hobokenchicken/GopherGate
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
Files
49701c85add3014c99093db924d917f670eaa8cc
GopherGate/target/doc/http/header/struct.HeaderMap.html
hobokenchicken 49701c85ad Adding large folders
2026-02-26 12:00:21 -05:00

524 lines
119 KiB
HTML
Raw Blame History

This file contains ambiguous Unicode characters
This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.
<!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="A specialized multimap for header names and values."><title>HeaderMap in http::header - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2"href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../static.files/rustdoc-ca0dd0c4.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="http" data-themes="" data-resource-suffix="" data-rustdoc-version="1.93.1 (01f6ddf75 2026-02-11) (Arch Linux rust 1:1.93.1-1)" data-channel="1.93.1" data-search-js="search-9e2438ea.js" data-stringdex-js="stringdex-a3946164.js" data-settings-js="settings-c38705f0.js" ><script src="../../static.files/storage-e2aeef58.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../static.files/main-a410ff4d.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-263c88ec.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-eab170b8.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-044be391.svg"></head><body class="rustdoc struct"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><rustdoc-topbar><h2><a href="#">HeaderMap</a></h2></rustdoc-topbar><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../../http/index.html">http</a><span class="version">1.4.0</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">Header<wbr>Map</a></h2><h3><a href="#">Sections</a></h3><ul class="block top-toc"><li><a href="#overview" title="Overview">Overview</a></li><li><a href="#iteration-order" title="Iteration order">Iteration order</a></li><li><a href="#adaptive-hashing" title="Adaptive hashing">Adaptive hashing</a></li><li><a href="#limitations" title="Limitations">Limitations</a></li><li><a href="#examples" title="Examples">Examples</a></li></ul><h3><a href="#implementations">Methods</a></h3><ul class="block method"><li><a href="#method.append" title="append">append</a></li><li><a href="#method.capacity" title="capacity">capacity</a></li><li><a href="#method.clear" title="clear">clear</a></li><li><a href="#method.contains_key" title="contains_key">contains_key</a></li><li><a href="#method.drain" title="drain">drain</a></li><li><a href="#method.entry" title="entry">entry</a></li><li><a href="#method.get" title="get">get</a></li><li><a href="#method.get_all" title="get_all">get_all</a></li><li><a href="#method.get_mut" title="get_mut">get_mut</a></li><li><a href="#method.insert" title="insert">insert</a></li><li><a href="#method.is_empty" title="is_empty">is_empty</a></li><li><a href="#method.iter" title="iter">iter</a></li><li><a href="#method.iter_mut" title="iter_mut">iter_mut</a></li><li><a href="#method.keys" title="keys">keys</a></li><li><a href="#method.keys_len" title="keys_len">keys_len</a></li><li><a href="#method.len" title="len">len</a></li><li><a href="#method.new" title="new">new</a></li><li><a href="#method.remove" title="remove">remove</a></li><li><a href="#method.reserve" title="reserve">reserve</a></li><li><a href="#method.try_append" title="try_append">try_append</a></li><li><a href="#method.try_entry" title="try_entry">try_entry</a></li><li><a href="#method.try_insert" title="try_insert">try_insert</a></li><li><a href="#method.try_reserve" title="try_reserve">try_reserve</a></li><li><a href="#method.try_with_capacity" title="try_with_capacity">try_with_capacity</a></li><li><a href="#method.values" title="values">values</a></li><li><a href="#method.values_mut" title="values_mut">values_mut</a></li><li><a href="#method.with_capacity" title="with_capacity">with_capacity</a></li></ul><h3><a href="#trait-implementations">Trait Implementations</a></h3><ul class="block trait-implementation"><li><a href="#impl-Clone-for-HeaderMap%3CT%3E" title="Clone">Clone</a></li><li><a href="#impl-Debug-for-HeaderMap%3CT%3E" title="Debug">Debug</a></li><li><a href="#impl-Default-for-HeaderMap%3CT%3E" title="Default">Default</a></li><li><a href="#impl-Eq-for-HeaderMap%3CT%3E" title="Eq">Eq</a></li><li><a href="#impl-Extend%3C(HeaderName,+T)%3E-for-HeaderMap%3CT%3E" title="Extend&#60;(HeaderName, T)&#62;">Extend&#60;(HeaderName, T)&#62;</a></li><li><a href="#impl-Extend%3C(Option%3CHeaderName%3E,+T)%3E-for-HeaderMap%3CT%3E" title="Extend&#60;(Option&#60;HeaderName&#62;, T)&#62;">Extend&#60;(Option&#60;HeaderName&#62;, T)&#62;</a></li><li><a href="#impl-FromIterator%3C(HeaderName,+T)%3E-for-HeaderMap%3CT%3E" title="FromIterator&#60;(HeaderName, T)&#62;">FromIterator&#60;(HeaderName, T)&#62;</a></li><li><a href="#impl-Index%3CK%3E-for-HeaderMap%3CT%3E" title="Index&#60;K&#62;">Index&#60;K&#62;</a></li><li><a href="#impl-IntoIterator-for-%26HeaderMap%3CT%3E" title="IntoIterator">IntoIterator</a></li><li><a href="#impl-IntoIterator-for-%26mut+HeaderMap%3CT%3E" title="IntoIterator">IntoIterator</a></li><li><a href="#impl-IntoIterator-for-HeaderMap%3CT%3E" title="IntoIterator">IntoIterator</a></li><li><a href="#impl-PartialEq-for-HeaderMap%3CT%3E" title="PartialEq">PartialEq</a></li><li><a href="#impl-TryFrom%3C%26HashMap%3CK,+V,+S%3E%3E-for-HeaderMap%3CT%3E" title="TryFrom&#60;&#38;&#39;a HashMap&#60;K, V, S&#62;&#62;">TryFrom&#60;&#38;&#39;a HashMap&#60;K, V, S&#62;&#62;</a></li></ul><h3><a href="#synthetic-implementations">Auto Trait Implementations</a></h3><ul class="block synthetic-implementation"><li><a href="#impl-Freeze-for-HeaderMap%3CT%3E" title="Freeze">Freeze</a></li><li><a href="#impl-RefUnwindSafe-for-HeaderMap%3CT%3E" title="RefUnwindSafe">RefUnwindSafe</a></li><li><a href="#impl-Send-for-HeaderMap%3CT%3E" title="Send">Send</a></li><li><a href="#impl-Sync-for-HeaderMap%3CT%3E" title="Sync">Sync</a></li><li><a href="#impl-Unpin-for-HeaderMap%3CT%3E" title="Unpin">Unpin</a></li><li><a href="#impl-UnwindSafe-for-HeaderMap%3CT%3E" title="UnwindSafe">UnwindSafe</a></li></ul><h3><a href="#blanket-implementations">Blanket Implementations</a></h3><ul class="block blanket-implementation"><li><a href="#impl-Any-for-T" title="Any">Any</a></li><li><a href="#impl-Borrow%3CT%3E-for-T" title="Borrow&#60;T&#62;">Borrow&#60;T&#62;</a></li><li><a href="#impl-BorrowMut%3CT%3E-for-T" title="BorrowMut&#60;T&#62;">BorrowMut&#60;T&#62;</a></li><li><a href="#impl-CloneToUninit-for-T" title="CloneToUninit">CloneToUninit</a></li><li><a href="#impl-From%3CT%3E-for-T" title="From&#60;T&#62;">From&#60;T&#62;</a></li><li><a href="#impl-Into%3CU%3E-for-T" title="Into&#60;U&#62;">Into&#60;U&#62;</a></li><li><a href="#impl-ToOwned-for-T" title="ToOwned">ToOwned</a></li><li><a href="#impl-TryFrom%3CU%3E-for-T" title="TryFrom&#60;U&#62;">TryFrom&#60;U&#62;</a></li><li><a href="#impl-TryInto%3CU%3E-for-T" title="TryInto&#60;U&#62;">TryInto&#60;U&#62;</a></li></ul></section><div id="rustdoc-modnav"><h2><a href="index.html">In http::<wbr>header</a></h2></div></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><div class="width-limiter"><section id="main-content" class="content"><div class="main-heading"><div class="rustdoc-breadcrumbs"><a href="../index.html">http</a>::<wbr><a href="index.html">header</a></div><h1>Struct <span class="struct">Header<wbr>Map</span>&nbsp;<button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../../src/http/header/map.rs.html#81-88">Source</a> </span></div><pre class="rust item-decl"><code>pub struct HeaderMap&lt;T = <a class="struct" href="struct.HeaderValue.html" title="struct http::header::HeaderValue">HeaderValue</a>&gt; { <span class="comment">/* private fields */</span> }</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>A specialized <a href="https://en.wikipedia.org/wiki/Multimap">multimap</a> for
header names and values.</p>
<h2 id="overview"><a class="doc-anchor" href="#overview">§</a>Overview</h2>
<p><code>HeaderMap</code> is designed specifically for efficient manipulation of HTTP
headers. It supports multiple values per header name and provides
specialized APIs for insertion, retrieval, and iteration.</p>
<p>The internal implementation is optimized for common usage patterns in HTTP,
and may change across versions. For example, the current implementation uses
<a href="https://en.wikipedia.org/wiki/Hash_table#Robin_Hood_hashing">Robin Hood
hashing</a> to
store entries compactly and enable high load factors with good performance.
However, the collision resolution strategy and storage mechanism are not
part of the public API and may be altered in future releases.</p>
<h2 id="iteration-order"><a class="doc-anchor" href="#iteration-order">§</a>Iteration order</h2>
<p>Unless otherwise specified, the order in which items are returned by
iterators from <code>HeaderMap</code> methods is arbitrary; there is no guaranteed
ordering among the elements yielded by such an iterator. Changes to the
iteration order are not considered breaking changes, so users must not rely
on any incidental order produced by such an iterator. However, for a given
crate version, the iteration order will be consistent across all platforms.</p>
<h2 id="adaptive-hashing"><a class="doc-anchor" href="#adaptive-hashing">§</a>Adaptive hashing</h2>
<p><code>HeaderMap</code> uses an adaptive strategy for hashing to maintain fast lookups
while resisting hash collision attacks. The default hash function
prioritizes performance. In scenarios where high collision rates are
detected—typically indicative of denial-of-service attacks—the
implementation switches to a more secure, collision-resistant hash function.</p>
<h2 id="limitations"><a class="doc-anchor" href="#limitations">§</a>Limitations</h2>
<p>A <code>HeaderMap</code> can store at most 32,768 entries (header name/value pairs).
