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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="Create a `Service` from a function."><title>service_fn in hyper::service - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2"href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../static.files/rustdoc-ca0dd0c4.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="hyper" data-themes="" data-resource-suffix="" data-rustdoc-version="1.93.1 (01f6ddf75 2026-02-11) (Arch Linux rust 1:1.93.1-1)" data-channel="1.93.1" data-search-js="search-9e2438ea.js" data-stringdex-js="stringdex-a3946164.js" data-settings-js="settings-c38705f0.js" ><script src="../../static.files/storage-e2aeef58.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../static.files/main-a410ff4d.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-263c88ec.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-eab170b8.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-044be391.svg"></head><body class="rustdoc fn"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><rustdoc-topbar><h2><a href="#">service_fn</a></h2></rustdoc-topbar><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../../hyper/index.html">hyper</a><span class="version">1.8.1</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">service_<wbr>fn</a></h2><h3><a href="#">Sections</a></h3><ul class="block top-toc"><li><a href="#example" title="Example">Example</a></li></ul></section><div id="rustdoc-modnav"><h2><a href="index.html">In hyper::<wbr>service</a></h2></div></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><div class="width-limiter"><section id="main-content" class="content"><div class="main-heading"><div class="rustdoc-breadcrumbs"><a href="../index.html">hyper</a>::<wbr><a href="index.html">service</a></div><h1>Function <span class="fn">service_<wbr>fn</span>&nbsp;<button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../../src/hyper/service/util.rs.html#30-39">Source</a> </span></div><pre class="rust item-decl"><code>pub fn service_fn&lt;F, R, S&gt;(f: F) -&gt; ServiceFn&lt;F, R&gt;<div class="where">where
F: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/ops/function/trait.Fn.html" title="trait core::ops::function::Fn">Fn</a>(<a class="struct" href="../../http/request/struct.Request.html" title="struct http::request::Request">Request</a>&lt;R&gt;) -&gt; S,
S: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/future/future/trait.Future.html" title="trait core::future::future::Future">Future</a>,</div></code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Create a <code>Service</code> from a function.</p>
<h2 id="example"><a class="doc-anchor" href="#example">§</a>Example</h2>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>bytes::Bytes;
<span class="kw">use </span>hyper::{body, Request, Response, Version};
<span class="kw">use </span>http_body_util::Full;
<span class="kw">use </span>hyper::service::service_fn;
<span class="kw">let </span>service = service_fn(|req: Request&lt;body::Incoming&gt;| <span class="kw">async move </span>{
<span class="kw">if </span>req.version() == Version::HTTP_11 {
<span class="prelude-val">Ok</span>(Response::new(Full::&lt;Bytes&gt;::from(<span class="string">"Hello World"</span>)))
} <span class="kw">else </span>{
<span class="comment">// Note: it's usually better to return a Response
// with an appropriate StatusCode instead of an Err.
</span><span class="prelude-val">Err</span>(<span class="string">"not HTTP/1.1, abort connection"</span>)
}
});</code></pre></div></div></details></section></div></main></body></html>