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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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<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">&#x2212;</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>
<p>The Accept-Encoding request HTTP header advertises which content
encoding, usually a compression algorithm, the client is able to
understand. Using content negotiation, the server selects one of the
proposals, uses it and informs the client of its choice with the
Content-Encoding response header.</p>
<p>Even if both the client and the server supports the same compression
algorithms, the server may choose not to compress the body of a
response, if the identity value is also acceptable. Two common cases
lead to this:</p>
<ul>
<li>
<p>The data to be sent is already compressed and a second compression
won't lead to smaller data to be transmitted. This may the case with
some image formats;</p>
</li>
<li>
<p>The server is overloaded and cannot afford the computational overhead
induced by the compression requirement. Typically, Microsoft recommends
not to compress if a server use more than 80 % of its computational
power.</p>
</li>
</ul>
<p>As long as the identity value, meaning no encryption, is not explicitly
forbidden, by an identity;q=0 or a *;q=0 without another explicitly set
value for identity, the server must never send back a 406 Not Acceptable
error.</p>
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