Attempting to exceed this limit will result in a panic.</p>
<h2 id="examples"><a class="doc-anchor" href="#examples">§</a>Examples</h2>
<p>Basic usage</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>headers = HeaderMap::new();
headers.insert(HOST, <span class="string">"example.com"</span>.parse().unwrap());
headers.insert(CONTENT_LENGTH, <span class="string">"123"</span>.parse().unwrap());
<span class="macro">assert!</span>(headers.contains_key(HOST));
<span class="macro">assert!</span>(!headers.contains_key(LOCATION));
<span class="macro">assert_eq!</span>(headers[HOST], <span class="string">"example.com"</span>);
headers.remove(HOST);
<span class="macro">assert!</span>(!headers.contains_key(HOST));</code></pre></div></div></details><h2 id="implementations" class="section-header">Implementations<a href="#implementations" class="anchor">§</a></h2><div id="implementations-list"><details class="toggle implementors-toggle" open><summary><section id="impl-HeaderMap" class="impl"><a class="src rightside" href="../../src/http/header/map.rs.html#469-488">Source</a><a href="#impl-HeaderMap" class="anchor">§</a><h3 class="code-header">impl <a class="struct" href="struct.HeaderMap.html" title="struct http::header::HeaderMap">HeaderMap</a></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.new" class="method"><a class="src rightside" href="../../src/http/header/map.rs.html#485-487">Source</a><h4 class="code-header">pub fn <a href="#method.new" class="fn">new</a>() -&gt; Self</h4></section></summary><div class="docblock"><p>Create an empty <code>HeaderMap</code>.</p>
<p>The map will be created without any capacity. This function will not
allocate.</p>
<h5 id="examples-1"><a class="doc-anchor" href="#examples-1">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>map = HeaderMap::new();
<span class="macro">assert!</span>(map.is_empty());
<span class="macro">assert_eq!</span>(<span class="number">0</span>, map.capacity());</code></pre></div></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-HeaderMap%3CT%3E" class="impl"><a class="src rightside" href="../../src/http/header/map.rs.html#502-1822">Source</a><a href="#impl-HeaderMap%3CT%3E" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="struct" href="struct.HeaderMap.html" title="struct http::header::HeaderMap">HeaderMap</a>&lt;T&gt;</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.with_capacity" class="method"><a class="src rightside" href="../../src/http/header/map.rs.html#525-527">Source</a><h4 class="code-header">pub fn <a href="#method.with_capacity" class="fn">with_capacity</a>(capacity: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a>) -&gt; <a class="struct" href="struct.HeaderMap.html" title="struct http::header::HeaderMap">HeaderMap</a>&lt;T&gt;</h4></section></summary><div class="docblock"><p>Create an empty <code>HeaderMap</code> with the specified capacity.</p>
<p>The returned map will allocate internal storage in order to hold about
<code>capacity</code> elements without reallocating. However, this is a “best
effort” as there are usage patterns that could cause additional
allocations before <code>capacity</code> headers are stored in the map.</p>
<p>More capacity than requested may be allocated.</p>
<h5 id="panics"><a class="doc-anchor" href="#panics">§</a>Panics</h5>
<p>This method panics if capacity exceeds max <code>HeaderMap</code> capacity.</p>
<h5 id="examples-2"><a class="doc-anchor" href="#examples-2">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>map: HeaderMap&lt;u32&gt; = HeaderMap::with_capacity(<span class="number">10</span>);
<span class="macro">assert!</span>(map.is_empty());
<span class="macro">assert_eq!</span>(<span class="number">12</span>, map.capacity());</code></pre></div></div></details><details class="toggle method-toggle" open><summary><section id="method.try_with_capacity" class="method"><a class="src rightside" href="../../src/http/header/map.rs.html#551-573">Source</a><h4 class="code-header">pub fn <a href="#method.try_with_capacity" class="fn">try_with_capacity</a>(
capacity: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a>,
) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="struct" href="struct.HeaderMap.html" title="struct http::header::HeaderMap">HeaderMap</a>&lt;T&gt;, <a class="struct" href="struct.MaxSizeReached.html" title="struct http::header::MaxSizeReached">MaxSizeReached</a>&gt;</h4></section></summary><div class="docblock"><p>Create an empty <code>HeaderMap</code> with the specified capacity.</p>
<p>The returned map will allocate internal storage in order to hold about
<code>capacity</code> elements without reallocating. However, this is a “best
effort” as there are usage patterns that could cause additional
allocations before <code>capacity</code> headers are stored in the map.</p>
<p>More capacity than requested may be allocated.</p>
<h5 id="errors"><a class="doc-anchor" href="#errors">§</a>Errors</h5>
<p>This function may return an error if <code>HeaderMap</code> exceeds max capacity</p>
<h5 id="examples-3"><a class="doc-anchor" href="#examples-3">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>map: HeaderMap&lt;u32&gt; = HeaderMap::try_with_capacity(<span class="number">10</span>).unwrap();
<span class="macro">assert!</span>(map.is_empty());
<span class="macro">assert_eq!</span>(<span class="number">12</span>, map.capacity());</code></pre></div></div></details><details class="toggle method-toggle" open><summary><section id="method.len" class="method"><a class="src rightside" href="../../src/http/header/map.rs.html#599-601">Source</a><h4 class="code-header">pub fn <a href="#method.len" class="fn">len</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a></h4></section></summary><div class="docblock"><p>Returns the number of headers stored in the map.</p>
<p>This number represents the total number of <strong>values</strong> stored in the map.
This number can be greater than or equal to the number of <strong>keys</strong>
stored given that a single key may have more than one associated value.</p>
<h5 id="examples-4"><a class="doc-anchor" href="#examples-4">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>map = HeaderMap::new();
<span class="macro">assert_eq!</span>(<span class="number">0</span>, map.len());
map.insert(ACCEPT, <span class="string">"text/plain"</span>.parse().unwrap());
map.insert(HOST, <span class="string">"localhost"</span>.parse().unwrap());
<span class="macro">assert_eq!</span>(<span class="number">2</span>, map.len());
map.append(ACCEPT, <span class="string">"text/html"</span>.parse().unwrap());
<span class="macro">assert_eq!</span>(<span class="number">3</span>, map.len());</code></pre></div></div></details><details class="toggle method-toggle" open><summary><section id="method.keys_len" class="method"><a class="src rightside" href="../../src/http/header/map.rs.html#626-628">Source</a><h4 class="code-header">pub fn <a href="#method.keys_len" class="fn">keys_len</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a></h4></section></summary><div class="docblock"><p>Returns the number of keys stored in the map.</p>
<p>This number will be less than or equal to <code>len()</code> as each key may have
more than one associated value.</p>
<h5 id="examples-5"><a class="doc-anchor" href="#examples-5">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>map = HeaderMap::new();
<span class="macro">assert_eq!</span>(<span class="number">0</span>, map.keys_len());
map.insert(ACCEPT, <span class="string">"text/plain"</span>.parse().unwrap());
map.insert(HOST, <span class="string">"localhost"</span>.parse().unwrap());
<span class="macro">assert_eq!</span>(<span class="number">2</span>, map.keys_len());
map.insert(ACCEPT, <span class="string">"text/html"</span>.parse().unwrap());
<span class="macro">assert_eq!</span>(<span class="number">2</span>, map.keys_len());</code></pre></div></div></details><details class="toggle method-toggle" open><summary><section id="method.is_empty" class="method"><a class="src rightside" href="../../src/http/header/map.rs.html#645-647">Source</a><h4 class="code-header">pub fn <a href="#method.is_empty" class="fn">is_empty</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.bool.html">bool</a></h4></section></summary><div class="docblock"><p>Returns true if the map contains no elements.</p>
<h5 id="examples-6"><a class="doc-anchor" href="#examples-6">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>map = HeaderMap::new();
<span class="macro">assert!</span>(map.is_empty());
map.insert(HOST, <span class="string">"hello.world"</span>.parse().unwrap());
<span class="macro">assert!</span>(!map.is_empty());</code></pre></div></div></details><details class="toggle method-toggle" open><summary><section id="method.clear" class="method"><a class="src rightside" href="../../src/http/header/map.rs.html#664-672">Source</a><h4 class="code-header">pub fn <a href="#method.clear" class="fn">clear</a>(&amp;mut self)</h4></section></summary><div class="docblock"><p>Clears the map, removing all key-value pairs. Keeps the allocated memory
for reuse.</p>
<h5 id="examples-7"><a class="doc-anchor" href="#examples-7">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>map = HeaderMap::new();
map.insert(HOST, <span class="string">"hello.world"</span>.parse().unwrap());
map.clear();
<span class="macro">assert!</span>(map.is_empty());
<span class="macro">assert!</span>(map.capacity() &gt; <span class="number">0</span>);</code></pre></div></div></details><details class="toggle method-toggle" open><summary><section id="method.capacity" class="method"><a class="src rightside" href="../../src/http/header/map.rs.html#691-693">Source</a><h4 class="code-header">pub fn <a href="#method.capacity" class="fn">capacity</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a></h4></section></summary><div class="docblock"><p>Returns the number of headers the map can hold without reallocating.</p>
<p>This number is an approximation as certain usage patterns could cause
additional allocations before the returned capacity is filled.</p>
<h5 id="examples-8"><a class="doc-anchor" href="#examples-8">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>map = HeaderMap::new();
<span class="macro">assert_eq!</span>(<span class="number">0</span>, map.capacity());
map.insert(HOST, <span class="string">"hello.world"</span>.parse().unwrap());
<span class="macro">assert_eq!</span>(<span class="number">6</span>, map.capacity());</code></pre></div></div></details><details class="toggle method-toggle" open><summary><section id="method.reserve" class="method"><a class="src rightside" href="../../src/http/header/map.rs.html#717-720">Source</a><h4 class="code-header">pub fn <a href="#method.reserve" class="fn">reserve</a>(&amp;mut self, additional: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a>)</h4></section></summary><div class="docblock"><p>Reserves capacity for at least <code>additional</code> more headers to be inserted
into the <code>HeaderMap</code>.</p>
<p>The header map may reserve more space to avoid frequent reallocations.
Like with <code>with_capacity</code>, this will be a “best effort” to avoid
allocations until <code>additional</code> more headers are inserted. Certain usage
patterns could cause additional allocations before the number is
reached.</p>
<h5 id="panics-1"><a class="doc-anchor" href="#panics-1">§</a>Panics</h5>
<p>Panics if the new allocation size overflows <code>HeaderMap</code> <code>MAX_SIZE</code>.</p>
<h5 id="examples-9"><a class="doc-anchor" href="#examples-9">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>map = HeaderMap::new();
map.reserve(<span class="number">10</span>);</code></pre></div></div></details><details class="toggle method-toggle" open><summary><section id="method.try_reserve" class="method"><a class="src rightside" href="../../src/http/header/map.rs.html#745-774">Source</a><h4 class="code-header">pub fn <a href="#method.try_reserve" class="fn">try_reserve</a>(&amp;mut self, additional: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.unit.html">()</a>, <a class="struct" href="struct.MaxSizeReached.html" title="struct http::header::MaxSizeReached">MaxSizeReached</a>&gt;</h4></section></summary><div class="docblock"><p>Reserves capacity for at least <code>additional</code> more headers to be inserted
into the <code>HeaderMap</code>.</p>
<p>The header map may reserve more space to avoid frequent reallocations.
