Websockets on Node-server hosted in Azure fails - node.js

Question

I have a barebone simple example that works locally but not in Azure. My original question was a bit specific to an cors-error, that i have now worked around, and therefor edited away that part. But i still cant manage to make WS work on azure. And i need help.;
var server = http.Server(app);
const wss = new WebSocket.Server({server});
server.listen(8070, () => {
console.log("Listening on " + port)
});
wss.on('connection', (socket) => {
console.log('a user connected');
socket.on('message', (msg) => {
console.log(msg)
socket.send(JSON.stringify({hey:'you'}))
})
});
client connection-string:
SOCKET_ENDPOINT = 'wss://******.azurewebsites.net/';
I've turned on websockets in my app-configuration.
EDIT:
So i have now turned every stone. Even switched library from socket.io to ws. Same problem. I came a little further i think when trying different things, now i get following error "Firefox can’t establish a connection to the server at wss://*******.azurewebsites.net:8070/."
Edit2:
The http-upgrade is fine
Here's the error
Edit 3: Curl command:
* TCP_NODELAY set
* Connected to *******.azurewebsites.net (20.40.202.6) port 443 (#0)
* ALPN, offering h2
* ALPN, offering http/1.1
* successfully set certificate verify locations:
* CAfile: /etc/ssl/certs/ca-certificates.crt
CApath: /etc/ssl/certs
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
* TLSv1.3 (IN), TLS handshake, Server hello (2):
* TLSv1.2 (IN), TLS handshake, Certificate (11):
* TLSv1.2 (IN), TLS handshake, Server key exchange (12):
* TLSv1.2 (IN), TLS handshake, Server finished (14):
* TLSv1.2 (OUT), TLS handshake, Client key exchange (16):
* TLSv1.2 (OUT), TLS change cipher, Change cipher spec (1):
* TLSv1.2 (OUT), TLS handshake, Finished (20):
* TLSv1.2 (IN), TLS handshake, Finished (20):
* SSL connection using TLSv1.2 / ECDHE-RSA-AES256-GCM-SHA384
* ALPN, server did not agree to a protocol
* Server certificate:
* subject: CN=*.azurewebsites.net
* start date: Sep 28 19:00:01 2020 GMT
* expire date: Sep 28 19:00:01 2021 GMT
* subjectAltName: host "********.azurewebsites.net" matched cert's "*.azurewebsites.net"
* issuer: C=US; O=Microsoft Corporation; CN=Microsoft RSA TLS CA 01
* SSL certificate verify ok.
> GET /socket.io/?EIO=4 HTTP/1.1
> Host: *********.azurewebsites.net
> User-Agent: curl/7.68.0
> Accept: */*
>
* Mark bundle as not supporting multiuse
< HTTP/1.1 401 Unauthorized
< Server: Kestrel
< WWW-Authenticate: Bearer realm="********.azurewebsites.net" authorization_uri="https://login.windows.net/<tenant>/oauth2/authorize" resource_id="<resource>"
< Date: Tue, 22 Jun 2021 05:56:15 GMT
< Content-Length: 0
<
* Connection #0 to host *******.azurewebsites.net left intact

Answer 1

I am guessing that you host your app in Azure AppService?
Make sure you have websocket option turned on in platform:
AppService resource -> Settings -> General settings tab -> Platform settings section