mirror of
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Dan Abramov
433 lines
15 KiB
HTML
433 lines
15 KiB
HTML
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
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<title>Cross-origin Errors - React</title>
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<meta property="og:title" content="Cross-origin Errors - React">
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<meta property="og:description" content="A JavaScript library for building user interfaces">
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<div class="container">
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<div class="nav-main">
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<div class="wrap">
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<a class="nav-home" href="/react/">
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<img class="nav-logo" src="/react/img/logo.svg" width="36" height="36">
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React
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</a>
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<div class="nav-lists">
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<ul class="nav-site nav-site-internal">
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<li><a href="/react/docs/hello-world.html" class="active">Docs</a></li>
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<li><a href="/react/tutorial/tutorial.html">Tutorial</a></li>
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<li><a href="/react/community/support.html">Community</a></li>
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<section class="content wrap documentationContent">
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<div class="inner-content">
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<a class="edit-page-link" href="https://github.com/facebook/react/tree/master/docs/docs/cross-origin-errors.md" target="_blank">Edit on GitHub</a>
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<h1>
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Cross-origin Errors
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</h1>
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<div class="subHeader"></div>
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<blockquote>
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<p>Note:</p>
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<p>The following section applies only to the development mode of React. Error handling in production mode is done with regular try/catch statements.</p>
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</blockquote>
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<p>In <a href="https://facebook.github.io/react/docs/optimizing-performance.html">development mode</a>, React uses a global <code>error</code> event handler to preserve the "pause on exceptions" behavior of browser DevTools. It also logs errors to the developer console.</p>
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<p>If an error is thrown from a <a href="https://developer.mozilla.org/en-US/docs/Web/Security/Same-origin_policy">different origin</a> the browser will mask its details and React will not be able to log the original error message. This is a security precaution taken by browsers to avoid leaking sensitive information.</p>
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<p>You can simplify the development/debugging process by ensuring that errors are thrown with a same-origin policy. Below are some common causes of cross-origin errors and ways to address them.</p>
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<h3>CDN</h3>
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<p>When loading React (or other libraries that might throw errors) from a CDN, add the <a href="https://developer.mozilla.org/en-US/docs/Web/HTML/CORS_settings_attributes"><code>crossorigin</code></a> attribute to your <code><script></code> tags:</p>
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<div class="highlight"><pre><code class="language-html" data-lang="html"><span class="nt"><script </span><span class="na">crossorigin</span> <span class="na">src=</span><span class="s">"..."</span><span class="nt">></script></span>
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</code></pre></div>
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<p>Also ensure the CDN responds with the <code>Access-Control-Allow-Origin: *</code> HTTP header:</p>
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<p><img src="/react/img/docs/cdn-cors-header.png" alt="Access-Control-Allow-Origin: *"></p>
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<h3>Webpack</h3>
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<p>Some JavaScript bundlers may wrap the application code with <code>eval</code> statements in development. (For example Webpack will do this if <a href="https://webpack.js.org/configuration/devtool/"><code>devtool</code></a> is set to any value containing the word "eval".) This may cause errors to be treated as cross-origin.</p>
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<p>If you use Webpack, we recommend using the <code>cheap-module-source-map</code> setting in development to avoid this problem.</p>
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<div class="docs-prevnext">
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</div>
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</div>
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<div class="nav-docs">
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<!-- Docs Nav -->
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<div class="nav-docs-section">
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<h3>Quick Start</h3>
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<ul>
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<li>
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<a href="/react/docs/installation.html">Installation</a>
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</li>
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<li>
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<a href="/react/docs/hello-world.html">Hello World</a>
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</li>
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<li>
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<a href="/react/docs/introducing-jsx.html">Introducing JSX</a>
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</li>
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<li>
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<a href="/react/docs/rendering-elements.html">Rendering Elements</a>
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</li>
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<li>
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<a href="/react/docs/components-and-props.html">Components and Props</a>
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</li>
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<li>
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<a href="/react/docs/state-and-lifecycle.html">State and Lifecycle</a>
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</li>
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<li>
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<a href="/react/docs/handling-events.html">Handling Events</a>
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</li>
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<li>
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<a href="/react/docs/conditional-rendering.html">Conditional Rendering</a>
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</li>
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<li>
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<a href="/react/docs/lists-and-keys.html">Lists and Keys</a>
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</li>
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<li>
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<a href="/react/docs/forms.html">Forms</a>
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</li>
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<li>
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<a href="/react/docs/lifting-state-up.html">Lifting State Up</a>
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</li>
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<li>
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<a href="/react/docs/composition-vs-inheritance.html">Composition vs Inheritance</a>
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</li>
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<li>
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<a href="/react/docs/thinking-in-react.html">Thinking In React</a>
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</li>
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</ul>
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</div>
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<div class="nav-docs-section">
