server {
    listen 80;
    server_tokens off;

    gzip on;
    gzip_types text/plain text/css application/json application/javascript text/javascript;
    gzip_min_length 1024;
    gzip_vary on;

    root /usr/share/nginx/html;
    index index.html;

    add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
    add_header X-Frame-Options "SAMEORIGIN" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header X-XSS-Protection "1; mode=block" always;
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;
    add_header Content-Security-Policy "default-src 'self'; script-src 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline'; img-src 'self' data:; connect-src 'self';" always;

    if ($request_method = TRACE) {
        return 405;
    }

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

    location /api/ {
        proxy_pass http://backend:8000;
        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_read_timeout 60s;
    }
}