server {
    listen 80;
    server_name _;

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

    # gzip
    gzip on;
    gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;
    gzip_min_length 1024;

    # 前端 SPA：所有非 /api 路径回退到 index.html
    location / {
        try_files $uri $uri/ /index.html;
    }

    # 反代到后端
    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_set_header X-Forwarded-Proto $scheme;

        # 流式响应支持（大文件下载 / 日志）
        proxy_buffering off;
        proxy_request_buffering off;
        proxy_read_timeout 3600s;
        proxy_send_timeout 3600s;
    }

    # 健康检查透传
    location /api/health {
        proxy_pass http://backend:8000/api/health;
    }

    # 缓存静态资源
    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf)$ {
        expires 1y;
        add_header Cache-Control "public, immutable";
    }
}