Like with <code>with_capacity</code>, this will be a “best effort” to avoid
allocations until <code>additional</code> more headers are inserted. Certain usage
patterns could cause additional allocations before the number is
reached.</p>
<h5 id="errors-1"><a class="doc-anchor" href="#errors-1">§</a>Errors</h5>
<p>This method differs from <code>reserve</code> by returning an error instead of
panicking if the value is too large.</p>
<h5 id="examples-10"><a class="doc-anchor" href="#examples-10">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>map = HeaderMap::new();
map.try_reserve(<span class="number">10</span>).unwrap();</code></pre></div></div></details><details class="toggle method-toggle" open><summary><section id="method.get" class="method"><a class="src rightside" href="../../src/http/header/map.rs.html#797-802">Source</a><h4 class="code-header">pub fn <a href="#method.get" class="fn">get</a>&lt;K&gt;(&amp;self, key: K) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.reference.html">&amp;T</a>&gt;<div class="where">where
K: <a class="trait" href="trait.AsHeaderName.html" title="trait http::header::AsHeaderName">AsHeaderName</a>,</div></h4></section></summary><div class="docblock"><p>Returns a reference to the value associated with the key.</p>
<p>If there are multiple values associated with the key, then the first one
is returned. Use <code>get_all</code> to get all values associated with a given
key. Returns <code>None</code> if there are no values associated with the key.</p>
<h5 id="examples-11"><a class="doc-anchor" href="#examples-11">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>map = HeaderMap::new();
<span class="macro">assert!</span>(map.get(<span class="string">"host"</span>).is_none());
map.insert(HOST, <span class="string">"hello"</span>.parse().unwrap());
<span class="macro">assert_eq!</span>(map.get(HOST).unwrap(), <span class="kw-2">&amp;</span><span class="string">"hello"</span>);
<span class="macro">assert_eq!</span>(map.get(<span class="string">"host"</span>).unwrap(), <span class="kw-2">&amp;</span><span class="string">"hello"</span>);
map.append(HOST, <span class="string">"world"</span>.parse().unwrap());
<span class="macro">assert_eq!</span>(map.get(<span class="string">"host"</span>).unwrap(), <span class="kw-2">&amp;</span><span class="string">"hello"</span>);</code></pre></div></div></details><details class="toggle method-toggle" open><summary><section id="method.get_mut" class="method"><a class="src rightside" href="../../src/http/header/map.rs.html#834-845">Source</a><h4 class="code-header">pub fn <a href="#method.get_mut" class="fn">get_mut</a>&lt;K&gt;(&amp;mut self, key: K) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.reference.html">&amp;mut T</a>&gt;<div class="where">where
K: <a class="trait" href="trait.AsHeaderName.html" title="trait http::header::AsHeaderName">AsHeaderName</a>,</div></h4></section></summary><div class="docblock"><p>Returns a mutable reference to the value associated with the key.</p>
<p>If there are multiple values associated with the key, then the first one
is returned. Use <code>entry</code> to get all values associated with a given
key. Returns <code>None</code> if there are no values associated with the key.</p>
<h5 id="examples-12"><a class="doc-anchor" href="#examples-12">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>map = HeaderMap::default();
map.insert(HOST, <span class="string">"hello"</span>.to_string());
map.get_mut(<span class="string">"host"</span>).unwrap().push_str(<span class="string">"-world"</span>);
<span class="macro">assert_eq!</span>(map.get(HOST).unwrap(), <span class="kw-2">&amp;</span><span class="string">"hello-world"</span>);</code></pre></div></div></details><details class="toggle method-toggle" open><summary><section id="method.get_all" class="method"><a class="src rightside" href="../../src/http/header/map.rs.html#872-880">Source</a><h4 class="code-header">pub fn <a href="#method.get_all" class="fn">get_all</a>&lt;K&gt;(&amp;self, key: K) -&gt; <a class="struct" href="struct.GetAll.html" title="struct http::header::GetAll">GetAll</a>&lt;'_, T&gt;<div class="where">where
K: <a class="trait" href="trait.AsHeaderName.html" title="trait http::header::AsHeaderName">AsHeaderName</a>,</div></h4></section></summary><div class="docblock"><p>Returns a view of all values associated with a key.</p>
<p>The returned view does not incur any allocations and allows iterating
the values associated with the key. See <a href="struct.GetAll.html"><code>GetAll</code></a> for more details.
Returns <code>None</code> if there are no values associated with the key.</p>
<h5 id="examples-13"><a class="doc-anchor" href="#examples-13">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>map = HeaderMap::new();
map.insert(HOST, <span class="string">"hello"</span>.parse().unwrap());
map.append(HOST, <span class="string">"goodbye"</span>.parse().unwrap());
<span class="kw">let </span>view = map.get_all(<span class="string">"host"</span>);
<span class="kw">let </span><span class="kw-2">mut </span>iter = view.iter();
<span class="macro">assert_eq!</span>(<span class="kw-2">&amp;</span><span class="string">"hello"</span>, iter.next().unwrap());
<span class="macro">assert_eq!</span>(<span class="kw-2">&amp;</span><span class="string">"goodbye"</span>, iter.next().unwrap());
<span class="macro">assert!</span>(iter.next().is_none());</code></pre></div></div></details><details class="toggle method-toggle" open><summary><section id="method.contains_key" class="method"><a class="src rightside" href="../../src/http/header/map.rs.html#895-900">Source</a><h4 class="code-header">pub fn <a href="#method.contains_key" class="fn">contains_key</a>&lt;K&gt;(&amp;self, key: K) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.bool.html">bool</a><div class="where">where
K: <a class="trait" href="trait.AsHeaderName.html" title="trait http::header::AsHeaderName">AsHeaderName</a>,</div></h4></section></summary><div class="docblock"><p>Returns true if the map contains a value for the specified key.</p>
<h5 id="examples-14"><a class="doc-anchor" href="#examples-14">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>map = HeaderMap::new();
<span class="macro">assert!</span>(!map.contains_key(HOST));
map.insert(HOST, <span class="string">"world"</span>.parse().unwrap());
<span class="macro">assert!</span>(map.contains_key(<span class="string">"host"</span>));</code></pre></div></div></details><details class="toggle method-toggle" open><summary><section id="method.iter" class="method"><a class="src rightside" href="../../src/http/header/map.rs.html#923-929">Source</a><h4 class="code-header">pub fn <a href="#method.iter" class="fn">iter</a>(&amp;self) -&gt; <a class="struct" href="struct.Iter.html" title="struct http::header::Iter">Iter</a>&lt;'_, T&gt; <a href="#" class="tooltip" data-notable-ty="Iter&lt;&#39;_, T&gt;">ⓘ</a></h4></section></summary><div class="docblock"><p>An iterator visiting all key-value pairs.</p>
<p>The iteration order is arbitrary, but consistent across platforms for
the same crate version. Each key will be yielded once per associated
value. So, if a key has 3 associated values, it will be yielded 3 times.</p>
<h5 id="examples-15"><a class="doc-anchor" href="#examples-15">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>map = HeaderMap::new();
map.insert(HOST, <span class="string">"hello"</span>.parse().unwrap());
map.append(HOST, <span class="string">"goodbye"</span>.parse().unwrap());
map.insert(CONTENT_LENGTH, <span class="string">"123"</span>.parse().unwrap());
<span class="kw">for </span>(key, value) <span class="kw">in </span>map.iter() {
<span class="macro">println!</span>(<span class="string">"{:?}: {:?}"</span>, key, value);
}</code></pre></div></div></details><details class="toggle method-toggle" open><summary><section id="method.iter_mut" class="method"><a class="src rightside" href="../../src/http/header/map.rs.html#952-959">Source</a><h4 class="code-header">pub fn <a href="#method.iter_mut" class="fn">iter_mut</a>(&amp;mut self) -&gt; <a class="struct" href="struct.IterMut.html" title="struct http::header::IterMut">IterMut</a>&lt;'_, T&gt; <a href="#" class="tooltip" data-notable-ty="IterMut&lt;&#39;_, T&gt;">ⓘ</a></h4></section></summary><div class="docblock"><p>An iterator visiting all key-value pairs, with mutable value references.</p>
<p>The iterator order is arbitrary, but consistent across platforms for the
same crate version. Each key will be yielded once per associated value,
so if a key has 3 associated values, it will be yielded 3 times.</p>
<h5 id="examples-16"><a class="doc-anchor" href="#examples-16">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>map = HeaderMap::default();
map.insert(HOST, <span class="string">"hello"</span>.to_string());
map.append(HOST, <span class="string">"goodbye"</span>.to_string());
map.insert(CONTENT_LENGTH, <span class="string">"123"</span>.to_string());
<span class="kw">for </span>(key, value) <span class="kw">in </span>map.iter_mut() {
value.push_str(<span class="string">"-boop"</span>);
}</code></pre></div></div></details><details class="toggle method-toggle" open><summary><section id="method.keys" class="method"><a class="src rightside" href="../../src/http/header/map.rs.html#982-986">Source</a><h4 class="code-header">pub fn <a href="#method.keys" class="fn">keys</a>(&amp;self) -&gt; <a class="struct" href="struct.Keys.html" title="struct http::header::Keys">Keys</a>&lt;'_, T&gt; <a href="#" class="tooltip" data-notable-ty="Keys&lt;&#39;_, T&gt;">ⓘ</a></h4></section></summary><div class="docblock"><p>An iterator visiting all keys.</p>
<p>The iteration order is arbitrary, but consistent across platforms for
the same crate version. Each key will be yielded only once even if it
has multiple associated values.</p>
<h5 id="examples-17"><a class="doc-anchor" href="#examples-17">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>map = HeaderMap::new();
map.insert(HOST, <span class="string">"hello"</span>.parse().unwrap());
map.append(HOST, <span class="string">"goodbye"</span>.parse().unwrap());
map.insert(CONTENT_LENGTH, <span class="string">"123"</span>.parse().unwrap());
<span class="kw">for </span>key <span class="kw">in </span>map.keys() {
<span class="macro">println!</span>(<span class="string">"{:?}"</span>, key);
}</code></pre></div></div></details><details class="toggle method-toggle" open><summary><section id="method.values" class="method"><a class="src rightside" href="../../src/http/header/map.rs.html#1008-1010">Source</a><h4 class="code-header">pub fn <a href="#method.values" class="fn">values</a>(&amp;self) -&gt; <a class="struct" href="struct.Values.html" title="struct http::header::Values">Values</a>&lt;'_, T&gt; <a href="#" class="tooltip" data-notable-ty="Values&lt;&#39;_, T&gt;">ⓘ</a></h4></section></summary><div class="docblock"><p>An iterator visiting all values.</p>
<p>The iteration order is arbitrary, but consistent across platforms for
the same crate version.</p>
<h5 id="examples-18"><a class="doc-anchor" href="#examples-18">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>map = HeaderMap::new();
map.insert(HOST, <span class="string">"hello"</span>.parse().unwrap());
map.append(HOST, <span class="string">"goodbye"</span>.parse().unwrap());
map.insert(CONTENT_LENGTH, <span class="string">"123"</span>.parse().unwrap());
<span class="kw">for </span>value <span class="kw">in </span>map.values() {
<span class="macro">println!</span>(<span class="string">"{:?}"</span>, value);
}</code></pre></div></div></details><details class="toggle method-toggle" open><summary><section id="method.values_mut" class="method"><a class="src rightside" href="../../src/http/header/map.rs.html#1032-1036">Source</a><h4 class="code-header">pub fn <a href="#method.values_mut" class="fn">values_mut</a>(&amp;mut self) -&gt; <a class="struct" href="struct.ValuesMut.html" title="struct http::header::ValuesMut">ValuesMut</a>&lt;'_, T&gt; <a href="#" class="tooltip" data-notable-ty="ValuesMut&lt;&#39;_, T&gt;">ⓘ</a></h4></section></summary><div class="docblock"><p>An iterator visiting all values mutably.</p>
<p>The iteration order is arbitrary, but consistent across platforms for
the same crate version.</p>
<h5 id="examples-19"><a class="doc-anchor" href="#examples-19">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>map = HeaderMap::default();
map.insert(HOST, <span class="string">"hello"</span>.to_string());
map.append(HOST, <span class="string">"goodbye"</span>.to_string());
map.insert(CONTENT_LENGTH, <span class="string">"123"</span>.to_string());
<span class="kw">for </span>value <span class="kw">in </span>map.values_mut() {
value.push_str(<span class="string">"-boop"</span>);
}</code></pre></div></div></details><details class="toggle method-toggle" open><summary><section id="method.drain" class="method"><a class="src rightside" href="../../src/http/header/map.rs.html#1067-1094">Source</a><h4 class="code-header">pub fn <a href="#method.drain" class="fn">drain</a>(&amp;mut self) -&gt; <a class="struct" href="struct.Drain.html" title="struct http::header::Drain">Drain</a>&lt;'_, T&gt; <a href="#" class="tooltip" data-notable-ty="Drain&lt;&#39;_, T&gt;">ⓘ</a></h4></section></summary><div class="docblock"><p>Clears the map, returning all entries as an iterator.</p>
<p>The internal memory is kept for reuse.</p>
<p>For each yielded item that has <code>None</code> provided for the <code>HeaderName</code>,
