| <!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="Advertises which languages the client is able to understand."><meta name="keywords" content="rust, rustlang, rust-lang, ACCEPT_LANGUAGE"><title>ACCEPT_LANGUAGE in http::header - 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 constant"><!--[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="../../http/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="../../http/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 http::header</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">Constant <a href="../index.html">http</a>::<wbr><a href="index.html">header</a>::<wbr><a class="constant" href="#">ACCEPT_LANGUAGE</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/http/header/name.rs.html#156-987">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 const"><code>pub const ACCEPT_LANGUAGE: <a class="struct" href="struct.HeaderName.html" title="struct http::header::HeaderName">HeaderName</a>;</code></pre></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Advertises which languages the client is able to understand.</p> |
| <p>The Accept-Language request HTTP header advertises which languages the |
| client is able to understand, and which locale variant is preferred. |
| Using content negotiation, the server then selects one of the proposals, |
| uses it and informs the client of its choice with the Content-Language |
| response header. Browsers set adequate values for this header according |
| their user interface language and even if a user can change it, this |
| happens rarely (and is frown upon as it leads to fingerprinting).</p> |
| <p>This header is a hint to be used when the server has no way of |
| determining the language via another way, like a specific URL, that is |
| controlled by an explicit user decision. It is recommended that the |
| server never overrides an explicit decision. The content of the |
| Accept-Language is often out of the control of the user (like when |
| traveling and using an Internet Cafe in a different country); the user |
| may also want to visit a page in another language than the locale of |
| their user interface.</p> |
| <p>If the server cannot serve any matching language, it can theoretically |
| send back a 406 (Not Acceptable) error code. But, for a better user |
| experience, this is rarely done and more common way is to ignore the |
| Accept-Language header in this case.</p> |
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