How to configure/allow socket connections on my vps

Question

I am looking for how to configure/allow socket connections on my vps. Currently I have deployed an API that supports websockets except that it just doesn't work on production. Unable to establish a socket connection, only http requests work. I have tried some configs on the nginx server but it has no effect.

The Api runs on port 8000 // server.listen(8000).
So in the sites-enabled folder of nginx I created a file with the name of app domain and I edited this file like this:

server {

        location / {

            proxy_pass http://localhost:8000;

            proxy_set_header X-Real-IP $remote_addr;

            proxy_set_header Host $host;

            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

            proxy_http_version 1.1;

            proxy_set_header Upgrade $http_upgrade;

            proxy_set_header Connection "upgrade";

        }

}

And i edited .htaccess file inside app folder like this :

DirectoryIndex disabled

RewriteEngine On

RewriteRule ^$ http://127.0.0.1:8000/ [P,L]

RewriteCond %{REQUEST_FILENAME} !-f

RewriteCond %{REQUEST_FILENAME} !-d

RewriteRule ^(.*)$ http://127.0.0.1:8000/$1 [P,L]