--- id: cdn-links title: CDN Links permalink: docs/cdn-links.html prev: create-a-new-react-app.html next: release-channels.html --- Both React and ReactDOM are available over a CDN. ```html <script crossorigin src="https://unpkg.com/react@17/umd/react.development.js"></script> <script crossorigin src="https://unpkg.com/react-dom@17/umd/react-dom.development.js"></script> ``` The versions above are only meant for development, and are not suitable for production. Minified and optimized production versions of React are available at: ```html <script crossorigin src="https://unpkg.com/react@17/umd/react.production.min.js"></script> <script crossorigin src="https://unpkg.com/react-dom@17/umd/react-dom.production.min.js"></script> ``` To load a specific version of `react` and `react-dom`, replace `17` with the version number. ### Why the `crossorigin` Attribute? {#why-the-crossorigin-attribute} 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: ```html <script crossorigin src="..."></script> ``` We also recommend to verify that the CDN you are using sets the `Access-Control-Allow-Origin: *` HTTP header:  This enables a better [error handling experience](/blog/2017/07/26/error-handling-in-react-16.html) in React 16 and later.