server {
    listen 80;
    server_name _;
    
    root /usr/share/nginx/html;
    index index.html;
    
    # 启用 gzip 压缩
    gzip on;
    gzip_vary on;
    gzip_min_length 1024;
    gzip_types text/plain text/css text/javascript application/javascript application/json;
    
    # 静态资源缓存
    location /assets {
        expires 1y;
        add_header Cache-Control "public, immutable";
    }
    
    # API 请求反向代理到对应后端
    # 由 nginx 入口根据域名路由
    location /api {
        # 这里的 proxy_pass 会被外层 nginx 覆盖
        # 仅当直接访问前端容器时使用
        return 502;
    }
    
    # SPA 路由支持
    location / {
        try_files $uri $uri/ /index.html;
    }
}