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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="URLs use special chacters to indicate the parts of the request. For example, a `?` question mark marks the end of a path and the start of a query string. In order for that character to exist inside a path, it needs to be encoded differently."><meta name="keywords" content="rust, rustlang, rust-lang, percent_encoding"><title>percent_encoding - 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" type="text/css" href="../normalize.css"><link rel="stylesheet" type="text/css" href="../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../dark.css" disabled><link rel="stylesheet" type="text/css" href="../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../storage.js"></script><script src="../crates.js"></script><script defer src="../main.js"></script>
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<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 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="sidebar"><div class="sidebar-menu" role="button">☰</div><a class="sidebar-logo" href="../percent_encoding/index.html"><div class="logo-container"><img class="rust-logo" src="../rust-logo.png" alt="logo"></div>
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</a><h2 class="location">Crate percent_encoding</h2><div class="block version"><div class="narrow-helper"></div><p>Version 2.1.0</p></div><div class="sidebar-elems"><a id="all-types" href="all.html"><p>See all percent_encoding's items</p></a><div class="block items"><ul><li><a href="#structs">Structs</a></li><li><a href="#constants">Constants</a></li><li><a href="#functions">Functions</a></li></ul></div><div id="sidebar-vars" data-name="percent_encoding" data-ty="mod" data-relpath=""></div><script defer src="sidebar-items.js"></script></div></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../percent_encoding/index.html"><img class="rust-logo" src="../rust-logo.png" alt="logo"></a><nav class="sub"><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu" title="themes"><img width="18" height="18" alt="Pick another theme!" src="../brush.svg"></button><div id="theme-choices" role="menu"></div></div><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" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" id="help-button" title="help">?</button><a id="settings-menu" href="../settings.html" title="settings"><img width="18" height="18" alt="Change settings" src="../wheel.svg"></a></div></form></nav></div><section id="main-content" class="content"><h1 class="fqn"><span class="in-band">Crate <a class="mod" href="#">percent_encoding</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></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/percent_encoding/lib.rs.html#9-442" title="goto source code">[src]</a></span></h1><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>URLs use special chacters to indicate the parts of the request.
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For example, a <code>?</code> question mark marks the end of a path and the start of a query string.
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In order for that character to exist inside a path, it needs to be encoded differently.</p>
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<p>Percent encoding replaces reserved characters with the <code>%</code> escape character
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followed by a byte value as two hexadecimal digits.
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For example, an ASCII space is replaced with <code>%20</code>.</p>
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<p>When encoding, the set of characters that can (and should, for readability) be left alone
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depends on the context.
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The <code>?</code> question mark mentioned above is not a separator when used literally
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inside of a query string, and therefore does not need to be encoded.
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The <a href="struct.AsciiSet.html" title="AsciiSet"><code>AsciiSet</code></a> parameter of <a href="fn.percent_encode.html" title="percent_encode"><code>percent_encode</code></a> and <a href="fn.utf8_percent_encode.html" title="utf8_percent_encode"><code>utf8_percent_encode</code></a>
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lets callers configure this.</p>
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<p>This crate delibarately does not provide many different sets.
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Users should consider in what context the encoded string will be used,
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real relevant specifications, and define their own set.
