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</script></nav></div><div class="container mainContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/facebook/create-react-app/edit/master/docusaurus/docs/proxying-api-requests-in-development.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 class="postHeaderTitle">Proxying API Requests in Development</h1></header><article><div><span><blockquote>
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<p>Note: this feature is available with <code>react-scripts@0.2.3</code> and higher.</p>
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</blockquote>
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<p>People often serve the front-end React app from the same host and port as their backend implementation.<br>
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For example, a production setup might look like this after the app is deployed:</p>
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<pre><code class="hljs">/ - static server returns index.html with React app
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/todos - static server returns index.html with React app
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/api/todos - server handles any /api/* requests using the backend implementation
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</code></pre>
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<p>Such setup is <strong>not</strong> required. However, if you <strong>do</strong> have a setup like this, it is convenient to write requests like <code>fetch('/api/todos')</code> without worrying about redirecting them to another host or port during development.</p>
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<p>To tell the development server to proxy any unknown requests to your API server in development, add a <code>proxy</code> field to your <code>package.json</code>, for example:</p>
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<pre><code class="hljs css language-json"> "proxy": "http://localhost:4000",
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</code></pre>
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<p>This way, when you <code>fetch('/api/todos')</code> in development, the development server will recognize that it’s not a static asset, and will proxy your request to <code>http://localhost:4000/api/todos</code> as a fallback. The development server will <strong>only</strong> attempt to send requests without <code>text/html</code> in its <code>Accept</code> header to the proxy.</p>
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<p>Conveniently, this avoids <a href="https://stackoverflow.com/questions/21854516/understanding-ajax-cors-and-security-considerations">CORS issues</a> and error messages like this in development:</p>
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<pre><code class="hljs">Fetch API cannot <span class="hljs-keyword">load</span> <span class="hljs-keyword">http</span>://localhost:<span class="hljs-number">4000</span>/api/todos. <span class="hljs-keyword">No</span> <span class="hljs-string">'Access-Control-Allow-Origin'</span> header <span class="hljs-keyword">is</span> <span class="hljs-keyword">present</span> <span class="hljs-keyword">on</span> the requested resource. Origin <span class="hljs-string">'http://localhost:3000'</span> <span class="hljs-keyword">is</span> therefore <span class="hljs-keyword">not</span> allowed access. <span class="hljs-keyword">If</span> an <span class="hljs-keyword">opaque</span> response serves your needs, <span class="hljs-keyword">set</span> the request<span class="hljs-string">'s mode to '</span><span class="hljs-keyword">no</span>-cors<span class="hljs-string">' to fetch the resource with CORS disabled.
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</span></code></pre>
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<p>Keep in mind that <code>proxy</code> only has effect in development (with <code>npm start</code>), and it is up to you to ensure that URLs like <code>/api/todos</code> point to the right thing in production. You don’t have to use the <code>/api</code> prefix. Any unrecognized request without a <code>text/html</code> accept header will be redirected to the specified <code>proxy</code>.</p>
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<p>The <code>proxy</code> option supports HTTP, HTTPS and WebSocket connections.<br>
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If the <code>proxy</code> option is <strong>not</strong> flexible enough for you, alternatively you can:</p>
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<ul>
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<li><a href="#configuring-the-proxy-manually">Configure the proxy yourself</a></li>
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<li>Enable CORS on your server (<a href="https://enable-cors.org/server_expressjs.html">here’s how to do it for Express</a>).</li>
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<li>Use <a href="/docs/adding-custom-environment-variables">environment variables</a> to inject the right server host and port into your app.</li>
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</ul>
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<h2><a class="anchor" aria-hidden="true" id="invalid-host-header-errors-after-configuring-proxy"></a><a href="#invalid-host-header-errors-after-configuring-proxy" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>"Invalid Host Header" Errors After Configuring Proxy</h2>
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<p>When you enable the <code>proxy</code> option, you opt into a more strict set of host checks. This is necessary because leaving the backend open to remote hosts makes your computer vulnerable to DNS rebinding attacks. The issue is explained in <a href="https://medium.com/webpack/webpack-dev-server-middleware-security-issues-1489d950874a">this article</a> and <a href="https://github.com/webpack/webpack-dev-server/issues/887">this issue</a>.</p>
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<p>This shouldn’t affect you when developing on <code>localhost</code>, but if you develop remotely like <a href="https://github.com/facebook/create-react-app/issues/2271">described here</a>, you will see this error in the browser after enabling the <code>proxy</code> option:</p>
