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

    location / {
        try_files $uri $uri/ /index.html;
        add_header Cache-Control "no-cache";
    }

    location /backend/ {
        proxy_pass http://${BACKEND_HOST}:${BACKEND_PORT}/;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_cache_bypass $http_upgrade;
    }
}