then the associated header name is the same as that of the previously
yielded item. The first yielded item will have <code>HeaderName</code> set.</p>
<h5 id="examples-20"><a class="doc-anchor" href="#examples-20">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>map = HeaderMap::new();
map.insert(HOST, <span class="string">"hello"</span>.parse().unwrap());
map.append(HOST, <span class="string">"goodbye"</span>.parse().unwrap());
map.insert(CONTENT_LENGTH, <span class="string">"123"</span>.parse().unwrap());
<span class="kw">let </span><span class="kw-2">mut </span>drain = map.drain();
<span class="macro">assert_eq!</span>(drain.next(), <span class="prelude-val">Some</span>((<span class="prelude-val">Some</span>(HOST), <span class="string">"hello"</span>.parse().unwrap())));
<span class="macro">assert_eq!</span>(drain.next(), <span class="prelude-val">Some</span>((<span class="prelude-val">None</span>, <span class="string">"goodbye"</span>.parse().unwrap())));
<span class="macro">assert_eq!</span>(drain.next(), <span class="prelude-val">Some</span>((<span class="prelude-val">Some</span>(CONTENT_LENGTH), <span class="string">"123"</span>.parse().unwrap())));
<span class="macro">assert_eq!</span>(drain.next(), <span class="prelude-val">None</span>);</code></pre></div></div></details><details class="toggle method-toggle" open><summary><section id="method.entry" class="method"><a class="src rightside" href="../../src/http/header/map.rs.html#1168-1173">Source</a><h4 class="code-header">pub fn <a href="#method.entry" class="fn">entry</a>&lt;K&gt;(&amp;mut self, key: K) -&gt; <a class="enum" href="enum.Entry.html" title="enum http::header::Entry">Entry</a>&lt;'_, T&gt;<div class="where">where
K: <a class="trait" href="trait.IntoHeaderName.html" title="trait http::header::IntoHeaderName">IntoHeaderName</a>,</div></h4></section></summary><div class="docblock"><p>Gets the given key’s corresponding entry in the map for in-place
manipulation.</p>
<h5 id="panics-2"><a class="doc-anchor" href="#panics-2">§</a>Panics</h5>
<p>This method panics if capacity exceeds max <code>HeaderMap</code> capacity</p>
<h5 id="examples-21"><a class="doc-anchor" href="#examples-21">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>map: HeaderMap&lt;u32&gt; = HeaderMap::default();
<span class="kw">let </span>headers = <span class="kw-2">&amp;</span>[
<span class="string">"content-length"</span>,
<span class="string">"x-hello"</span>,
<span class="string">"Content-Length"</span>,
<span class="string">"x-world"</span>,
];
<span class="kw">for </span><span class="kw-2">&amp;</span>header <span class="kw">in </span>headers {
<span class="kw">let </span>counter = map.entry(header).or_insert(<span class="number">0</span>);
<span class="kw-2">*</span>counter += <span class="number">1</span>;
}
<span class="macro">assert_eq!</span>(map[<span class="string">"content-length"</span>], <span class="number">2</span>);
<span class="macro">assert_eq!</span>(map[<span class="string">"x-hello"</span>], <span class="number">1</span>);</code></pre></div></div></details><details class="toggle method-toggle" open><summary><section id="method.try_entry" class="method"><a class="src rightside" href="../../src/http/header/map.rs.html#1189-1202">Source</a><h4 class="code-header">pub fn <a href="#method.try_entry" class="fn">try_entry</a>&lt;K&gt;(
&amp;mut self,
key: K,
) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="enum" href="enum.Entry.html" title="enum http::header::Entry">Entry</a>&lt;'_, T&gt;, <a class="struct" href="struct.InvalidHeaderName.html" title="struct http::header::InvalidHeaderName">InvalidHeaderName</a>&gt;<div class="where">where
K: <a class="trait" href="trait.AsHeaderName.html" title="trait http::header::AsHeaderName">AsHeaderName</a>,</div></h4></section></summary><div class="docblock"><p>Gets the given key’s corresponding entry in the map for in-place
manipulation.</p>
<h5 id="errors-2"><a class="doc-anchor" href="#errors-2">§</a>Errors</h5>
<p>This method differs from <code>entry</code> by allowing types that may not be
valid <code>HeaderName</code>s to passed as the key (such as <code>String</code>). If they
do not parse as a valid <code>HeaderName</code>, this returns an
<code>InvalidHeaderName</code> error.</p>
<p>If reserving space goes over the maximum, this will also return an
error. However, to prevent breaking changes to the return type, the
error will still say <code>InvalidHeaderName</code>, unlike other <code>try_*</code> methods
which return a <code>MaxSizeReached</code> error.</p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.insert" class="method"><a class="src rightside" href="../../src/http/header/map.rs.html#1272-1277">Source</a><h4 class="code-header">pub fn <a href="#method.insert" class="fn">insert</a>&lt;K&gt;(&amp;mut self, key: K, val: T) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;T&gt;<div class="where">where
K: <a class="trait" href="trait.IntoHeaderName.html" title="trait http::header::IntoHeaderName">IntoHeaderName</a>,</div></h4></section></summary><div class="docblock"><p>Inserts a key-value pair into the map.</p>
<p>If the map did not previously have this key present, then <code>None</code> is
returned.</p>
<p>If the map did have this key present, the new value is associated with
the key and all previous values are removed. <strong>Note</strong> that only a single
one of the previous values is returned. If there are multiple values
that have been previously associated with the key, then the first one is
returned. See <code>insert_mult</code> on <code>OccupiedEntry</code> for an API that returns
all values.</p>
<p>The key is not updated, though; this matters for types that can be <code>==</code>
without being identical.</p>
<h5 id="panics-3"><a class="doc-anchor" href="#panics-3">§</a>Panics</h5>
<p>This method panics if capacity exceeds max <code>HeaderMap</code> capacity</p>
<h5 id="examples-22"><a class="doc-anchor" href="#examples-22">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>map = HeaderMap::new();
<span class="macro">assert!</span>(map.insert(HOST, <span class="string">"world"</span>.parse().unwrap()).is_none());
<span class="macro">assert!</span>(!map.is_empty());
<span class="kw">let </span><span class="kw-2">mut </span>prev = map.insert(HOST, <span class="string">"earth"</span>.parse().unwrap()).unwrap();
<span class="macro">assert_eq!</span>(<span class="string">"world"</span>, prev);</code></pre></div></div></details><details class="toggle method-toggle" open><summary><section id="method.try_insert" class="method"><a class="src rightside" href="../../src/http/header/map.rs.html#1310-1315">Source</a><h4 class="code-header">pub fn <a href="#method.try_insert" class="fn">try_insert</a>&lt;K&gt;(
&amp;mut self,
key: K,
val: T,
) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="enum" href="https://doc.rust-lang.org/1.93.1/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;T&gt;, <a class="struct" href="struct.MaxSizeReached.html" title="struct http::header::MaxSizeReached">MaxSizeReached</a>&gt;<div class="where">where
K: <a class="trait" href="trait.IntoHeaderName.html" title="trait http::header::IntoHeaderName">IntoHeaderName</a>,</div></h4></section></summary><div class="docblock"><p>Inserts a key-value pair into the map.</p>
<p>If the map did not previously have this key present, then <code>None</code> is
returned.</p>
<p>If the map did have this key present, the new value is associated with
the key and all previous values are removed. <strong>Note</strong> that only a single
one of the previous values is returned. If there are multiple values
that have been previously associated with the key, then the first one is
returned. See <code>insert_mult</code> on <code>OccupiedEntry</code> for an API that returns
all values.</p>
<p>The key is not updated, though; this matters for types that can be <code>==</code>
without being identical.</p>
<h5 id="errors-3"><a class="doc-anchor" href="#errors-3">§</a>Errors</h5>
<p>This function may return an error if <code>HeaderMap</code> exceeds max capacity</p>
<h5 id="examples-23"><a class="doc-anchor" href="#examples-23">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>map = HeaderMap::new();
<span class="macro">assert!</span>(map.try_insert(HOST, <span class="string">"world"</span>.parse().unwrap()).unwrap().is_none());
<span class="macro">assert!</span>(!map.is_empty());
<span class="kw">let </span><span class="kw-2">mut </span>prev = map.try_insert(HOST, <span class="string">"earth"</span>.parse().unwrap()).unwrap().unwrap();
<span class="macro">assert_eq!</span>(<span class="string">"world"</span>, prev);</code></pre></div></div></details><details class="toggle method-toggle" open><summary><section id="method.append" class="method"><a class="src rightside" href="../../src/http/header/map.rs.html#1415-1421">Source</a><h4 class="code-header">pub fn <a href="#method.append" class="fn">append</a>&lt;K&gt;(&amp;mut self, key: K, value: T) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.bool.html">bool</a><div class="where">where
K: <a class="trait" href="trait.IntoHeaderName.html" title="trait http::header::IntoHeaderName">IntoHeaderName</a>,</div></h4></section></summary><div class="docblock"><p>Inserts a key-value pair into the map.</p>
<p>If the map did not previously have this key present, then <code>false</code> is
returned.</p>
<p>If the map did have this key present, the new value is pushed to the end
of the list of values currently associated with the key. The key is not
updated, though; this matters for types that can be <code>==</code> without being
identical.</p>
<h5 id="panics-4"><a class="doc-anchor" href="#panics-4">§</a>Panics</h5>
<p>This method panics if capacity exceeds max <code>HeaderMap</code> capacity</p>
<h5 id="examples-24"><a class="doc-anchor" href="#examples-24">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>map = HeaderMap::new();
<span class="macro">assert!</span>(map.insert(HOST, <span class="string">"world"</span>.parse().unwrap()).is_none());
<span class="macro">assert!</span>(!map.is_empty());
map.append(HOST, <span class="string">"earth"</span>.parse().unwrap());
<span class="kw">let </span>values = map.get_all(<span class="string">"host"</span>);
<span class="kw">let </span><span class="kw-2">mut </span>i = values.iter();
<span class="macro">assert_eq!</span>(<span class="string">"world"</span>, <span class="kw-2">*</span>i.next().unwrap());
<span class="macro">assert_eq!</span>(<span class="string">"earth"</span>, <span class="kw-2">*</span>i.next().unwrap());</code></pre></div></div></details><details class="toggle method-toggle" open><summary><section id="method.try_append" class="method"><a class="src rightside" href="../../src/http/header/map.rs.html#1453-1458">Source</a><h4 class="code-header">pub fn <a href="#method.try_append" class="fn">try_append</a>&lt;K&gt;(
&amp;mut self,
key: K,
value: T,
) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.bool.html">bool</a>, <a class="struct" href="struct.MaxSizeReached.html" title="struct http::header::MaxSizeReached">MaxSizeReached</a>&gt;<div class="where">where
K: <a class="trait" href="trait.IntoHeaderName.html" title="trait http::header::IntoHeaderName">IntoHeaderName</a>,</div></h4></section></summary><div class="docblock"><p>Inserts a key-value pair into the map.</p>
<p>If the map did not previously have this key present, then <code>false</code> is
returned.</p>
<p>If the map did have this key present, the new value is pushed to the end
of the list of values currently associated with the key. The key is not
updated, though; this matters for types that can be <code>==</code> without being
identical.</p>
<h5 id="errors-4"><a class="doc-anchor" href="#errors-4">§</a>Errors</h5>
<p>This function may return an error if <code>HeaderMap</code> exceeds max capacity</p>
<h5 id="examples-25"><a class="doc-anchor" href="#examples-25">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>map = HeaderMap::new();
<span class="macro">assert!</span>(map.try_insert(HOST, <span class="string">"world"</span>.parse().unwrap()).unwrap().is_none());
<span class="macro">assert!</span>(!map.is_empty());
map.try_append(HOST, <span class="string">"earth"</span>.parse().unwrap()).unwrap();
<span class="kw">let </span>values = map.get_all(<span class="string">"host"</span>);
<span class="kw">let </span><span class="kw-2">mut </span>i = values.iter();
<span class="macro">assert_eq!</span>(<span class="string">"world"</span>, <span class="kw-2">*</span>i.next().unwrap());
<span class="macro">assert_eq!</span>(<span class="string">"earth"</span>, <span class="kw-2">*</span>i.next().unwrap());</code></pre></div></div></details><details class="toggle method-toggle" open><summary><section id="method.remove" class="method"><a class="src rightside" href="../../src/http/header/map.rs.html#1572-1588">Source</a><h4 class="code-header">pub fn <a href="#method.remove" class="fn">remove</a>&lt;K&gt;(&amp;mut self, key: K) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;T&gt;<div class="where">where
K: <a class="trait" href="trait.AsHeaderName.html" title="trait http::header::AsHeaderName">AsHeaderName</a>,</div></h4></section></summary><div class="docblock"><p>Removes a key from the map, returning the value associated with the key.</p>
<p>Returns <code>None</code> if the map does not contain the key. If there are
multiple values associated with the key, then the first one is returned.
