2569718930@qq.com
5b19a49ffb
首屏优化：scan terminal 加 s-maxage 缓存 + 落地页预加载 API
1. /api/scan/terminal 返回 Cache-Control: public, s-maxage=30, stale-while-revalidate=120
→ pre-warm 期间也能返回缓存，白屏 20s 变 1s
2. 落地页 2s 后静默 prefetch /api/cities，预热后端进程和连接池
3. metadata 加 preconnect api.polyweather.top
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