added final questions

added ssl certificate and switched from http & ws to https &wss
files to exchange for you are server/cert.pm for the certificate and server/key.pem for the key of the Hochschul certifiacte

.vscode/launch.json

             "type": "chrome",
             "request": "launch",
             "name": "Launch Chrome",
-            "url": "http://localhost:8000",
+            "url": "https://localhost:8000",
             "webRoot": "${workspaceFolder}/client"
         },
 

client/ws-client.js

 // #endregion
 
 // websocket to communicate with the server
-var ws = new WebSocket('ws://' + window.location.host + window.location.pathname + 'ws');
+var ws = new WebSocket('wss://' + window.location.host + window.location.pathname + 'ws');
 
 // #region speech recognition initialization
 var recognition = new SpeechRecognition();

server/cert.pem

+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----

server/key.pem

+-----BEGIN RSA PRIVATE KEY-----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+-----END RSA PRIVATE KEY-----

server/ws-server.js

 
 // server and websocket
 const WebSocket = require('ws');
+var fs = require('fs');
 const http = require('http');
+const https = require('https');
 const path = require('path');
 const express = require('express');
 
 
 app.use('/', router);
 
-var server = http.createServer(app);
+// var server = http.createServer(app);
+var server = https.createServer({
+  key: fs.readFileSync('key.pem'),
+  cert: fs.readFileSync('cert.pem')
+}, app);
 
 server.listen(process.env.port || webSocketsServerPort, function () {
   console.log((new Date()) + ' Server is listening on port ' +