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38 lines
1.4 KiB
38 lines
1.4 KiB
7 years ago
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---
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id: cdn-links
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title: CDN Links
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permalink: docs/cdn-links.html
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prev: add-react-to-an-existing-app.html
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next: hello-world.html
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---
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The UMD builds of React and ReactDOM are available over a CDN.
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```html
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<script crossorigin src="https://unpkg.com/react@16/umd/react.development.js"></script>
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<script crossorigin src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"></script>
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```
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The versions above are only meant for development, and are not suitable for production. Minified and optimized production versions of React are available at:
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```html
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<script crossorigin src="https://unpkg.com/react@16/umd/react.production.min.js"></script>
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<script crossorigin src="https://unpkg.com/react-dom@16/umd/react-dom.production.min.js"></script>
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```
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To load a specific version of `react` and `react-dom`, replace `16` with the version number.
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### Why the `crossorigin` Attribute?
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If you serve React from a CDN, we recommend to keep the [`crossorigin`](https://developer.mozilla.org/en-US/docs/Web/HTML/CORS_settings_attributes) attribute set:
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```html
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<script crossorigin src="..."></script>
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```
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We also recommend to verify that the CDN you are using sets the `Access-Control-Allow-Origin: *` HTTP header:
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This enables a better [error handling experience](/blog/2017/07/26/error-handling-in-react-16.html) in React 16 and later.
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