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+---
+title: Guard
+slug: Glossary/Guard
+translation_of: Glossary/Guard
+---
+<p>Guard 是 {{domxref("Headers")}} 对象的新特性 (在 {{domxref("Fetch_API","Fetch spec")}} 中定义), 限制了像 {{domxref("Headers.set","set()")}} 和 {{domxref("Headers.append","append()")}} 方法操作 header 的内容. 举个例子, <code>immutable</code> guard 意味着 headers 不能被改变. 阅读 <a href="/en-US/docs/Web/API/Fetch_API/Basic_concepts#Guard">Fetch basic concepts: guard</a>,了解更多信息</p>