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This is done by using the <code>add</code> method of an existing set.</p>
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<h2 id="examples" class="section-header"><a href="#examples">Examples</a></h2>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use</span> <span class="ident">percent_encoding</span>::{<span class="ident">utf8_percent_encode</span>, <span class="ident">AsciiSet</span>, <span class="ident">CONTROLS</span>};
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<span class="doccomment">/// https://url.spec.whatwg.org/#fragment-percent-encode-set</span>
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<span class="kw">const</span> <span class="ident">FRAGMENT</span>: <span class="kw-2">&</span><span class="ident">AsciiSet</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">CONTROLS</span>.<span class="ident">add</span>(<span class="string">b' '</span>).<span class="ident">add</span>(<span class="string">b'"'</span>).<span class="ident">add</span>(<span class="string">b'<'</span>).<span class="ident">add</span>(<span class="string">b'>'</span>).<span class="ident">add</span>(<span class="string">b'`'</span>);
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<span class="macro">assert_eq!</span>(<span class="ident">utf8_percent_encode</span>(<span class="string">"foo <bar>"</span>, <span class="ident">FRAGMENT</span>).<span class="ident">to_string</span>(), <span class="string">"foo%20%3Cbar%3E"</span>);</code></pre></div>
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</div></details><h2 id="structs" class="small-section-header"><a href="#structs">Structs</a></h2>
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<div class="item-table"><div class="item-row"><div class="item-left module-item"><a class="struct" href="struct.AsciiSet.html" title="percent_encoding::AsciiSet struct">AsciiSet</a></div><div class="item-right docblock-short"><p>Represents a set of characters or bytes in the ASCII range.</p>
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</div></div><div class="item-row"><div class="item-left module-item"><a class="struct" href="struct.PercentDecode.html" title="percent_encoding::PercentDecode struct">PercentDecode</a></div><div class="item-right docblock-short"><p>The return type of <a href="fn.percent_decode.html" title="percent_decode"><code>percent_decode</code></a>.</p>
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</div></div><div class="item-row"><div class="item-left module-item"><a class="struct" href="struct.PercentEncode.html" title="percent_encoding::PercentEncode struct">PercentEncode</a></div><div class="item-right docblock-short"><p>The return type of <a href="fn.percent_encode.html" title="percent_encode"><code>percent_encode</code></a> and <a href="fn.utf8_percent_encode.html" title="utf8_percent_encode"><code>utf8_percent_encode</code></a>.</p>
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</div></div></div><h2 id="constants" class="small-section-header"><a href="#constants">Constants</a></h2>
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<div class="item-table"><div class="item-row"><div class="item-left module-item"><a class="constant" href="constant.CONTROLS.html" title="percent_encoding::CONTROLS constant">CONTROLS</a></div><div class="item-right docblock-short"><p>The set of 0x00 to 0x1F (C0 controls), and 0x7F (DEL).</p>
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</div></div><div class="item-row"><div class="item-left module-item"><a class="constant" href="constant.NON_ALPHANUMERIC.html" title="percent_encoding::NON_ALPHANUMERIC constant">NON_ALPHANUMERIC</a></div><div class="item-right docblock-short"><p>Everything that is not an ASCII letter or digit.</p>
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</div></div></div><h2 id="functions" class="small-section-header"><a href="#functions">Functions</a></h2>
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<div class="item-table"><div class="item-row"><div class="item-left module-item"><a class="fn" href="fn.percent_decode.html" title="percent_encoding::percent_decode fn">percent_decode</a></div><div class="item-right docblock-short"><p>Percent-decode the given bytes.</p>
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</div></div><div class="item-row"><div class="item-left module-item"><a class="fn" href="fn.percent_decode_str.html" title="percent_encoding::percent_decode_str fn">percent_decode_str</a></div><div class="item-right docblock-short"><p>Percent-decode the given string.</p>
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</div></div><div class="item-row"><div class="item-left module-item"><a class="fn" href="fn.percent_encode.html" title="percent_encoding::percent_encode fn">percent_encode</a></div><div class="item-right docblock-short"><p>Percent-encode the given bytes with the given set.</p>
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</div></div><div class="item-row"><div class="item-left module-item"><a class="fn" href="fn.percent_encode_byte.html" title="percent_encoding::percent_encode_byte fn">percent_encode_byte</a></div><div class="item-right docblock-short"><p>Return the percent-encoding of the given byte.</p>
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</div></div><div class="item-row"><div class="item-left module-item"><a class="fn" href="fn.utf8_percent_encode.html" title="percent_encoding::utf8_percent_encode fn">utf8_percent_encode</a></div><div class="item-right docblock-short"><p>Percent-encode the UTF-8 encoding of the given string.</p>
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