How to enable Web Socket in Nginx

1. Add HTTP & Header Configuration to nginx.conf

location /live {
    proxy_pass http://127.0.0.1:4200
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "upgrade";
}

2. Restart Nginx

$ sudo systemctl restart nginx

Reference: https://nginx.org/en/docs/http/websocket.html