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<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Networking · React Native</title><meta name="viewport" content="width=device-width"/><meta name="generator" content="Docusaurus"/><meta name="description" content="Many mobile apps need to load resources from a remote URL. You may want to make a POST request to a REST API, or you may need to fetch a chunk of static content from another server."/><meta name="docsearch:version" content="0.13"/><meta name="docsearch:language" content="en"/><meta property="og:title" content="Networking · React Native"/><meta property="og:type" content="website"/><meta property="og:url" content="https://reactnative.dev/"/><meta property="og:description" content="Many mobile apps need to load resources from a remote URL. You may want to make a POST request to a REST API, or you may need to fetch a chunk of static content from another server."/><meta property="og:image" content="https://reactnative.dev/img/logo-og.png"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://reactnative.dev/img/logo-og.png"/><link rel="shortcut icon" href="/img/favicon.ico"/><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/solarized-dark.min.css"/><link rel="alternate" type="application/atom+xml" href="https://reactnative.dev/blog/atom.xml" title="React Native Blog ATOM Feed"/><link rel="alternate" type="application/rss+xml" href="https://reactnative.dev/blog/feed.xml" title="React Native Blog RSS Feed"/><script>
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</script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/facebook/react-native-website/blob/master/docs/network.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">Networking</h1></header><article><div><span><p>Many mobile apps need to load resources from a remote URL. You may want to make a POST request to a REST API, or you may need to fetch a chunk of static content from another server.</p>
<h2><a class="anchor" aria-hidden="true" id="using-fetch"></a><a href="#using-fetch" 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>Using Fetch</h2>
<p>React Native provides the <a href="https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API">Fetch API</a> for your networking needs. Fetch will seem familiar if you have used <code>XMLHttpRequest</code> or other networking APIs before. You may refer to MDN's guide on <a href="https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API/Using_Fetch">Using Fetch</a> for additional information.</p>
<h4><a class="anchor" aria-hidden="true" id="making-requests"></a><a href="#making-requests" 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>Making requests</h4>
<p>In order to fetch content from an arbitrary URL, you can pass the URL to fetch:</p>
<pre><code class="hljs css language-jsx"><span class="token function">fetch</span><span class="token punctuation">(</span><span class="token string">'https://mywebsite.com/mydata.json'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
<p>Fetch also takes an optional second argument that allows you to customize the HTTP request. You may want to specify additional headers, or make a POST request:</p>
<pre><code class="hljs css language-jsx"><span class="token function">fetch</span><span class="token punctuation">(</span><span class="token string">'https://mywebsite.com/endpoint/'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
method<span class="token operator">:</span> <span class="token string">'POST'</span><span class="token punctuation">,</span>
headers<span class="token operator">:</span> <span class="token punctuation">{</span>
Accept<span class="token operator">:</span> <span class="token string">'application/json'</span><span class="token punctuation">,</span>
<span class="token string">'Content-Type'</span><span class="token operator">:</span> <span class="token string">'application/json'</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span>
body<span class="token operator">:</span> <span class="token constant">JSON</span><span class="token punctuation">.</span><span class="token function">stringify</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
firstParam<span class="token operator">:</span> <span class="token string">'yourValue'</span><span class="token punctuation">,</span>
secondParam<span class="token operator">:</span> <span class="token string">'yourOtherValue'</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
<p>Take a look at the <a href="https://developer.mozilla.org/en-US/docs/Web/API/Request">Fetch Request docs</a> for a full list of properties.</p>
<h4><a class="anchor" aria-hidden="true" id="handling-the-response"></a><a href="#handling-the-response" 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>Handling the response</h4>
<p>The above examples show how you can make a request. In many cases, you will want to do something with the response.</p>
<p>Networking is an inherently asynchronous operation. Fetch methods will return a <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise">Promise</a> that makes it straightforward to write code that works in an asynchronous manner:</p>
