map $http_upgrade $proxy_connection {
    default "https_backend";
    websocket "ws_backend";
}

server {
    listen 80;
    server_name example.com;

    location / {
        proxy_pass http://$proxy_connection;
        proxy_set_header Host $host;
        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;
    }
}

upstream rpc_backend {
    server ${PROXY_HOST}:${RPC_PORT}${RPC_PATH:-/};
}

upstream ws_backend {
    server ${PROXY_HOST}:${WS_PORT}${WS_PATH:-/};
}