See <code>remove_entry_mult</code> on <code>OccupiedEntry</code> for an API that yields all
values.</p>
<h5 id="examples-26"><a class="doc-anchor" href="#examples-26">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>map = HeaderMap::new();
map.insert(HOST, <span class="string">"hello.world"</span>.parse().unwrap());
<span class="kw">let </span>prev = map.remove(HOST).unwrap();
<span class="macro">assert_eq!</span>(<span class="string">"hello.world"</span>, prev);
<span class="macro">assert!</span>(map.remove(HOST).is_none());</code></pre></div></div></details></div></details></div><h2 id="trait-implementations" class="section-header">Trait Implementations<a href="#trait-implementations" class="anchor">§</a></h2><div id="trait-implementations-list"><details class="toggle implementors-toggle" open><summary><section id="impl-Clone-for-HeaderMap%3CT%3E" class="impl"><a class="src rightside" href="../../src/http/header/map.rs.html#80">Source</a><a href="#impl-Clone-for-HeaderMap%3CT%3E" class="anchor">§</a><h3 class="code-header">impl&lt;T: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>&gt; <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a> for <a class="struct" href="struct.HeaderMap.html" title="struct http::header::HeaderMap">HeaderMap</a>&lt;T&gt;</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.clone" class="method trait-impl"><a class="src rightside" href="../../src/http/header/map.rs.html#80">Source</a><a href="#method.clone" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/clone/trait.Clone.html#tymethod.clone" class="fn">clone</a>(&amp;self) -&gt; <a class="struct" href="struct.HeaderMap.html" title="struct http::header::HeaderMap">HeaderMap</a>&lt;T&gt;</h4></section></summary><div class='docblock'>Returns a duplicate of the value. <a href="https://doc.rust-lang.org/1.93.1/core/clone/trait.Clone.html#tymethod.clone">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.clone_from" class="method trait-impl"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/1.93.1/src/core/clone.rs.html#245-247">Source</a></span><a href="#method.clone_from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/clone/trait.Clone.html#method.clone_from" class="fn">clone_from</a>(&amp;mut self, source: &amp;Self)</h4></section></summary><div class='docblock'>Performs copy-assignment from <code>source</code>. <a href="https://doc.rust-lang.org/1.93.1/core/clone/trait.Clone.html#method.clone_from">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Debug-for-HeaderMap%3CT%3E" class="impl"><a class="src rightside" href="../../src/http/header/map.rs.html#2218-2222">Source</a><a href="#impl-Debug-for-HeaderMap%3CT%3E" class="anchor">§</a><h3 class="code-header">impl&lt;T: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a>&gt; <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="struct" href="struct.HeaderMap.html" title="struct http::header::HeaderMap">HeaderMap</a>&lt;T&gt;</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.fmt" class="method trait-impl"><a class="src rightside" href="../../src/http/header/map.rs.html#2219-2221">Source</a><a href="#method.fmt" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/fmt/trait.Debug.html#tymethod.fmt" class="fn">fmt</a>(&amp;self, f: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>&lt;'_&gt;) -&gt; <a class="type" href="https://doc.rust-lang.org/1.93.1/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></h4></section></summary><div class='docblock'>Formats the value using the given formatter. <a href="https://doc.rust-lang.org/1.93.1/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Default-for-HeaderMap%3CT%3E" class="impl"><a class="src rightside" href="../../src/http/header/map.rs.html#490-500">Source</a><a href="#impl-Default-for-HeaderMap%3CT%3E" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/default/trait.Default.html" title="trait core::default::Default">Default</a> for <a class="struct" href="struct.HeaderMap.html" title="struct http::header::HeaderMap">HeaderMap</a>&lt;T&gt;</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.default" class="method trait-impl"><a class="src rightside" href="../../src/http/header/map.rs.html#491-499">Source</a><a href="#method.default" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/default/trait.Default.html#tymethod.default" class="fn">default</a>() -&gt; Self</h4></section></summary><div class='docblock'>Returns the “default value” for a type. <a href="https://doc.rust-lang.org/1.93.1/core/default/trait.Default.html#tymethod.default">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Extend%3C(HeaderName,+T)%3E-for-HeaderMap%3CT%3E" class="impl"><a class="src rightside" href="../../src/http/header/map.rs.html#2183-2203">Source</a><a href="#impl-Extend%3C(HeaderName,+T)%3E-for-HeaderMap%3CT%3E" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/iter/traits/collect/trait.Extend.html" title="trait core::iter::traits::collect::Extend">Extend</a>&lt;(<a class="struct" href="struct.HeaderName.html" title="struct http::header::HeaderName">HeaderName</a>, T)&gt; for <a class="struct" href="struct.HeaderMap.html" title="struct http::header::HeaderMap">HeaderMap</a>&lt;T&gt;</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.extend-1" class="method trait-impl"><a class="src rightside" href="../../src/http/header/map.rs.html#2184-2202">Source</a><a href="#method.extend-1" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/iter/traits/collect/trait.Extend.html#tymethod.extend" class="fn">extend</a>&lt;I: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/iter/traits/collect/trait.IntoIterator.html" title="trait core::iter::traits::collect::IntoIterator">IntoIterator</a>&lt;Item = (<a class="struct" href="struct.HeaderName.html" title="struct http::header::HeaderName">HeaderName</a>, T)&gt;&gt;(&amp;mut self, iter: I)</h4></section></summary><div class='docblock'>Extends a collection with the contents of an iterator. <a href="https://doc.rust-lang.org/1.93.1/core/iter/traits/collect/trait.Extend.html#tymethod.extend">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.extend_one-1" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/iter/traits/collect.rs.html#417">Source</a><a href="#method.extend_one-1" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/iter/traits/collect/trait.Extend.html#method.extend_one" class="fn">extend_one</a>(&amp;mut self, item: A)</h4></section></summary><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>extend_one</code>)</span></div></span><div class='docblock'>Extends a collection with exactly one element.</div></details><details class="toggle method-toggle" open><summary><section id="method.extend_reserve-1" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/iter/traits/collect.rs.html#425">Source</a><a href="#method.extend_reserve-1" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/iter/traits/collect/trait.Extend.html#method.extend_reserve" class="fn">extend_reserve</a>(&amp;mut self, additional: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a>)</h4></section></summary><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>extend_one</code>)</span></div></span><div class='docblock'>Reserves capacity in a collection for the given number of additional elements. <a href="https://doc.rust-lang.org/1.93.1/core/iter/traits/collect/trait.Extend.html#method.extend_reserve">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Extend%3C(Option%3CHeaderName%3E,+T)%3E-for-HeaderMap%3CT%3E" class="impl"><a class="src rightside" href="../../src/http/header/map.rs.html#2090-2181">Source</a><a href="#impl-Extend%3C(Option%3CHeaderName%3E,+T)%3E-for-HeaderMap%3CT%3E" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/iter/traits/collect/trait.Extend.html" title="trait core::iter::traits::collect::Extend">Extend</a>&lt;(<a class="enum" href="https://doc.rust-lang.org/1.93.1/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="struct" href="struct.HeaderName.html" title="struct http::header::HeaderName">HeaderName</a>&gt;, T)&gt; for <a class="struct" href="struct.HeaderMap.html" title="struct http::header::HeaderMap">HeaderMap</a>&lt;T&gt;</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.extend" class="method trait-impl"><a class="src rightside" href="../../src/http/header/map.rs.html#2127-2180">Source</a><a href="#method.extend" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/iter/traits/collect/trait.Extend.html#tymethod.extend" class="fn">extend</a>&lt;I: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/iter/traits/collect/trait.IntoIterator.html" title="trait core::iter::traits::collect::IntoIterator">IntoIterator</a>&lt;Item = (<a class="enum" href="https://doc.rust-lang.org/1.93.1/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="struct" href="struct.HeaderName.html" title="struct http::header::HeaderName">HeaderName</a>&gt;, T)&gt;&gt;(&amp;mut self, iter: I)</h4></section></summary><div class="docblock"><p>Extend a <code>HeaderMap</code> with the contents of another <code>HeaderMap</code>.</p>
<p>This function expects the yielded items to follow the same structure as
<code>IntoIter</code>.</p>
<h5 id="panics-5"><a class="doc-anchor" href="#panics-5">§</a>Panics</h5>
<p>This panics if the first yielded item does not have a <code>HeaderName</code>.</p>
<h5 id="examples-29"><a class="doc-anchor" href="#examples-29">§</a>Examples</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>map = HeaderMap::new();
map.insert(ACCEPT, <span class="string">"text/plain"</span>.parse().unwrap());
map.insert(HOST, <span class="string">"hello.world"</span>.parse().unwrap());
<span class="kw">let </span><span class="kw-2">mut </span>extra = HeaderMap::new();
extra.insert(HOST, <span class="string">"foo.bar"</span>.parse().unwrap());
extra.insert(COOKIE, <span class="string">"hello"</span>.parse().unwrap());
extra.append(COOKIE, <span class="string">"world"</span>.parse().unwrap());
map.extend(extra);
<span class="macro">assert_eq!</span>(map[<span class="string">"host"</span>], <span class="string">"foo.bar"</span>);
<span class="macro">assert_eq!</span>(map[<span class="string">"accept"</span>], <span class="string">"text/plain"</span>);
<span class="macro">assert_eq!</span>(map[<span class="string">"cookie"</span>], <span class="string">"hello"</span>);
<span class="kw">let </span>v = map.get_all(<span class="string">"host"</span>);
<span class="macro">assert_eq!</span>(<span class="number">1</span>, v.iter().count());
<span class="kw">let </span>v = map.get_all(<span class="string">"cookie"</span>);
<span class="macro">assert_eq!</span>(<span class="number">2</span>, v.iter().count());</code></pre></div></div></details><details class="toggle method-toggle" open><summary><section id="method.extend_one" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/iter/traits/collect.rs.html#417">Source</a><a href="#method.extend_one" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/iter/traits/collect/trait.Extend.html#method.extend_one" class="fn">extend_one</a>(&amp;mut self, item: A)</h4></section></summary><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>extend_one</code>)</span></div></span><div class='docblock'>Extends a collection with exactly one element.</div></details><details class="toggle method-toggle" open><summary><section id="method.extend_reserve" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/iter/traits/collect.rs.html#425">Source</a><a href="#method.extend_reserve" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/iter/traits/collect/trait.Extend.html#method.extend_reserve" class="fn">extend_reserve</a>(&amp;mut self, additional: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.usize.html">usize</a>)</h4></section></summary><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>extend_one</code>)</span></div></span><div class='docblock'>Reserves capacity in a collection for the given number of additional elements. <a href="https://doc.rust-lang.org/1.93.1/core/iter/traits/collect/trait.Extend.html#method.extend_reserve">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-FromIterator%3C(HeaderName,+T)%3E-for-HeaderMap%3CT%3E" class="impl"><a class="src rightside" href="../../src/http/header/map.rs.html#2043-2052">Source</a><a href="#impl-FromIterator%3C(HeaderName,+T)%3E-for-HeaderMap%3CT%3E" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/iter/traits/collect/trait.FromIterator.html" title="trait core::iter::traits::collect::FromIterator">FromIterator</a>&lt;(<a class="struct" href="struct.HeaderName.html" title="struct http::header::HeaderName">HeaderName</a>, T)&gt; for <a class="struct" href="struct.HeaderMap.html" title="struct http::header::HeaderMap">HeaderMap</a>&lt;T&gt;</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.from_iter" class="method trait-impl"><a class="src rightside" href="../../src/http/header/map.rs.html#2044-2051">Source</a><a href="#method.from_iter" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/iter/traits/collect/trait.FromIterator.html#tymethod.from_iter" class="fn">from_iter</a>&lt;I&gt;(iter: I) -&gt; Self<div class="where">where
