLIENTS=[];
**new connection etablished**
ws.on('connection', function(conn) {
CLIENTS.push(conn);
conn.on('message', function(message) {
console.log('received: %s', message);
sendAll(message);
});
console.log("new connection");
conn.send("NOUVEAU CLIENT CONNECTE");
**if you close connection**
conn.on('close', function() {
console.log("connection closed");
CLIENTS.splice(CLIENTS.indexOf(conn), 1);
});
});
**send messeages vers all clients**
function sendAll (message) {
for (var i=0; i<CLIENTS.length; i++) {
var j=i+1;
CLIENTS[i].send("Message pour le client "+j+": "+message);
}
}
客户代码
<p>
Result :<output name="" type="text" id="result" value"readonly"></output>
</p>
<input type="text" onchange="ws.send(this.value);">
</body>
<script>
var ws =new WebSocket('ws://localhost:80');
ws.onmessage=function(event){
document.getElementById("result").value=event.data;
}
</script>
推荐答案
需要升级是对在客户端（即浏览器）和服务器之间建立WebSocket连接时发送的标头的引用。
Upgrade Required is a reference to the header that is sent when establishing a WebSocket connection between a client (i.e. the browser) and the server.
像@Prinzhorn所述他的评论，你需要一个连接到你的WebSockets服务器的客户端应用程序，它可以是一个静态的html页面。我建议您阅读的介绍，以更好地了解WebSockets的工作原理。
Like @Prinzhorn stated in his comment, you need a client application that connects to your WebSockets server, which could be a static html page. I recommend you reading this introduction to websockets to understand better how WebSockets work.
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