<pre><code class="hljs css language-jsx"><span class="token keyword">function</span> <span class="token function">getMoviesFromApiAsync</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> <span class="token function">fetch</span><span class="token punctuation">(</span><span class="token string">'https://reactnative.dev/movies.json'</span><span class="token punctuation">)</span>
<span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">response</span><span class="token punctuation">)</span> <span class="token operator">=></span> response<span class="token punctuation">.</span><span class="token function">json</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
<span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">responseJson</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> responseJson<span class="token punctuation">.</span>movies<span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
<span class="token punctuation">.</span><span class="token function">catch</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">error</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
console<span class="token punctuation">.</span><span class="token function">error</span><span class="token punctuation">(</span>error<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre>
<p>You can also use the proposed ES2017 <code>async</code>/<code>await</code> syntax in a React Native app:</p>
<pre><code class="hljs css language-jsx"><span class="token keyword">async</span> <span class="token keyword">function</span> <span class="token function">getMoviesFromApi</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">try</span> <span class="token punctuation">{</span>
<span class="token keyword">let</span> response <span class="token operator">=</span> <span class="token keyword">await</span> <span class="token function">fetch</span><span class="token punctuation">(</span>
<span class="token string">'https://reactnative.dev/movies.json'</span>
<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">let</span> responseJson <span class="token operator">=</span> <span class="token keyword">await</span> response<span class="token punctuation">.</span><span class="token function">json</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> responseJson<span class="token punctuation">.</span>movies<span class="token punctuation">;</span>
<span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span>error<span class="token punctuation">)</span> <span class="token punctuation">{</span>
console<span class="token punctuation">.</span><span class="token function">error</span><span class="token punctuation">(</span>error<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<p>Don't forget to catch any errors that may be thrown by <code>fetch</code>, otherwise they will be dropped silently.</p>
<div class="snack-player"><div class="mobile-friendly-snack" style="display: none"><pre><code class="hljs css javascript"><span class="hljs-keyword">import</span> React <span class="hljs-keyword">from</span> <span class="hljs-string">&#x27;react&#x27;</span>;
<span class="hljs-keyword">import</span> { FlatList, ActivityIndicator, Text, View } <span class="hljs-keyword">from</span> <span class="hljs-string">&#x27;react-native&#x27;</span>;
<span class="hljs-keyword">export</span> <span class="hljs-keyword">default</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">FetchExample</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">React</span>.<span class="hljs-title">Component</span> </span>{
<span class="hljs-keyword">constructor</span>(props){
<span class="hljs-built_in">super</span>(props);
<span class="hljs-built_in">this</span>.state ={ <span class="hljs-attr">isLoading</span>: <span class="hljs-literal">true</span>}
}
componentDidMount(){
<span class="hljs-keyword">return</span> fetch(<span class="hljs-string">&#x27;https://reactnative.dev/movies.json&#x27;</span>)
.then(<span class="hljs-function">(<span class="hljs-params">response</span>) =&gt;</span> response.json())
.then(<span class="hljs-function">(<span class="hljs-params">responseJson</span>) =&gt;</span> {
<span class="hljs-built_in">this</span>.setState({
<span class="hljs-attr">isLoading</span>: <span class="hljs-literal">false</span>,
<span class="hljs-attr">dataSource</span>: responseJson.movies,
}, <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params"></span>)</span>{
});
})
.catch(<span class="hljs-function">(<span class="hljs-params">error</span>) =&gt;</span>{
<span class="hljs-built_in">console</span>.error(error);
});
}
render(){
<span class="hljs-keyword">if</span>(<span class="hljs-built_in">this</span>.state.isLoading){
<span class="hljs-keyword">return</span>(
<span class="xml"><span class="hljs-tag">&lt;<span class="hljs-name">View</span> <span class="hljs-attr">style</span>=<span class="hljs-string">{{flex:</span> <span class="hljs-attr">1</span>, <span class="hljs-attr">padding:</span> <span class="hljs-attr">20</span>}}&gt;</span>
<span class="hljs-tag">&lt;<span class="hljs-name">ActivityIndicator</span>/&gt;</span>
<span class="hljs-tag">&lt;/<span class="hljs-name">View</span>&gt;</span></span>
)
}
<span class="hljs-keyword">return</span>(
<span class="xml"><span class="hljs-tag">&lt;<span class="hljs-name">View</span> <span class="hljs-attr">style</span>=<span class="hljs-string">{{flex:</span> <span class="hljs-attr">1</span>, <span class="hljs-attr">paddingTop:20</span>}}&gt;</span>