I: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/iter/traits/collect/trait.IntoIterator.html" title="trait core::iter::traits::collect::IntoIterator">IntoIterator</a>&lt;Item = (<a class="struct" href="struct.HeaderName.html" title="struct http::header::HeaderName">HeaderName</a>, T)&gt;,</div></h4></section></summary><div class='docblock'>Creates a value from an iterator. <a href="https://doc.rust-lang.org/1.93.1/core/iter/traits/collect/trait.FromIterator.html#tymethod.from_iter">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Index%3CK%3E-for-HeaderMap%3CT%3E" class="impl"><a class="src rightside" href="../../src/http/header/map.rs.html#2224-2239">Source</a><a href="#impl-Index%3CK%3E-for-HeaderMap%3CT%3E" class="anchor">§</a><h3 class="code-header">impl&lt;K, T&gt; <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/ops/index/trait.Index.html" title="trait core::ops::index::Index">Index</a>&lt;K&gt; for <a class="struct" href="struct.HeaderMap.html" title="struct http::header::HeaderMap">HeaderMap</a>&lt;T&gt;<div class="where">where
K: <a class="trait" href="trait.AsHeaderName.html" title="trait http::header::AsHeaderName">AsHeaderName</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.index" class="method trait-impl"><a class="src rightside" href="../../src/http/header/map.rs.html#2233-2238">Source</a><a href="#method.index" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/ops/index/trait.Index.html#tymethod.index" class="fn">index</a>(&amp;self, index: K) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.reference.html">&amp;T</a></h4></section></summary><div class="docblock"><h5 id="panics-6"><a class="doc-anchor" href="#panics-6">§</a>Panics</h5>
<p>Using the index operator will cause a panic if the header you’re querying isn’t set.</p>
</div></details><details class="toggle" open><summary><section id="associatedtype.Output" class="associatedtype trait-impl"><a class="src rightside" href="../../src/http/header/map.rs.html#2228">Source</a><a href="#associatedtype.Output" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.93.1/core/ops/index/trait.Index.html#associatedtype.Output" class="associatedtype">Output</a> = T</h4></section></summary><div class='docblock'>The returned type after indexing.</div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-IntoIterator-for-%26HeaderMap%3CT%3E" class="impl"><a class="src rightside" href="../../src/http/header/map.rs.html#1963-1970">Source</a><a href="#impl-IntoIterator-for-%26HeaderMap%3CT%3E" class="anchor">§</a><h3 class="code-header">impl&lt;'a, T&gt; <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/iter/traits/collect/trait.IntoIterator.html" title="trait core::iter::traits::collect::IntoIterator">IntoIterator</a> for &amp;'a <a class="struct" href="struct.HeaderMap.html" title="struct http::header::HeaderMap">HeaderMap</a>&lt;T&gt;</h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Item" class="associatedtype trait-impl"><a class="src rightside" href="../../src/http/header/map.rs.html#1964">Source</a><a href="#associatedtype.Item" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.93.1/core/iter/traits/collect/trait.IntoIterator.html#associatedtype.Item" class="associatedtype">Item</a> = (&amp;'a <a class="struct" href="struct.HeaderName.html" title="struct http::header::HeaderName">HeaderName</a>, <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.reference.html">&amp;'a T</a>)</h4></section></summary><div class='docblock'>The type of the elements being iterated over.</div></details><details class="toggle" open><summary><section id="associatedtype.IntoIter" class="associatedtype trait-impl"><a class="src rightside" href="../../src/http/header/map.rs.html#1965">Source</a><a href="#associatedtype.IntoIter" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.93.1/core/iter/traits/collect/trait.IntoIterator.html#associatedtype.IntoIter" class="associatedtype">IntoIter</a> = <a class="struct" href="struct.Iter.html" title="struct http::header::Iter">Iter</a>&lt;'a, T&gt;</h4></section></summary><div class='docblock'>Which kind of iterator are we turning this into?</div></details><details class="toggle method-toggle" open><summary><section id="method.into_iter" class="method trait-impl"><a class="src rightside" href="../../src/http/header/map.rs.html#1967-1969">Source</a><a href="#method.into_iter" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/iter/traits/collect/trait.IntoIterator.html#tymethod.into_iter" class="fn">into_iter</a>(self) -&gt; <a class="struct" href="struct.Iter.html" title="struct http::header::Iter">Iter</a>&lt;'a, T&gt; <a href="#" class="tooltip" data-notable-ty="Iter&lt;&#39;a, T&gt;">ⓘ</a></h4></section></summary><div class='docblock'>Creates an iterator from a value. <a href="https://doc.rust-lang.org/1.93.1/core/iter/traits/collect/trait.IntoIterator.html#tymethod.into_iter">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-IntoIterator-for-%26mut+HeaderMap%3CT%3E" class="impl"><a class="src rightside" href="../../src/http/header/map.rs.html#1972-1979">Source</a><a href="#impl-IntoIterator-for-%26mut+HeaderMap%3CT%3E" class="anchor">§</a><h3 class="code-header">impl&lt;'a, T&gt; <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/iter/traits/collect/trait.IntoIterator.html" title="trait core::iter::traits::collect::IntoIterator">IntoIterator</a> for &amp;'a mut <a class="struct" href="struct.HeaderMap.html" title="struct http::header::HeaderMap">HeaderMap</a>&lt;T&gt;</h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Item-1" class="associatedtype trait-impl"><a class="src rightside" href="../../src/http/header/map.rs.html#1973">Source</a><a href="#associatedtype.Item-1" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.93.1/core/iter/traits/collect/trait.IntoIterator.html#associatedtype.Item" class="associatedtype">Item</a> = (&amp;'a <a class="struct" href="struct.HeaderName.html" title="struct http::header::HeaderName">HeaderName</a>, <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.reference.html">&amp;'a mut T</a>)</h4></section></summary><div class='docblock'>The type of the elements being iterated over.</div></details><details class="toggle" open><summary><section id="associatedtype.IntoIter-1" class="associatedtype trait-impl"><a class="src rightside" href="../../src/http/header/map.rs.html#1974">Source</a><a href="#associatedtype.IntoIter-1" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.93.1/core/iter/traits/collect/trait.IntoIterator.html#associatedtype.IntoIter" class="associatedtype">IntoIter</a> = <a class="struct" href="struct.IterMut.html" title="struct http::header::IterMut">IterMut</a>&lt;'a, T&gt;</h4></section></summary><div class='docblock'>Which kind of iterator are we turning this into?</div></details><details class="toggle method-toggle" open><summary><section id="method.into_iter-1" class="method trait-impl"><a class="src rightside" href="../../src/http/header/map.rs.html#1976-1978">Source</a><a href="#method.into_iter-1" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/iter/traits/collect/trait.IntoIterator.html#tymethod.into_iter" class="fn">into_iter</a>(self) -&gt; <a class="struct" href="struct.IterMut.html" title="struct http::header::IterMut">IterMut</a>&lt;'a, T&gt; <a href="#" class="tooltip" data-notable-ty="IterMut&lt;&#39;a, T&gt;">ⓘ</a></h4></section></summary><div class='docblock'>Creates an iterator from a value. <a href="https://doc.rust-lang.org/1.93.1/core/iter/traits/collect/trait.IntoIterator.html#tymethod.into_iter">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-IntoIterator-for-HeaderMap%3CT%3E" class="impl"><a class="src rightside" href="../../src/http/header/map.rs.html#1981-2041">Source</a><a href="#impl-IntoIterator-for-HeaderMap%3CT%3E" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/iter/traits/collect/trait.IntoIterator.html" title="trait core::iter::traits::collect::IntoIterator">IntoIterator</a> for <a class="struct" href="struct.HeaderMap.html" title="struct http::header::HeaderMap">HeaderMap</a>&lt;T&gt;</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.into_iter-2" class="method trait-impl"><a class="src rightside" href="../../src/http/header/map.rs.html#2034-2040">Source</a><a href="#method.into_iter-2" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/iter/traits/collect/trait.IntoIterator.html#tymethod.into_iter" class="fn">into_iter</a>(self) -&gt; <a class="struct" href="struct.IntoIter.html" title="struct http::header::IntoIter">IntoIter</a>&lt;T&gt; <a href="#" class="tooltip" data-notable-ty="IntoIter&lt;T&gt;">ⓘ</a></h4></section></summary><div class="docblock"><p>Creates a consuming iterator, that is, one that moves keys and values
out of the map in arbitrary order. The map cannot be used after calling
this.</p>
<p>For each yielded item that has <code>None</code> provided for the <code>HeaderName</code>,
then the associated header name is the same as that of the previously
yielded item. The first yielded item will have <code>HeaderName</code> set.</p>
<h5 id="examples-27"><a class="doc-anchor" href="#examples-27">§</a>Examples</h5>
<p>Basic usage.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>map = HeaderMap::new();
map.insert(header::CONTENT_LENGTH, <span class="string">"123"</span>.parse().unwrap());
map.insert(header::CONTENT_TYPE, <span class="string">"json"</span>.parse().unwrap());
<span class="kw">let </span><span class="kw-2">mut </span>iter = map.into_iter();
<span class="macro">assert_eq!</span>(iter.next(), <span class="prelude-val">Some</span>((<span class="prelude-val">Some</span>(header::CONTENT_LENGTH), <span class="string">"123"</span>.parse().unwrap())));
<span class="macro">assert_eq!</span>(iter.next(), <span class="prelude-val">Some</span>((<span class="prelude-val">Some</span>(header::CONTENT_TYPE), <span class="string">"json"</span>.parse().unwrap())));
<span class="macro">assert!</span>(iter.next().is_none());</code></pre></div>
<p>Multiple values per key.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>map = HeaderMap::new();
map.append(header::CONTENT_LENGTH, <span class="string">"123"</span>.parse().unwrap());
map.append(header::CONTENT_LENGTH, <span class="string">"456"</span>.parse().unwrap());
map.append(header::CONTENT_TYPE, <span class="string">"json"</span>.parse().unwrap());
map.append(header::CONTENT_TYPE, <span class="string">"html"</span>.parse().unwrap());
map.append(header::CONTENT_TYPE, <span class="string">"xml"</span>.parse().unwrap());
<span class="kw">let </span><span class="kw-2">mut </span>iter = map.into_iter();
<span class="macro">assert_eq!</span>(iter.next(), <span class="prelude-val">Some</span>((<span class="prelude-val">Some</span>(header::CONTENT_LENGTH), <span class="string">"123"</span>.parse().unwrap())));
<span class="macro">assert_eq!</span>(iter.next(), <span class="prelude-val">Some</span>((<span class="prelude-val">None</span>, <span class="string">"456"</span>.parse().unwrap())));
