Domain Shield is a managed edge service that keeps your web app reachable for real users when a primary entry domain has availability problems. It activates automatically in the user's browser, switches to a healthy backup, and your team keeps shipping product. Domain Shield 是一套托管的边缘可用性服务。当主入口域名出现可达性问题时，它会在用户浏览器里自动检测并切换到健康的备用入口，业务无中断、研发团队继续专注产品本身。
When an entry domain becomes hard to reach for some users, the cost shows up immediately: lost sessions, lost revenue, support floods. Domain Shield turns that into a non-event. 当某个入口域名对部分用户变得难以访问，代价立刻体现：会话断掉、营收掉、客服爆。Domain Shield 把这件事变成「无事发生」。
Users stay on the app. No manual notice, no chasing users with new links. 用户留在产品里。不用群发新地址、不用客服一个个对接。
Pure edge layer. Your origin, your auth, your stack — untouched. 纯边缘层。源站、登录态、技术栈都不动。
Detection and switch happen in the browser at the network edge — measured in seconds. 检测与切换发生在用户浏览器与边缘之间，秒级生效。
Pick what fits your product. You can change later — same control plane. 按你的产品选；后续可以切换，控制面是同一套。
The session continues on the original address. Backup routing happens silently behind the scenes. Best when brand consistency matters or when users would notice a URL change. 用户感知不到入口在切换，地址栏保持不变，最适合品牌一致性敏感、不希望用户察觉的场景。
On a problem, the browser is sent to a healthy backup entry. The address bar updates, the session continues. Backup entries don't even need our code on them. 出现问题时，浏览器跳到一个健康备用入口；地址栏会变，会话继续。备用入口可以是纯反代，连我们的代码都不需要装。
If a portion of your users suddenly can't reach your entry domain, the metrics often look like a soft churn problem — but it's a reachability problem. We close that gap. 当一部分用户突然访问不到入口域名，看数据像是「自然流失」，其实是可达性问题。我们补上这一层。
Games, media, tools — anywhere a dropped session is a paying user gone. 网页游戏、媒体、工具：会话掉一次，付费用户就走一个。
Users in different regions hit different network conditions. Keep them all online. 不同地区用户网络环境差异大，让他们始终能用上服务。
Checkout, sign-in, real-time sessions — places where a half-loaded page is worse than slow. 结算、登录、实时会话：页面半死不活比慢更糟。
No. We sit at the edge and in the browser. Your application code, origin and auth stay exactly as they are. 不需要。我们只在边缘和浏览器层。业务代码、源站、登录态都不动。
Single-digit seconds in typical conditions, often under 10 seconds end-to-end. 典型条件下个位数秒级，端到端通常在 10 秒内完成。
No. A CDN serves your origin from many edges, but it still resolves through the same entry domain. Domain Shield is about what happens when that entry itself becomes unreachable for some users. 不是。CDN 解决的是源站性能；它仍走同一个入口域名。Domain Shield 解决的是「这个入口本身对一部分用户访问不到」时该怎么办。
Per-tenant subscription with usage-based edge charges. We tailor it to your traffic profile after a short discovery call. 按租户订阅 + 按用量计费；我们简短沟通后会给你贴合实际流量的方案。
Leave an email or any contact you prefer. We reply within one business day with a short discovery call slot. 留下邮箱或你常用的联系方式即可。我们一个工作日内回复，并约一个简短的沟通。