server {
    listen 80;
    root /usr/share/nginx/html;
    index index.html;

    location / {
        try_files $uri /index.html;
    }

    location /protected/ {
        proxy_pass http://${BACKEND_HOST}:${BACKEND_PORT};
        proxy_set_header Host $host;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }
}