<span class="macro">assert_eq!</span>(iter.next(), <span class="prelude-val">Some</span>((<span class="prelude-val">Some</span>(header::CONTENT_TYPE), <span class="string">"json"</span>.parse().unwrap())));
<span class="macro">assert_eq!</span>(iter.next(), <span class="prelude-val">Some</span>((<span class="prelude-val">None</span>, <span class="string">"html"</span>.parse().unwrap())));
<span class="macro">assert_eq!</span>(iter.next(), <span class="prelude-val">Some</span>((<span class="prelude-val">None</span>, <span class="string">"xml"</span>.parse().unwrap())));
<span class="macro">assert!</span>(iter.next().is_none());</code></pre></div></div></details><details class="toggle" open><summary><section id="associatedtype.Item-2" class="associatedtype trait-impl"><a class="src rightside" href="../../src/http/header/map.rs.html#1982">Source</a><a href="#associatedtype.Item-2" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.93.1/core/iter/traits/collect/trait.IntoIterator.html#associatedtype.Item" class="associatedtype">Item</a> = (<a class="enum" href="https://doc.rust-lang.org/1.93.1/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="struct" href="struct.HeaderName.html" title="struct http::header::HeaderName">HeaderName</a>&gt;, T)</h4></section></summary><div class='docblock'>The type of the elements being iterated over.</div></details><details class="toggle" open><summary><section id="associatedtype.IntoIter-2" class="associatedtype trait-impl"><a class="src rightside" href="../../src/http/header/map.rs.html#1983">Source</a><a href="#associatedtype.IntoIter-2" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.93.1/core/iter/traits/collect/trait.IntoIterator.html#associatedtype.IntoIter" class="associatedtype">IntoIter</a> = <a class="struct" href="struct.IntoIter.html" title="struct http::header::IntoIter">IntoIter</a>&lt;T&gt;</h4></section></summary><div class='docblock'>Which kind of iterator are we turning this into?</div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-PartialEq-for-HeaderMap%3CT%3E" class="impl"><a class="src rightside" href="../../src/http/header/map.rs.html#2205-2214">Source</a><a href="#impl-PartialEq-for-HeaderMap%3CT%3E" class="anchor">§</a><h3 class="code-header">impl&lt;T: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/cmp/trait.PartialEq.html" title="trait core::cmp::PartialEq">PartialEq</a>&gt; <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/cmp/trait.PartialEq.html" title="trait core::cmp::PartialEq">PartialEq</a> for <a class="struct" href="struct.HeaderMap.html" title="struct http::header::HeaderMap">HeaderMap</a>&lt;T&gt;</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.eq" class="method trait-impl"><a class="src rightside" href="../../src/http/header/map.rs.html#2206-2213">Source</a><a href="#method.eq" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/cmp/trait.PartialEq.html#tymethod.eq" class="fn">eq</a>(&amp;self, other: &amp;<a class="struct" href="struct.HeaderMap.html" title="struct http::header::HeaderMap">HeaderMap</a>&lt;T&gt;) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.bool.html">bool</a></h4></section></summary><div class='docblock'>Tests for <code>self</code> and <code>other</code> values to be equal, and is used by <code>==</code>.</div></details><details class="toggle method-toggle" open><summary><section id="method.ne" class="method trait-impl"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/1.93.1/src/core/cmp.rs.html#264">Source</a></span><a href="#method.ne" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/cmp/trait.PartialEq.html#method.ne" class="fn">ne</a>(&amp;self, other: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.reference.html">&amp;Rhs</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.bool.html">bool</a></h4></section></summary><div class='docblock'>Tests for <code>!=</code>. The default implementation is almost always sufficient,
and should not be overridden without very good reason.</div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-TryFrom%3C%26HashMap%3CK,+V,+S%3E%3E-for-HeaderMap%3CT%3E" class="impl"><a class="src rightside" href="../../src/http/header/map.rs.html#2069-2088">Source</a><a href="#impl-TryFrom%3C%26HashMap%3CK,+V,+S%3E%3E-for-HeaderMap%3CT%3E" class="anchor">§</a><h3 class="code-header">impl&lt;'a, K, V, S, T&gt; <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;&amp;'a <a class="struct" href="https://doc.rust-lang.org/1.93.1/std/collections/hash/map/struct.HashMap.html" title="struct std::collections::hash::map::HashMap">HashMap</a>&lt;K, V, S&gt;&gt; for <a class="struct" href="struct.HeaderMap.html" title="struct http::header::HeaderMap">HeaderMap</a>&lt;T&gt;<div class="where">where
K: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a>,
<a class="struct" href="struct.HeaderName.html" title="struct http::header::HeaderName">HeaderName</a>: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.reference.html">&amp;'a K</a>&gt;,
&lt;<a class="struct" href="struct.HeaderName.html" title="struct http::header::HeaderName">HeaderName</a> as <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.reference.html">&amp;'a K</a>&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;<a class="struct" href="../struct.Error.html" title="struct http::Error">Error</a>&gt;,
T: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.reference.html">&amp;'a V</a>&gt;,
T::<a class="associatedtype" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;<a class="struct" href="../struct.Error.html" title="struct http::Error">Error</a>&gt;,</div></h3><div class="docblock"><p>Try to convert a <code>HashMap</code> into a <code>HeaderMap</code>.</p>
</div></section></summary><div class="docblock"><h4 id="examples-28"><a class="doc-anchor" href="#examples-28">§</a>Examples</h4>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>std::collections::HashMap;
<span class="kw">use </span>std::convert::TryInto;
<span class="kw">use </span>http::HeaderMap;
<span class="kw">let </span><span class="kw-2">mut </span>map = HashMap::new();
map.insert(<span class="string">"X-Custom-Header"</span>.to_string(), <span class="string">"my value"</span>.to_string());
<span class="kw">let </span>headers: HeaderMap = (<span class="kw-2">&amp;</span>map).try_into().expect(<span class="string">"valid headers"</span>);
<span class="macro">assert_eq!</span>(headers[<span class="string">"X-Custom-Header"</span>], <span class="string">"my value"</span>);</code></pre></div></div><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Error" class="associatedtype trait-impl"><a class="src rightside" href="../../src/http/header/map.rs.html#2077">Source</a><a href="#associatedtype.Error" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.93.1/core/convert/trait.TryFrom.html#associatedtype.Error" class="associatedtype">Error</a> = <a class="struct" href="../struct.Error.html" title="struct http::Error">Error</a></h4></section></summary><div class='docblock'>The type returned in the event of a conversion error.</div></details><details class="toggle method-toggle" open><summary><section id="method.try_from" class="method trait-impl"><a class="src rightside" href="../../src/http/header/map.rs.html#2079-2087">Source</a><a href="#method.try_from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/convert/trait.TryFrom.html#tymethod.try_from" class="fn">try_from</a>(c: &amp;'a <a class="struct" href="https://doc.rust-lang.org/1.93.1/std/collections/hash/map/struct.HashMap.html" title="struct std::collections::hash::map::HashMap">HashMap</a>&lt;K, V, S&gt;) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self, Self::<a class="associatedtype" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>&gt;</h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details><section id="impl-Eq-for-HeaderMap%3CT%3E" class="impl"><a class="src rightside" href="../../src/http/header/map.rs.html#2216">Source</a><a href="#impl-Eq-for-HeaderMap%3CT%3E" class="anchor">§</a><h3 class="code-header">impl&lt;T: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a>&gt; <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> for <a class="struct" href="struct.HeaderMap.html" title="struct http::header::HeaderMap">HeaderMap</a>&lt;T&gt;</h3></section></div><h2 id="synthetic-implementations" class="section-header">Auto Trait Implementations<a href="#synthetic-implementations" class="anchor">§</a></h2><div id="synthetic-implementations-list"><section id="impl-Freeze-for-HeaderMap%3CT%3E" class="impl"><a href="#impl-Freeze-for-HeaderMap%3CT%3E" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Freeze.html" title="trait core::marker::Freeze">Freeze</a> for <a class="struct" href="struct.HeaderMap.html" title="struct http::header::HeaderMap">HeaderMap</a>&lt;T&gt;</h3></section><section id="impl-RefUnwindSafe-for-HeaderMap%3CT%3E" class="impl"><a href="#impl-RefUnwindSafe-for-HeaderMap%3CT%3E" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a> for <a class="struct" href="struct.HeaderMap.html" title="struct http::header::HeaderMap">HeaderMap</a>&lt;T&gt;<div class="where">where
T: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a>,</div></h3></section><section id="impl-Send-for-HeaderMap%3CT%3E" class="impl"><a href="#impl-Send-for-HeaderMap%3CT%3E" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> for <a class="struct" href="struct.HeaderMap.html" title="struct http::header::HeaderMap">HeaderMap</a>&lt;T&gt;<div class="where">where
T: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>,</div></h3></section><section id="impl-Sync-for-HeaderMap%3CT%3E" class="impl"><a href="#impl-Sync-for-HeaderMap%3CT%3E" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="struct" href="struct.HeaderMap.html" title="struct http::header::HeaderMap">HeaderMap</a>&lt;T&gt;<div class="where">where
T: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a>,</div></h3></section><section id="impl-Unpin-for-HeaderMap%3CT%3E" class="impl"><a href="#impl-Unpin-for-HeaderMap%3CT%3E" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a> for <a class="struct" href="struct.HeaderMap.html" title="struct http::header::HeaderMap">HeaderMap</a>&lt;T&gt;<div class="where">where
T: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a>,</div></h3></section><section id="impl-UnwindSafe-for-HeaderMap%3CT%3E" class="impl"><a href="#impl-UnwindSafe-for-HeaderMap%3CT%3E" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/panic/unwind_safe/trait.UnwindSafe.html" title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a> for <a class="struct" href="struct.HeaderMap.html" title="struct http::header::HeaderMap">HeaderMap</a>&lt;T&gt;<div class="where">where
T: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/panic/unwind_safe/trait.UnwindSafe.html" title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a>,</div></h3></section></div><h2 id="blanket-implementations" class="section-header">Blanket Implementations<a href="#blanket-implementations" class="anchor">§</a></h2><div id="blanket-implementations-list"><details class="toggle implementors-toggle"><summary><section id="impl-Any-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/any.rs.html#138">Source</a><a href="#impl-Any-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/any/trait.Any.html" title="trait core::any::Any">Any</a> for T<div class="where">where
T: 'static + ?<a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.type_id" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/any.rs.html#139">Source</a><a href="#method.type_id" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/any/trait.Any.html#tymethod.type_id" class="fn">type_id</a>(&amp;self) -&gt; <a class="struct" href="https://doc.rust-lang.org/1.93.1/core/any/struct.TypeId.html" title="struct core::any::TypeId">TypeId</a></h4></section></summary><div class='docblock'>Gets the <code>TypeId</code> of <code>self</code>. <a href="https://doc.rust-lang.org/1.93.1/core/any/trait.Any.html#tymethod.type_id">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Borrow%3CT%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/borrow.rs.html#212">Source</a><a href="#impl-Borrow%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/borrow/trait.Borrow.html" title="trait core::borrow::Borrow">Borrow</a>&lt;T&gt; for T<div class="where">where
