server_tokens off;
charset utf-8;

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

    # Security headers
    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 Permissions-Policy "camera=(), microphone=(), geolocation=()" always;

    # 设计稿迭代期:CSS/JS 不带 hash,不能用 immutable,否则改了浏览器仍吃旧版
    # 缓存 1 小时 + must-revalidate(过期后用 If-Modified-Since 回源验证,服务器没改返回 304,改了取新文件)
    location ~* \.(css|js)$ {
        expires 1h;
        add_header Cache-Control "public, must-revalidate";
    }

    # 图片/字体/媒体:可以缓存稍长(改动频率低),仍允许重新验证
    location ~* \.(png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot|mp4|webm)$ {
        expires 7d;
        add_header Cache-Control "public, must-revalidate";
    }

    # HTML:不进浏览器磁盘缓存,每次都问服务器有没有新版本
    location ~* \.html$ {
        add_header Cache-Control "no-cache, must-revalidate" always;
        expires off;
    }

    # Multi-page (not SPA): try exact file, then .html fallback (friendly URLs), then 404.
    # NEVER fallback to index.html — that masks 404s for a multi-entry design shelf.
    location / {
        try_files $uri $uri/ $uri.html =404;
    }
}