Socket.io call throwing 400 Bad Request for some users

Hi, We have hosted the Nodejs application using nginx as webserver with digicert ssl mapped to it.

user www-data;
worker_processes auto;
pid /run/nginx.pid;
include /etc/nginx/modules-enabled/*.conf;

events {
	worker_connections 768;
}

http {
	sendfile on;
	tcp_nopush on;
	tcp_nodelay on;
	types_hash_max_size 2048;
	server_tokens off;
	include /etc/nginx/mime.types;
	default_type application/octet-stream;
	ssl_protocols TLSv1.2 TLSv1.3; 
	ssl_prefer_server_ciphers on;
	access_log /var/log/nginx/access.log;
	error_log /var/log/nginx/error.log debug;
	add_header Set-Cookie "HttpOnly; Secure";
	add_header X-Frame-Options "SAMEORIGIN";
	gzip off;
	include /etc/nginx/conf.d/*.conf;
	include /etc/nginx/sites-enabled/*;
}

server
{
        listen 80;
        server_name mydomain.com www.mydomain.com;
	    return 301 https://$host$request_uri;
}
server {
	large_client_header_buffers 4 16k;
	listen 443 ssl;
    server_name mydomain.com www.mydomain.com;
    access_log /var/log/nginx/nginx.vhost.access.log;
    error_log /var/log/nginx/nginx.vhost.error.log;
	ssl_certificate /etc/ssl/certs/bundle.crt;
    ssl_certificate_key /etc/ssl/certs/www_mydomain_com.key;
    ssl_prefer_server_ciphers on;

	root /var/www/html;
	index index.html index.htm index.nginx-debian.html;

	location / {
		proxy_http_version 1.1;
		proxy_set_header Upgrade $http_upgrade;
		proxy_set_header Connection "upgrade";
		proxy_redirect off;
		proxy_set_header   X-Forwarded-For $remote_addr;
		proxy_set_header   Host $http_host;
		proxy_pass https://www.mydomain.com:8080;
	}


	location ~ ^/(room|socket\.io) {
		proxy_pass https://www.mydomain.com:8080;
		proxy_http_version 1.1;
		proxy_set_header Upgrade $http_upgrade;
		proxy_set_header Connection "upgrade";
		proxy_set_header Host $http_host;
		proxy_cache_bypass $http_upgrade;
		proxy_set_header X-Real-IP $remote_addr;
		proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
		proxy_set_header X-Forwarded-Proto $scheme;
        proxy_pass_request_headers on;
	}

	location /wsapp {
	    proxy_pass https://www.mydomain.com:8080;
	    proxy_http_version 1.1;
	    proxy_set_header Upgrade $http_upgrade;
	    proxy_set_header Connection "upgrade";
	    proxy_set_header Host $host;
	    proxy_hide_header 'Access-Control-Allow-Origin';
	}	
}

const server = require('https').createServer(credentials, app).listen(8080, 'www.mydoamin.com');
const io = require('socket.io')(server,
    {
	cors: { 
		origin: ["https://www.mydomain.com:*"], 
		methods: ["GET", "POST"],
        	transports: ['websocket', 'polling'],
        	autoConnect: true,
        	pingInterval: 25000, 
        	pingTimeout: 180000, 
	},
	allowEIO3: true,
	cookie: {
		name: "domainio",
		httpOnly: false,
		secure: true
	  }
    });

var socket = io.connect('https://www.mydomain.com',
    {
        'transports': ['polling'],
        'autoConnect': true,
        'pingInterval': 25000, // default - 25000
        'pingTimeout': 180000, // default - 60000  
        'reconnection': true,
        'reconnectionDelay': 1000,
        'reconnectionDelayMax': 5000,
        'reconnectionAttempts': 5,
		'secure': true
    });