| <!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="Concatenate the buffers from a body into a single `Bytes` asynchronously."><meta name="keywords" content="rust, rustlang, rust-lang, to_bytes"><title>to_bytes in hyper::body - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../normalize.css"><link rel="stylesheet" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../ayu.css" disabled><link rel="stylesheet" href="../../dark.css" disabled><link rel="stylesheet" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.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]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle">☰</button><a class="sidebar-logo" href="../../hyper/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><h2></h2></nav><nav class="sidebar"><a class="sidebar-logo" href="../../hyper/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><div class="sidebar-elems"><h2><a href="index.html">In hyper::body</a></h2></div></nav><main><div class="width-limiter"><nav class="sub"><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="main-heading"><h1 class="fqn">Function <a href="../index.html">hyper</a>::<wbr><a href="index.html">body</a>::<wbr><a class="fn" href="#">to_bytes</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../../clipboard.svg" width="19" height="18" alt="Copy item path"></button></h1><span class="out-of-band"><a class="srclink" href="../../src/hyper/body/to_bytes.rs.html#47-82">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">−</span>]</a></span></div><div class="item-decl"><pre class="rust fn"><code>pub async fn to_bytes<T>(body: T) -> Result<<a class="struct" href="struct.Bytes.html" title="struct hyper::body::Bytes">Bytes</a>, T::<a class="associatedtype" href="trait.HttpBody.html#associatedtype.Error" title="type hyper::body::HttpBody::Error">Error</a>><span class="where fmt-newline">where<br> T: <a class="trait" href="trait.HttpBody.html" title="trait hyper::body::HttpBody">HttpBody</a>,</span></code></pre></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Concatenate the buffers from a body into a single <code>Bytes</code> asynchronously.</p> |
| <p>This may require copying the data into a single buffer. If you don’t need |
| a contiguous buffer, prefer the <a href="fn.aggregate.html"><code>aggregate</code></a> |
| function.</p> |
| <h2 id="note"><a href="#note">Note</a></h2> |
| <p>Care needs to be taken if the remote is untrusted. The function doesn’t implement any length |
| checks and an malicious peer might make it consume arbitrary amounts of memory. Checking the |
| <code>Content-Length</code> is a possibility, but it is not strictly mandated to be present.</p> |
| <h2 id="example"><a href="#example">Example</a></h2> |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>hyper::{body::HttpBody}; |
| |
| <span class="kw">let </span>response = client.request(request).<span class="kw">await</span><span class="question-mark">?</span>; |
| |
| <span class="kw">const </span>MAX_ALLOWED_RESPONSE_SIZE: u64 = <span class="number">1024</span>; |
| |
| <span class="kw">let </span>response_content_length = <span class="kw">match </span>response.body().size_hint().upper() { |
| <span class="prelude-val">Some</span>(v) => v, |
| <span class="prelude-val">None </span>=> MAX_ALLOWED_RESPONSE_SIZE + <span class="number">1 </span><span class="comment">// Just to protect ourselves from a malicious response |
| </span>}; |
| |
| <span class="kw">if </span>response_content_length < MAX_ALLOWED_RESPONSE_SIZE { |
| <span class="kw">let </span>body_bytes = hyper::body::to_bytes(response.into_body()).<span class="kw">await</span><span class="question-mark">?</span>; |
| <span class="macro">println!</span>(<span class="string">"body: {:?}"</span>, body_bytes); |
| } |
| </code></pre></div> |
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