无法从JavaScript客户端通过https连接到Websocket服务器

Question

I have created websocket server for my webrtc app using the following code

 const https = require('https');
const fs = require('fs');

const options = {
    key: fs.readFileSync('C:/.../key_store.key'),
    cert: fs.readFileSync('C:/.../key_store.crt')
};

var server = https.createServer(options, (req, res) => { res.writeHead(200); res.end('hello world\n');}).listen(9090);



//require our websocket library
var WebSocketServer = require('ws').Server;

//creating a websocket server at port 9090 
var wss = new WebSocketServer({server});

My websocket client code is :

conn = new WebSocket('ws://localhost:9090');

I am getting the following exception in JavaScript console when I am trying to connect to websocket server using the above code:

VM908:35 WebSocket connection to 'ws://localhost:9090/' failed: Connection closed before receiving a handshake response

I tried importing certificates in chrome but with no success.

Answer 1

WebRTC requires https and https pages allow Secure Wecsockets (wss) connections only.

So you need to create WebSocket in the client side as follows

conn = new WebSocket("wss://your_server_ip:wss_port/");
In your case:
conn = new WebSocket("wss://139.126.123.18:9090/");

I think you are using self signed SSL certificates(key_store.crt/.key) in your WebSocket Server.
In that case browsers will raise ERR_INSECURE_RESPONSE exception for those connections.
So we have add exception manually by accessing that url in browser as following.

Open https://139.126.123.18:9090/ in new tab,
Then click on Advanced -> proceed (for Chrome).

Or you can export your self signed CA to browsers.

Now your Secure WebSocket should get connected.

Answer 2

Try to change your code to something like this

const https = require('https');
const fs = require('fs');
const options = {
    key : fs.readFileSync('C:/.../key_store.key'),
    cert : fs.readFileSync('C:/.../key_store.crt')
};
var server = https.createServer(options).listen(9090);
//require our websocket library
var WebSocketServer = require('ws').Server;
//creating a websocket server at port 9090
var wss = new WebSocketServer({server});

// wait for connection to be established
wss.on('connection', (ws, req) => { 

    // send some message
    ws.send('hello world\n');

    // close connection
    ws.close(); 
});