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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 `ACCEPT_ENCODING` constant in crate `hyper`."><meta name="keywords" content="rust, rustlang, rust-lang, ACCEPT_ENCODING"><title>hyper::header::ACCEPT_ENCODING - 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 constant"><!--[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">header</a></p><div id="sidebar-vars" data-name="ACCEPT_ENCODING" data-ty="constant" data-relpath=""></div><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="in-band">Constant <a href="../index.html">hyper</a>::<wbr><a href="index.html">header</a>::<wbr><a class="constant" href="">ACCEPT_ENCODING</a></span><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/http/header/name.rs.html#146-965" title="goto source code">[src]</a></span></h1><pre class="rust const">pub const ACCEPT_ENCODING: <a class="struct" href="../../hyper/header/struct.HeaderName.html" title="struct hyper::header::HeaderName">HeaderName</a>;</pre><div class="docblock"><p>Advertises which content encoding the client is able to understand.</p>
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<p>The Accept-Encoding request HTTP header advertises which content
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encoding, usually a compression algorithm, the client is able to
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understand. Using content negotiation, the server selects one of the
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proposals, uses it and informs the client of its choice with the
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Content-Encoding response header.</p>
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<p>Even if both the client and the server supports the same compression
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algorithms, the server may choose not to compress the body of a
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response, if the identity value is also acceptable. Two common cases
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lead to this:</p>
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<ul>
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<li>
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<p>The data to be sent is already compressed and a second compression
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won't lead to smaller data to be transmitted. This may the case with
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some image formats;</p>
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</li>
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<li>
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<p>The server is overloaded and cannot afford the computational overhead
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induced by the compression requirement. Typically, Microsoft recommends
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not to compress if a server use more than 80 % of its computational
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power.</p>
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</li>
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</ul>
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<p>As long as the identity value, meaning no encryption, is not explicitly
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forbidden, by an identity;q=0 or a *;q=0 without another explicitly set
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value for identity, the server must never send back a 406 Not Acceptable
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error.</p>
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