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<blockquote>
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<p>Invalid Host header</p>
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</blockquote>
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<p>To work around it, you can specify your public development host in a file called <code>.env.development</code> in the root of your project:</p>
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<pre><code class="hljs"><span class="hljs-attr">HOST</span>=mypublicdevhost.com
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</code></pre>
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<p>If you restart the development server now and load the app from the specified host, it should work.</p>
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<p>If you are still having issues or if you’re using a more exotic environment like a cloud editor, you can bypass the host check completely by adding a line to <code>.env.development.local</code>. <strong>Note that this is dangerous and exposes your machine to remote code execution from malicious websites:</strong></p>
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<pre><code class="hljs"><span class="hljs-comment"># <span class="hljs-doctag">NOTE:</span> THIS IS DANGEROUS!</span>
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<span class="hljs-comment"># It exposes your machine to attacks from the websites you visit.</span>
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<span class="hljs-attr">DANGEROUSLY_DISABLE_HOST_CHECK</span>=<span class="hljs-literal">true</span>
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</code></pre>
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<p>We don’t recommend this approach.</p>
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<h2><a class="anchor" aria-hidden="true" id="configuring-the-proxy-manually"></a><a href="#configuring-the-proxy-manually" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Configuring the Proxy Manually</h2>
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<blockquote>
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<p>Note: this feature is available with <code>react-scripts@2.0.0</code> and higher.</p>
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</blockquote>
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<p>If the <code>proxy</code> option is <strong>not</strong> flexible enough for you, you can get direct access to the Express app instance and hook up your own proxy middleware.</p>
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<p>You can use this feature in conjunction with the <code>proxy</code> property in <code>package.json</code>, but it is recommended you consolidate all of your logic into <code>src/setupProxy.js</code>.</p>
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<p>First, install <code>http-proxy-middleware</code> using npm or Yarn:</p>
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<pre><code class="hljs css language-sh">$ npm install http-proxy-middleware --save
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$ <span class="hljs-comment"># or</span>
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$ yarn add http-proxy-middleware
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</code></pre>
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<p>Next, create <code>src/setupProxy.js</code> and place the following contents in it:</p>
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<pre><code class="hljs css language-js"><span class="hljs-keyword">const</span> proxy = <span class="hljs-built_in">require</span>(<span class="hljs-string">'http-proxy-middleware'</span>);
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<span class="hljs-built_in">module</span>.exports = <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">app</span>) </span>{
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<span class="hljs-comment">// ...</span>
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};
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</code></pre>
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<p>You can now register proxies as you wish! Here's an example using the above <code>http-proxy-middleware</code>:</p>
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<pre><code class="hljs css language-js"><span class="hljs-keyword">const</span> proxy = <span class="hljs-built_in">require</span>(<span class="hljs-string">'http-proxy-middleware'</span>);
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<span class="hljs-built_in">module</span>.exports = <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">app</span>) </span>{
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app.use(proxy(<span class="hljs-string">'/api'</span>, { <span class="hljs-attr">target</span>: <span class="hljs-string">'http://localhost:5000/'</span> }));
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};
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</code></pre>
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<blockquote>
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<p><strong>Note:</strong> You do not need to import this file anywhere. It is automatically registered when you start the development server.</p>
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</blockquote>
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<blockquote>
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<p><strong>Note:</strong> This file only supports Node's JavaScript syntax. Be sure to only use supported language features (i.e. no support for Flow, ES Modules, etc).</p>
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</blockquote>
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<blockquote>
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<p><strong>Note:</strong> Passing the path to the proxy function allows you to use globbing and/or pattern matching on the path, which is more flexible than the express route matching.</p>
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</blockquote>
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