Hosting a peerjs server on iisnode, client side unable to connect status "Finished" the status should be "101", not sure why this is happening?

So I have built a WebSocket server on ws and this works perfectly for sending basic messages. What I wanted to do next was create a peer to peer calling service using PeerServer server side and PeerJS client side. However the client cannot connect to the server the WebSocket keeps returning status:"Finished". Again this is specifically iisnode.

Here is my web.config file :

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <system.webServer>
        <handlers>
            <add name="iisnode" path="node_app.js" verb="*" modules="iisnode" />
        </handlers>
        <rewrite>
            <rules>
                <rule name="ws" patternSyntax="ECMAScript" stopProcessing="true">
                    <match url="^NodeJS/WebSocket/WS/?$" />
                    <action type="Rewrite" url="\NodeJS\WebSocket\WS\node_app.js" />
                </rule>
                <rule name="peerjs" patternSyntax="ECMAScript" stopProcessing="true">
                    <match url="^NodeJS/PeerJS/Server/?.*" />
                    <action type="Rewrite" url="\NodeJS\PeerJS\Server\node_app.js" />
                </rule>
            </rules>
        </rewrite>
    </system.webServer>
</configuration>

The rule name="ws" is for the basic WebSocket server.

Server side code for PeerServer "\NodeJS\PeerJS\Server\node_app.js" :

// peer_server
var ExpressPeerServer = require('peer').ExpressPeerServer;
var peerExpress = require('express');
var peerApp = peerExpress();
var peerServer = require('http').createServer(peerApp);
var options = { debug: true }
var peerPort = process.env.PORT;

peerApp.use('/', ExpressPeerServer(peerServer, options));
peerServer.listen(peerPort);

Client side Javascript :

window.addEventListener('load', function() {
    var url = '/NodeJS/PeerJS/Server/'; 
    var peer_url = location.hostname + url;
    var thisCallerID = 123; 
    
    peerJS = new Peer(thisCallerID,{
        host: location.hostname,
        path: url,
        debug: 1
    });
});

The error log I get sever side is :

(node:17520) [DEP0005] DeprecationWarning: Buffer() is deprecated due to security and usability issues. Please use the Buffer.alloc(), Buffer.allocUnsafe(), or Buffer.from() methods instead. (Use node --trace-deprecation ... to show where the warning was cre ated)

However I get this warning on the WebSocket server too and it works just fine.

Any help would be greatly appreciated.

##EDIT##

Client side console errors :

socket.ts:42 WebSocket connection to 'wss://mydomain.co.za/NodeJS/PeerJS/Server?key=peerjs&id=123&token=s0gab0l3rf9&version=1.5.4' failed:

logger.ts:76 ERROR PeerJS: Error: Lost connection to server.

Solution

So it was really quite obvious can't believe I missed this but in case someone else made this mistake too.

In the PeerJS Server file where you set the express app to use the ExpressPeerServer this takes a url path as an argument. This path needs to be the actual URL path of file, in my case "/NodeJS/PeerJS/Server/".

// peer_server
var ExpressPeerServer = require('peer').ExpressPeerServer;
var peerExpress = require('express');
var peerApp = peerExpress();
var peerServer = require('http').createServer(peerApp);
var options = { debug: true }
var peerPort = process.env.PORT;

peerApp.use('/NodeJS/PeerJS/Server/', ExpressPeerServer(peerServer, options));
peerServer.listen(peerPort);