我用 Node 构建了一个 websocket 服务器和客户端，两者都运行良好。但是，我在单个 html 页面上构建了一个客户端，当我从浏览器调用 sendUTF 时，websocket 正在监听消息。浏览器客户端无法读取 Node 客户端发送的消息。这是安全问题/功能还是我愚蠢？
服务器代码:
var WebSocketServer = require('websocket').server;
var http = require('http');
var server = http.createServer( (req, res) => {
console.log((new Date()) + ' Received request for ' + request.url);
res.writeHead(404);
res.end();
});
server.listen(8080, () => {
console.log((new Date()) + ' Server is listening on port 8080');
});
wsServer = new WebSocketServer({
httpServer: server,
// You should not use autoAcceptConnections for production
// applications, as it defeats all standard cross-origin protection
// facilities built into the protocol and the browser. You should
// *always* verify the connection's origin and decide whether or not
// to accept it.
autoAcceptConnections: false
});
function originIsAllowed(origin) {
// put logic here to detect whether the specified origin is allowed.
return true;
}
wsServer.on('request', (request) => {
/* if (!originIsAllowed(request.origin)) {
// Make sure we only accept requests from an allowed origin
request.reject();
console.log((new Date()) + ' Connection from origin ' + request.origin + ' rejected.');
return;
}*/
var connection = {};
try {
connection = request.accept('echo-protocol', request.origin);
console.log((new Date()) + ' Connection accepted.');
connection.on('message', function(message) {
if (message.type === 'utf8') {
console.log('Received and send Message: ' + message.utf8Data);
connection.sendUTF(message.utf8Data);
}
else if (message.type === 'binary') {
console.log('Received Binary Message of ' + message.binaryData.length + ' bytes');
connection.sendBytes(message.binaryData);
}
else {
console.log('Received unknown format message: ' + message);
connection.send(message);
}
});
connection.on('close', function(reasonCode, description) {
console.log((new Date()) + ' Peer ' + connection.remoteAddress + ' disconnected.');
});
}
catch(e) {
console.error("Client fail trying to connect to websocket: " + e);
}
});
Node 客户端代码:
var express = require('express');
var app = express();
server = require('http').createServer(app);
var WebSocketClient = require('websocket').client;
var kinect = new Kinect2();
app.use(express.static(__dirname + 'js/View'));
//app.use(express.static(__dirname + 'js/Script'));
//instance of WebSocket object
var wsClient = new WebSocketClient();
//Websocket connection events
wsClient.on('connectFailed', function(error) {
console.log('Connect Error: ' + error.toString());
process.exit(0);
});
wsClient.on('connect',(connection) => {
connection.on('error', (error) => {
console.error("Connection Error: " + error.toString());
process.exit(0);
});
connection.on('close',() => {
console.log("Websocket connection is closed!");
});
// connection.on('message',(message) => {
// if (message.type === 'utf8') {
// console.log("Received: '" + message.utf8Data + "'");
// }
// });
console.log('Websocket connection OK!');
setInterval(() => {
console.log("sending message...");
connection.send("This is a test!");
},1000);
//startKinect(connection);
});
wsClient.connect('ws://127.0.0.1:8080','echo-protocol');
最后是我的浏览器客户端
<!DOCTYPE html>
<html>
<head>
<title>
Websocket test
</title>
</head>
<body>
<h1>Websocket client test</h1>
<script>
console.log("Open Websocket...");
var websocket = new WebSocket('ws://127.0.0.1:8080','echo-protocol');
websocket.onopen = function () {
console.log("websocket was open");
//websocket.send('Websocket is working(I gess)');
};
websocket.onclose = () => {
console.log("Websocket was closed!");
}
websocket.onerror = (error) =>{
console.error("Websocket error: " + JSON.stringify(error));
};
websocket.onmessage = (message) => {
// Web Socket message:
console.log("MSG: " + message.data );
};
websocket.addEventListener('message',(e) => {
websocket.onmessage(e);
})
</script>
</body>
</html>
欢迎任何帮助!谢谢!
最佳答案
您的服务器正在以回显方式工作(客户端 -> 服务器 -> 客户端)，但您描述的是广播(客户端 -> 服务器 -> 客户端s)。您应该保留客户的引用资料，然后发送给所有客户。
在 request 事件处理程序之外，添加:
var connections = [];
接受请求后，将连接添加到数组:
connections.push( connection );
然后当你想向每个人发送数据时，通过连接循环:
for ( var i = 0; i < connections.length; i++ )
connections[ i ].sendUTF( message.utf8Data );
关于javascript - Websocket - 浏览器 websocket 没有从服务器接收消息，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/45695184/