40 lines
1.6 KiB
Markdown
40 lines
1.6 KiB
Markdown
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---
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id: 587d8248367417b2b2512c3d
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title: Disable DNS Prefetching with helmet.dnsPrefetchControl()
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challengeType: 2
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videoUrl: ''
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localeTitle: 使用helmet.dnsPrefetchControl（）禁用DNS预取
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---
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## Description
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<section id="description">提醒一下，这个项目是基于<a href="https://glitch.com/#!/import/github/freeCodeCamp/boilerplate-infosec/">Glitch</a>的以下入门项目构建的，或者是从<a href="https://github.com/freeCodeCamp/boilerplate-infosec/">GitHub</a>克隆的。为了提高性能，大多数浏览器都会为页面中的链接预取DNS记录。以这种方式，当用户点击链接时，目标IP已知。这可能导致过度使用DNS服务（如果您拥有一个大网站，数百万人访问......），隐私问题（一个窃听者可能会推断您在某个页面上），或者页面统计信息更改（某些链接可能会即使他们不是，也会出现。）如果您有高安全性需求，则可以以性能损失为代价禁用DNS预取。 </section>
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## Instructions
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<section id="instructions">
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</section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: 应该正确安装helmet.dnsPrefetchControl（）中间件
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testString: 'getUserInput => $.get(getUserInput("url") + "/_api/app-info").then(data => { assert.include(data.appStack, "dnsPrefetchControl"); assert.equal(data.headers["x-dns-prefetch-control"], "off"); }, xhr => { throw new Error(xhr.responseText); })'
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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</section>
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## Solution
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<section id='solution'>
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```js
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// solution required
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```
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</section>
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