<span class="hljs-tag">&lt;<span class="hljs-name">FlatList</span>
<span class="hljs-attr">data</span>=<span class="hljs-string">{this.state.dataSource}</span>
<span class="hljs-attr">renderItem</span>=<span class="hljs-string">{({item})</span> =&gt;</span> <span class="hljs-tag">&lt;<span class="hljs-name">Text</span>&gt;</span>{item.title}, {item.releaseYear}<span class="hljs-tag">&lt;/<span class="hljs-name">Text</span>&gt;</span>}
keyExtractor={({id}, index) =&gt; id}
/&gt;
<span class="hljs-tag">&lt;/<span class="hljs-name">View</span>&gt;</span></span>
);
}
}
</code></pre></div><div class="desktop-friendly-snack" style="margin-top: 15px; margin-bottom: 15px"><div
data-snack-name="Fetch Example"
data-snack-description="Example usage"
data-snack-code="import%20React%20from%20'react'%3B%0Aimport%20%7B%20FlatList%2C%20ActivityIndicator%2C%20Text%2C%20View%20%20%7D%20from%20'react-native'%3B%0A%0Aexport%20default%20class%20FetchExample%20extends%20React.Component%20%7B%0A%0A%20%20constructor(props)%7B%0A%20%20%20%20super(props)%3B%0A%20%20%20%20this.state%20%3D%7B%20isLoading%3A%20true%7D%0A%20%20%7D%0A%0A%20%20componentDidMount()%7B%0A%20%20%20%20return%20fetch('https%3A%2F%2Freactnative.dev%2Fmovies.json')%0A%20%20%20%20%20%20.then((response)%20%3D%3E%20response.json())%0A%20%20%20%20%20%20.then((responseJson)%20%3D%3E%20%7B%0A%0A%20%20%20%20%20%20%20%20this.setState(%7B%0A%20%20%20%20%20%20%20%20%20%20isLoading%3A%20false%2C%0A%20%20%20%20%20%20%20%20%20%20dataSource%3A%20responseJson.movies%2C%0A%20%20%20%20%20%20%20%20%7D%2C%20function()%7B%0A%0A%20%20%20%20%20%20%20%20%7D)%3B%0A%0A%20%20%20%20%20%20%7D)%0A%20%20%20%20%20%20.catch((error)%20%3D%3E%7B%0A%20%20%20%20%20%20%20%20console.error(error)%3B%0A%20%20%20%20%20%20%7D)%3B%0A%20%20%7D%0A%0A%0A%0A%20%20render()%7B%0A%0A%20%20%20%20if(this.state.isLoading)%7B%0A%20%20%20%20%20%20return(%0A%20%20%20%20%20%20%20%20%3CView%20style%3D%7B%7Bflex%3A%201%2C%20padding%3A%2020%7D%7D%3E%0A%20%20%20%20%20%20%20%20%20%20%3CActivityIndicator%2F%3E%0A%20%20%20%20%20%20%20%20%3C%2FView%3E%0A%20%20%20%20%20%20)%0A%20%20%20%20%7D%0A%0A%20%20%20%20return(%0A%20%20%20%20%20%20%3CView%20style%3D%7B%7Bflex%3A%201%2C%20paddingTop%3A20%7D%7D%3E%0A%20%20%20%20%20%20%20%20%3CFlatList%0A%20%20%20%20%20%20%20%20%20%20data%3D%7Bthis.state.dataSource%7D%0A%20%20%20%20%20%20%20%20%20%20renderItem%3D%7B(%7Bitem%7D)%20%3D%3E%20%3CText%3E%7Bitem.title%7D%2C%20%7Bitem.releaseYear%7D%3C%2FText%3E%7D%0A%20%20%20%20%20%20%20%20%20%20keyExtractor%3D%7B(%7Bid%7D%2C%20index)%20%3D%3E%20id%7D%0A%20%20%20%20%20%20%20%20%2F%3E%0A%20%20%20%20%20%20%3C%2FView%3E%0A%20%20%20%20)%3B%0A%20%20%7D%0A%7D%0A"
data-snack-platform="web"
data-snack-supported-platforms=ios,android,web
data-snack-preview="true"
style="
overflow: hidden;
background: #fafafa;
border: 1px solid rgba(0,0,0,.16);
border-radius: 4px;
height: 514px;
width: 100%;
"
></div></div></div><blockquote>
<p>By default, iOS will block any request that's not encrypted using <a href="https://hosting.review/web-hosting-glossary/#12">SSL</a>. If you need to fetch from a cleartext URL (one that begins with <code>http</code>) you will first need to <a href="/docs/0.13/integration-with-existing-apps#test-your-integration">add an App Transport Security exception</a>. If you know ahead of time what domains you will need access to, it is more secure to add exceptions only for those domains; if the domains are not known until runtime you can <a href="/docs/0.13/integration-with-existing-apps#app-transport-security">disable ATS completely</a>. Note however that from January 2017, <a href="https://forums.developer.apple.com/thread/48979">Apple's App Store review will require reasonable justification for disabling ATS</a>. See <a href="https://developer.apple.com/library/ios/documentation/General/Reference/InfoPlistKeyReference/Articles/CocoaKeys.html#//apple_ref/doc/uid/TP40009251-SW33">Apple's documentation</a> for more information.</p>
</blockquote>
<h3><a class="anchor" aria-hidden="true" id="using-other-networking-libraries"></a><a href="#using-other-networking-libraries" 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>Using Other Networking Libraries</h3>
<p>The <a href="https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest">XMLHttpRequest API</a> is built into React Native. This means that you can use third party libraries such as <a href="https://github.com/niftylettuce/frisbee">frisbee</a> or <a href="https://github.com/mzabriskie/axios">axios</a> that depend on it, or you can use the XMLHttpRequest API directly if you prefer.</p>
<pre><code class="hljs css language-jsx"><span class="token keyword">var</span> request <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">XMLHttpRequest</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
