Nginx 1 · Reverse proxy and TLS
Proxy WebSockets
Pass the upgrade headers so WebSocket connections work through the proxy.
location /ws/ {
proxy_pass http://127.0.0.1:3000;
proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "upgrade";
}
Official Nginx 1 documentation