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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 `actix_web`."><meta name="keywords" content="rust, rustlang, rust-lang, ACCEPT_ENCODING"><title>actix_web::http::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="../../../dark.css"><link rel="stylesheet" type="text/css" href="../../../light.css" id="themeStyle"><script src="../../../storage.js"></script></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><div class="sidebar-elems"><p class='location'><a href='../../index.html'>actix_web</a>::<wbr><a href='../index.html'>http</a>::<wbr><a href='index.html'>header</a></p><script>window.sidebarCurrent = {name: 'ACCEPT_ENCODING', ty: 'constant', relpath: ''};</script><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../../theme.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><input class="search-input" name="search" autocomplete="off" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><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'>actix_web</a>::<wbr><a href='../index.html'>http</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='https://docs.rs/http/0.1.7/src/http/header/name.rs.html#84-86' title='goto source code'>[src]</a></span></h1><pre class='rust const'>pub const ACCEPT_ENCODING: <a class="struct" href="../../../actix_web/http/header/struct.HeaderName.html" title="struct actix_web::http::header::HeaderName">HeaderName</a><code> = </code><code>HeaderName{inner: Repr::Standard(StandardHeader::AcceptEncoding),}</code></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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