Cloudflare Launches AI Proxy Browser Kitesurf
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Cloudflare launches AI proxy browser Kitesurf; the beta version is now available for developers to use for free.
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Cloudflare 发布了一款面向 AI 代理的新浏览器 Kitesurf,试图把浏览器从“给人看”的工具,改成“给模型执行任务”的基础设施。该产品目前以测试版形式上线,开发者可通过 Cloudflare 的 Browser Run 服务免费调用。

不再围绕人类界面设计

Cloudflare 认为,AI 软件正从问答机器人转向可代替用户完成任务的代理系统,而浏览器会成为这一变化中的关键入口。与传统浏览器不同,AI 代理并不依赖主题、标签页或扩展等可视化设计,更关注上下文管理、执行性能、Token 成本和可扩展性。

公司还提到,这类浏览器面对的安全模型也不同。除了常见网络风险外,AI 代理在访问网页和执行指令时,还可能遭遇提示注入等攻击。

12 周内完成开发

Cloudflare 称,Kitesurf 从决定立项到推出仅用了 12 周。该浏览器完全运行在公司无服务器平台 Workers 之上,并已接入 Browser Run。后者允许开发者以编程方式控制 Cloudflare 网络中的无头浏览器实例。

按 Cloudflare 的说法,这一设计可让 AI 代理更高效地使用网页,同时减少对计算资源的占用,从而压低运行成本。

主打低资源占用

Cloudflare 表示,在截图、HTML 提取等常见代理任务中,Kitesurf 的 CPU 和内存消耗明显低于 Chromium。对需要大规模运行自动化代理的开发者来说,这意味着部署成本和扩容压力都可能下降。

Kitesurf 并非从零搭建。其底层整合了多项现有技术,包括 Blitz 的模块化渲染引擎、Firefox 的 CSS 解析器 Stylo,以及基于 Rust 的 ECMAScript 引擎 Boa JS,其余部分则运行在 Cloudflare Workers 中。

目前,Cloudflare 称 Kitesurf 已通过超过 21.5 万项 Web 平台测试,而且每周还在新增数百项通过测试。

受开源项目启发

Cloudflare 还提到,开源 Rust 无头引擎 Obscura 对 Kitesurf 的开发起到了启发作用。公司称,最初的概念验证版本就是把 Obscura 移植到 Workers 之上。

这表明,围绕 AI 代理的新一代浏览器竞争,正从传统前端体验转向执行效率、成本控制和安全能力。

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