freeCodeCamp/curriculum/challenges/chinese/09-information-security/information-security-with-helmetjs/disable-client-side-caching-with-helmet.nocache.md

---
id: 587d8249367417b2b2512c3e
challengeType: 2
forumTopicId: 301576
title: 使用 helment.noCache() 禁用客户端缓存
---

## Description
<section id='description'>
请注意，本项目在 <a href="https://repl.it/github/freeCodeCamp/boilerplate-infosec">这个 Repl.it 项目</a> 的基础上进行开发。你也可以从 <a href='https://github.com/freeCodeCamp/boilerplate-infosec/'>GitHub</a> 上克隆。
如果你为你的网站发布了一个更新，此时你一定想要用户看到最新的版本。为此，你可以通过禁用浏览器缓存来实现。而且，这个功能在开发环境中也非常有用。但另一方面，缓存可以为你的网站带来性能方面的提升，因此你应该只在必要的时候禁用缓存。
</section>

## Instructions
<section id='instructions'>

</section>

## Tests
<section id='tests'>

```yml
tests:
  - text: 应正确加载 helmet.noCache() 中间件
    testString: getUserInput => $.get(getUserInput('url') + '/_api/app-info').then(data => { assert.include(data.appStack, 'nocache'); assert.equal(data.headers['cache-control'], 'no-store, no-cache, must-revalidate, proxy-revalidate'); }, xhr => { throw new Error(xhr.responseText); })

```

</section>

## Challenge Seed
<section id='challengeSeed'>

</section>

## Solution
<section id='solution'>

```js
/**
  Backend challenges don't need solutions, 
  because they would need to be tested against a full working project. 
  Please check our contributing guidelines to learn more.
*/
```

</section>