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<h3>Advanced Guides</h3>
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<ul>
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<li>
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<a href="/react/docs/jsx-in-depth.html">JSX In Depth</a>
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</li>
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<li>
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<a href="/react/docs/typechecking-with-proptypes.html">Typechecking With PropTypes</a>
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</li>
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<li>
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<a href="/react/docs/refs-and-the-dom.html">Refs and the DOM</a>
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</li>
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<li>
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<a href="/react/docs/uncontrolled-components.html">Uncontrolled Components</a>
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</li>
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<li>
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<a href="/react/docs/optimizing-performance.html">Optimizing Performance</a>
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</li>
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<li>
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<a href="/react/docs/react-without-es6.html">React Without ES6</a>
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</li>
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<li>
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<a href="/react/docs/react-without-jsx.html">React Without JSX</a>
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</li>
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<li>
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<a href="/react/docs/reconciliation.html">Reconciliation</a>
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<li>
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<a href="/react/docs/context.html">Context</a>
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<a href="/react/docs/portals.html">Portals</a>
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<a href="/react/docs/web-components.html">Web Components</a>
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<a href="/react/docs/higher-order-components.html">Higher-Order Components</a>
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<li>
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<a href="/react/docs/integrating-with-other-libraries.html">Integrating with Other Libraries</a>
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</li>
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<li>
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<a href="/react/docs/accessibility.html">Accessibility</a>
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</ul>
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<h3>Reference</h3>
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<ul>
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<li>
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<a href="/react/docs/react-api.html">React</a>
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<a href="/react/docs/react-component.html">React.Component</a>
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</ul>
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<li>
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<a href="/react/docs/react-dom.html">ReactDOM</a>
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<li>
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<a href="/react/docs/react-dom-server.html">ReactDOMServer</a>
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<li>
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<a href="/react/docs/dom-elements.html">DOM Elements</a>
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<li>
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<a href="/react/docs/events.html">SyntheticEvent</a>
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<a href="/react/docs/test-utils.html">Test Utilities</a>
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<a href="/react/docs/shallow-renderer.html">Shallow Renderer</a>
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<li>
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<a href="/react/docs/test-renderer.html">Test Renderer</a>
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<li>
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<a href="/react/docs/javascript-environment-requirements.html">JS Environment Requirements</a>
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<!-- Contributing Nav -->
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<h3>Contributing</h3>
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<ul>
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<li>
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<a href="/react/contributing/how-to-contribute.html">How to Contribute</a>
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</li>
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<li>
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<a href="/react/contributing/codebase-overview.html">Codebase Overview</a>
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</li>
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<li>
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<a href="/react/contributing/implementation-notes.html">Implementation Notes</a>
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</li>
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<li>
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<a href="/react/contributing/design-principles.html">Design Principles</a>
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</li>
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</ul>
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</div>
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</section>
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<footer class="nav-footer">
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<a href="/react/" class="nav-home">
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<h5><a href="/react/docs/">Docs</a></h5>
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<a href="/react/docs/hello-world.html">Quick Start</a>
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<a href="/react/docs/thinking-in-react.html">Thinking in React</a>
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<a href="/react/tutorial/tutorial.html">Tutorial</a>
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<h5><a href="/react/community/support.html">Community</a></h5>
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<a href="http://stackoverflow.com/questions/tagged/reactjs" target="_blank">Stack Overflow</a>
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<a href="https://discuss.reactjs.org/" target="_blank">Discussion Forum</a>
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<a href="https://discord.gg/0ZcbPKXt5bZjGY5n" target="_blank">Reactiflux Chat</a>
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<a href="https://www.facebook.com/react" target="_blank">Facebook</a>
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<a href="https://twitter.com/reactjs" target="_blank">Twitter</a>
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<h5><a href="/react/community/support.html">Resources</a></h5>
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<a href="/react/community/conferences.html">Conferences</a>
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<a href="/react/community/videos.html">Videos</a>
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<a href="https://github.com/facebook/react/wiki/Examples" target="_blank">Examples</a>
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<a href="https://github.com/facebook/react/wiki/Complementary-Tools" target="_blank">Complementary Tools</a>
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<div>
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<h5>More</h5>
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<a href="/react/blog/">Blog</a>
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<a href="https://github.com/facebook/react" target="_blank">GitHub</a>
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<a href="http://facebook.github.io/react-native/" target="_blank">React Native</a>
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<a href="/react/acknowledgements.html">Acknowledgements</a>
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</div>
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</section>
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<a href="https://code.facebook.com/projects/" target="_blank" class="fbOpenSource">
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Copyright © 2017 Facebook Inc.
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