request<span class="token punctuation">.</span><span class="token function-variable function">onreadystatechange</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token parameter">e</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>request<span class="token punctuation">.</span>readyState <span class="token operator">!==</span> <span class="token number">4</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">return</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>request<span class="token punctuation">.</span>status <span class="token operator">===</span> <span class="token number">200</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'success'</span><span class="token punctuation">,</span> request<span class="token punctuation">.</span>responseText<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
console<span class="token punctuation">.</span><span class="token function">warn</span><span class="token punctuation">(</span><span class="token string">'error'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
request<span class="token punctuation">.</span><span class="token function">open</span><span class="token punctuation">(</span><span class="token string">'GET'</span><span class="token punctuation">,</span> <span class="token string">'https://mywebsite.com/endpoint/'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
request<span class="token punctuation">.</span><span class="token function">send</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
<blockquote>
<p>The security model for XMLHttpRequest is different than on web as there is no concept of <a href="http://en.wikipedia.org/wiki/Cross-origin_resource_sharing">CORS</a> in native apps.</p>
</blockquote>
<h2><a class="anchor" aria-hidden="true" id="websocket-support"></a><a href="#websocket-support" 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>WebSocket Support</h2>
<p>React Native also supports <a href="https://developer.mozilla.org/en-US/docs/Web/API/WebSocket">WebSockets</a>, a protocol which provides full-duplex communication channels over a single TCP connection.</p>
<pre><code class="hljs css language-jsx"><span class="token keyword">var</span> ws <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">WebSocket</span><span class="token punctuation">(</span><span class="token string">'ws://host.com/path'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
ws<span class="token punctuation">.</span><span class="token function-variable function">onopen</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
<span class="token comment">// connection opened</span>
ws<span class="token punctuation">.</span><span class="token function">send</span><span class="token punctuation">(</span><span class="token string">'something'</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// send a message</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
ws<span class="token punctuation">.</span><span class="token function-variable function">onmessage</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token parameter">e</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
<span class="token comment">// a message was received</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>e<span class="token punctuation">.</span>data<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
ws<span class="token punctuation">.</span><span class="token function-variable function">onerror</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token parameter">e</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
<span class="token comment">// an error occurred</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>e<span class="token punctuation">.</span>message<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
ws<span class="token punctuation">.</span><span class="token function-variable function">onclose</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token parameter">e</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
<span class="token comment">// connection closed</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>e<span class="token punctuation">.</span>code<span class="token punctuation">,</span> e<span class="token punctuation">.</span>reason<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
</code></pre>
<h2><a class="anchor" aria-hidden="true" id="known-issues-with-fetch-and-cookie-based-authentication"></a><a href="#known-issues-with-fetch-and-cookie-based-authentication" 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>Known Issues with <code>fetch</code> and cookie based authentication</h2>
<p>The following options are currently not working with <code>fetch</code></p>
<ul>
<li><code>redirect:manual</code></li>
<li><code>credentials:omit</code></li>
</ul>
<ul>
<li>Having same name headers on Android will result in only the latest one being present. A temporary solution can be found here: <a href="https://github.com/facebook/react-native/issues/18837#issuecomment-398779994">https://github.com/facebook/react-native/issues/18837#issuecomment-398779994</a>.</li>
<li>Cookie based authentication is currently unstable. You can view some of the issues raised here: <a href="https://github.com/facebook/react-native/issues/23185">https://github.com/facebook/react-native/issues/23185</a></li>
<li>As a minimum on iOS, when redirected through a <code>302</code>, if a <code>Set-Cookie</code> header is present, the cookie is not set properly. Since the redirect cannot be handled manually this might cause a scenario where infinite requests occur if the redirect is the result of an expired session.</li>
</ul>
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