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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="This Rust crate implements IDNA per the WHATWG URL Standard."><title>idna - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/SourceSerif4-Regular-46f98efaafac5295.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><link rel="stylesheet" href="../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../static.files/rustdoc-ac92e1bbe349e143.css"><meta name="rustdoc-vars" data-root-path="../" data-static-root-path="../static.files/" data-current-crate="idna" data-themes="" data-resource-suffix="" data-rustdoc-version="1.76.0 (07dca489a 2024-02-04)" data-channel="1.76.0" data-search-js="search-2b6ce74ff89ae146.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../static.files/storage-f2adc0d6ca4d09fb.js"></script><script defer src="../crates.js"></script><script defer src="../static.files/main-305769736d49e732.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-feafe1bb7466e4bd.css"></noscript><link rel="alternate icon" type="image/png" href="../static.files/favicon-16x16-8b506e7a72182f1c.png"><link rel="alternate icon" type="image/png" href="../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../static.files/favicon-2c020d218678b618.svg"></head><body class="rustdoc mod crate"><!--[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">&#9776;</button></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../idna/index.html">idna</a><span class="version">0.5.0</span></h2></div><div class="sidebar-elems"><ul class="block">
<li><a id="all-types" href="all.html">All Items</a></li></ul><section><ul class="block"><li><a href="#modules">Modules</a></li><li><a href="#structs">Structs</a></li><li><a href="#functions">Functions</a></li></ul></section></div></nav><div class="sidebar-resizer"></div>
<main><div class="width-limiter"><nav class="sub"><form class="search-form"><span></span><div id="sidebar-button" tabindex="-1"><a href="../idna/all.html" title="show sidebar"></a></div><input class="search-input" name="search" aria-label="Run search in the documentation" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" tabindex="-1"><a href="../help.html" title="help">?</a></div><div id="settings-menu" tabindex="-1"><a href="../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../static.files/wheel-7b819b6101059cd0.svg"></a></div></form></nav><section id="main-content" class="content"><div class="main-heading"><h1>Crate <a class="mod" href="#">idna</a><button id="copy-path" title="Copy item path to clipboard"><img src="../static.files/clipboard-7571035ce49a181d.svg" width="19" height="18" alt="Copy item path"></button></h1><span class="out-of-band"><a class="src" href="../src/idna/lib.rs.html#9-86">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>&#x2212;</span>]</button></span></div><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>This Rust crate implements IDNA
<a href="https://url.spec.whatwg.org/#idna">per the WHATWG URL Standard</a>.</p>
<p>It also exposes the underlying algorithms from <a href="http://www.unicode.org/reports/tr46/"><em>Unicode IDNA Compatibility Processing</em>
(Unicode Technical Standard #46)</a>
and <a href="https://tools.ietf.org/html/rfc3492">Punycode (RFC 3492)</a>.</p>
<p>Quoting from <a href="http://www.unicode.org/reports/tr46/#Introduction">UTS #46’s introduction</a>:</p>
<blockquote>
<p>Initially, domain names were restricted to ASCII characters.
A system was introduced in 2003 for internationalized domain names (IDN).
This system is called Internationalizing Domain Names for Applications,
or IDNA2003 for short.
This mechanism supports IDNs by means of a client software transformation
into a format known as Punycode.
A revision of IDNA was approved in 2010 (IDNA2008).
This revision has a number of incompatibilities with IDNA2003.</p>
<p>The incompatibilities force implementers of client software,
such as browsers and emailers,
to face difficult choices during the transition period
as registries shift from IDNA2003 to IDNA2008.
This document specifies a mechanism
that minimizes the impact of this transition for client software,
allowing client software to access domains that are valid under either system.</p>
</blockquote>
</div></details><h2 id="modules" class="section-header"><a href="#modules">Modules</a></h2><ul class="item-table"><li><div class="item-name"><a class="mod" href="punycode/index.html" title="mod idna::punycode">punycode</a></div><div class="desc docblock-short">Punycode (<a href="http://tools.ietf.org/html/rfc3492">RFC 3492</a>) implementation.</div></li></ul><h2 id="structs" class="section-header"><a href="#structs">Structs</a></h2><ul class="item-table"><li><div class="item-name"><a class="struct" href="struct.Config.html" title="struct idna::Config">Config</a></div></li><li><div class="item-name"><a class="struct" href="struct.Errors.html" title="struct idna::Errors">Errors</a></div><div class="desc docblock-short">Errors recorded during UTS #46 processing.</div></li><li><div class="item-name"><a class="struct" href="struct.Idna.html" title="struct idna::Idna">Idna</a></div></li></ul><h2 id="functions" class="section-header"><a href="#functions">Functions</a></h2><ul class="item-table"><li><div class="item-name"><a class="fn" href="fn.domain_to_ascii.html" title="fn idna::domain_to_ascii">domain_to_ascii</a></div><div class="desc docblock-short">The <a href="https://url.spec.whatwg.org/#concept-domain-to-ascii">domain to ASCII</a> algorithm.</div></li><li><div class="item-name"><a class="fn" href="fn.domain_to_ascii_strict.html" title="fn idna::domain_to_ascii_strict">domain_to_ascii_strict</a></div><div class="desc docblock-short">The <a href="https://url.spec.whatwg.org/#concept-domain-to-ascii">domain to ASCII</a> algorithm,
with the <code>beStrict</code> flag set.</div></li><li><div class="item-name"><a class="fn" href="fn.domain_to_unicode.html" title="fn idna::domain_to_unicode">domain_to_unicode</a></div><div class="desc docblock-short">The <a href="https://url.spec.whatwg.org/#concept-domain-to-unicode">domain to Unicode</a> algorithm.</div></li></ul></section></div></main></body></html>
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