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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="API documentation for the Rust `service_fn` fn in crate `hyper`."><meta name="keywords" content="rust, rustlang, rust-lang, service_fn"><title>hyper::service::service_fn - Rust</title><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled ><script id="default-settings"></script><script src="../../storage.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../../favicon.svg">
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<link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><style type="text/css">#crate-search{background-image:url("../../down-arrow.svg");}</style></head><body class="rustdoc fn"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a href='../../hyper/index.html'><div class='logo-container rust-logo'><img src='../../rust-logo.png' alt='logo'></div></a><div class="sidebar-elems"><p class="location"><a href="../index.html">hyper</a>::<wbr><a href="index.html">service</a></p><script>window.sidebarCurrent = {name: "service_fn", ty: "fn", relpath: ""};</script><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu"><img src="../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices" role="menu"></div></div><script src="../../theme.js"></script><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" disabled autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" class="help-button">?</button>
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<a id="settings-menu" href="../../settings.html"><img src="../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class="fqn"><span class="out-of-band"><span id="render-detail"><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">−</span>]</a></span><a class="srclink" href="../../src/hyper/service/util.rs.html#27-36" title="goto source code">[src]</a></span><span class="in-band">Function <a href="../index.html">hyper</a>::<wbr><a href="index.html">service</a>::<wbr><a class="fn" href="">service_fn</a></span></h1><pre class="rust fn">pub fn service_fn<F, R, S>(f: F) -> ServiceFn<F, R> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="struct" href="../../hyper/struct.Request.html" title="struct hyper::Request">Request</a><R>) -> S,<br> S: <a class="trait" href="https://doc.rust-lang.org/nightly/core/future/future/trait.Future.html" title="trait core::future::future::Future">Future</a>, </span></pre><div class="docblock"><p>Create a <code>Service</code> from a function.</p>
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<h1 id="example" class="section-header"><a href="#example">Example</a></h1>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">hyper</span>::{<span class="ident">Body</span>, <span class="ident">Request</span>, <span class="ident">Response</span>, <span class="ident">Version</span>};
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<span class="kw">use</span> <span class="ident">hyper</span>::<span class="ident">service</span>::<span class="ident">service_fn</span>;
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<span class="kw">let</span> <span class="ident">service</span> <span class="op">=</span> <span class="ident">service_fn</span>(<span class="op">|</span><span class="ident">req</span>: <span class="ident">Request</span><span class="op"><</span><span class="ident">Body</span><span class="op">></span><span class="op">|</span> <span class="kw">async</span> <span class="kw">move</span> {
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<span class="kw">if</span> <span class="ident">req</span>.<span class="ident">version</span>() <span class="op">=</span><span class="op">=</span> <span class="ident">Version</span>::<span class="ident">HTTP_11</span> {
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<span class="prelude-val">Ok</span>(<span class="ident">Response</span>::<span class="ident">new</span>(<span class="ident">Body</span>::<span class="ident">from</span>(<span class="string">"Hello World"</span>)))
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} <span class="kw">else</span> {
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<span class="comment">// Note: it's usually better to return a Response</span>
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<span class="comment">// with an appropriate StatusCode instead of an Err.</span>
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<span class="prelude-val">Err</span>(<span class="string">"not HTTP/1.1, abort connection"</span>)
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}
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});</pre></div>
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