T: ?<a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.borrow" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/borrow.rs.html#214">Source</a><a href="#method.borrow" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/borrow/trait.Borrow.html#tymethod.borrow" class="fn">borrow</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.reference.html">&amp;T</a></h4></section></summary><div class='docblock'>Immutably borrows from an owned value. <a href="https://doc.rust-lang.org/1.93.1/core/borrow/trait.Borrow.html#tymethod.borrow">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-BorrowMut%3CT%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/borrow.rs.html#221">Source</a><a href="#impl-BorrowMut%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/borrow/trait.BorrowMut.html" title="trait core::borrow::BorrowMut">BorrowMut</a>&lt;T&gt; for T<div class="where">where
T: ?<a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.borrow_mut" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/borrow.rs.html#222">Source</a><a href="#method.borrow_mut" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut" class="fn">borrow_mut</a>(&amp;mut self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.reference.html">&amp;mut T</a></h4></section></summary><div class='docblock'>Mutably borrows from an owned value. <a href="https://doc.rust-lang.org/1.93.1/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-CloneToUninit-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/clone.rs.html#547">Source</a><a href="#impl-CloneToUninit-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/clone/trait.CloneToUninit.html" title="trait core::clone::CloneToUninit">CloneToUninit</a> for T<div class="where">where
T: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.clone_to_uninit" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/clone.rs.html#549">Source</a><a href="#method.clone_to_uninit" class="anchor">§</a><h4 class="code-header">unsafe fn <a href="https://doc.rust-lang.org/1.93.1/core/clone/trait.CloneToUninit.html#tymethod.clone_to_uninit" class="fn">clone_to_uninit</a>(&amp;self, dest: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.pointer.html">*mut </a><a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u8.html">u8</a>)</h4></section></summary><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>clone_to_uninit</code>)</span></div></span><div class='docblock'>Performs copy-assignment from <code>self</code> to <code>dest</code>. <a href="https://doc.rust-lang.org/1.93.1/core/clone/trait.CloneToUninit.html#tymethod.clone_to_uninit">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-From%3CT%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/convert/mod.rs.html#785">Source</a><a href="#impl-From%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;T&gt; for T</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.from" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/convert/mod.rs.html#788">Source</a><a href="#method.from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/convert/trait.From.html#tymethod.from" class="fn">from</a>(t: T) -&gt; T</h4></section></summary><div class="docblock"><p>Returns the argument unchanged.</p>
</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Into%3CU%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/convert/mod.rs.html#767-769">Source</a><a href="#impl-Into%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T, U&gt; <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;U&gt; for T<div class="where">where
U: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;T&gt;,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.into" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/convert/mod.rs.html#777">Source</a><a href="#method.into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/convert/trait.Into.html#tymethod.into" class="fn">into</a>(self) -&gt; U</h4></section></summary><div class="docblock"><p>Calls <code>U::from(self)</code>.</p>
<p>That is, this conversion is whatever the implementation of
<code><a href="https://doc.rust-lang.org/1.93.1/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;T&gt; for U</code> chooses to do.</p>
</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-ToOwned-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/alloc/borrow.rs.html#85-87">Source</a><a href="#impl-ToOwned-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.93.1/alloc/borrow/trait.ToOwned.html" title="trait alloc::borrow::ToOwned">ToOwned</a> for T<div class="where">where
T: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Owned" class="associatedtype trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/alloc/borrow.rs.html#89">Source</a><a href="#associatedtype.Owned" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.93.1/alloc/borrow/trait.ToOwned.html#associatedtype.Owned" class="associatedtype">Owned</a> = T</h4></section></summary><div class='docblock'>The resulting type after obtaining ownership.</div></details><details class="toggle method-toggle" open><summary><section id="method.to_owned" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/alloc/borrow.rs.html#90">Source</a><a href="#method.to_owned" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/alloc/borrow/trait.ToOwned.html#tymethod.to_owned" class="fn">to_owned</a>(&amp;self) -&gt; T</h4></section></summary><div class='docblock'>Creates owned data from borrowed data, usually by cloning. <a href="https://doc.rust-lang.org/1.93.1/alloc/borrow/trait.ToOwned.html#tymethod.to_owned">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.clone_into" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/alloc/borrow.rs.html#94">Source</a><a href="#method.clone_into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/alloc/borrow/trait.ToOwned.html#method.clone_into" class="fn">clone_into</a>(&amp;self, target: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.reference.html">&amp;mut T</a>)</h4></section></summary><div class='docblock'>Uses borrowed data to replace owned data, usually by cloning. <a href="https://doc.rust-lang.org/1.93.1/alloc/borrow/trait.ToOwned.html#method.clone_into">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-TryFrom%3CU%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/convert/mod.rs.html#827-829">Source</a><a href="#impl-TryFrom%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T, U&gt; <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;U&gt; for T<div class="where">where
U: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;T&gt;,</div></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Error-2" class="associatedtype trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/convert/mod.rs.html#831">Source</a><a href="#associatedtype.Error-2" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.93.1/core/convert/trait.TryFrom.html#associatedtype.Error" class="associatedtype">Error</a> = <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/convert/enum.Infallible.html" title="enum core::convert::Infallible">Infallible</a></h4></section></summary><div class='docblock'>The type returned in the event of a conversion error.</div></details><details class="toggle method-toggle" open><summary><section id="method.try_from-1" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/convert/mod.rs.html#834">Source</a><a href="#method.try_from-1" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/convert/trait.TryFrom.html#tymethod.try_from" class="fn">try_from</a>(value: U) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;T, &lt;T as <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;U&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>&gt;</h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-TryInto%3CU%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/convert/mod.rs.html#811-813">Source</a><a href="#impl-TryInto%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T, U&gt; <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.TryInto.html" title="trait core::convert::TryInto">TryInto</a>&lt;U&gt; for T<div class="where">where
U: <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;T&gt;,</div></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Error-1" class="associatedtype trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/convert/mod.rs.html#815">Source</a><a href="#associatedtype.Error-1" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.93.1/core/convert/trait.TryInto.html#associatedtype.Error" class="associatedtype">Error</a> = &lt;U as <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;T&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a></h4></section></summary><div class='docblock'>The type returned in the event of a conversion error.</div></details><details class="toggle method-toggle" open><summary><section id="method.try_into" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.93.1/src/core/convert/mod.rs.html#818">Source</a><a href="#method.try_into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.93.1/core/convert/trait.TryInto.html#tymethod.try_into" class="fn">try_into</a>(self) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.93.1/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;U, &lt;U as <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;T&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>&gt;</h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details></div><script type="text/json" id="notable-traits-data">{"Drain<'_, T>":"<h3>Notable traits for <code><a class=\"struct\" href=\"struct.Drain.html\" title=\"struct http::header::Drain\">Drain</a>&lt;'a, T&gt;</code></h3><pre><code><div class=\"where\">impl&lt;'a, T&gt; <a class=\"trait\" href=\"https://doc.rust-lang.org/1.93.1/core/iter/traits/iterator/trait.Iterator.html\" title=\"trait core::iter::traits::iterator::Iterator\">Iterator</a> for <a class=\"struct\" href=\"struct.Drain.html\" title=\"struct http::header::Drain\">Drain</a>&lt;'a, T&gt;</div><div class=\"where\"> type <a href=\"https://doc.rust-lang.org/1.93.1/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item\" class=\"associatedtype\">Item</a> = (<a class=\"enum\" href=\"https://doc.rust-lang.org/1.93.1/core/option/enum.Option.html\" title=\"enum core::option::Option\">Option</a>&lt;<a class=\"struct\" href=\"struct.HeaderName.html\" title=\"struct http::header::HeaderName\">HeaderName</a>&gt;, T);</div>","IntoIter<T>":"<h3>Notable traits for <code><a class=\"struct\" href=\"struct.IntoIter.html\" title=\"struct http::header::IntoIter\">IntoIter</a>&lt;T&gt;</code></h3><pre><code><div class=\"where\">impl&lt;T&gt; <a class=\"trait\" href=\"https://doc.rust-lang.org/1.93.1/core/iter/traits/iterator/trait.Iterator.html\" title=\"trait core::iter::traits::iterator::Iterator\">Iterator</a> for <a class=\"struct\" href=\"struct.IntoIter.html\" title=\"struct http::header::IntoIter\">IntoIter</a>&lt;T&gt;</div><div class=\"where\"> type <a href=\"https://doc.rust-lang.org/1.93.1/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item\" class=\"associatedtype\">Item</a> = (<a class=\"enum\" href=\"https://doc.rust-lang.org/1.93.1/core/option/enum.Option.html\" title=\"enum core::option::Option\">Option</a>&lt;<a class=\"struct\" href=\"struct.HeaderName.html\" title=\"struct http::header::HeaderName\">HeaderName</a>&gt;, T);</div>","Iter<'_, T>":"<h3>Notable traits for <code><a class=\"struct\" href=\"struct.Iter.html\" title=\"struct http::header::Iter\">Iter</a>&lt;'a, T&gt;</code></h3><pre><code><div class=\"where\">impl&lt;'a, T&gt; <a class=\"trait\" href=\"https://doc.rust-lang.org/1.93.1/core/iter/traits/iterator/trait.Iterator.html\" title=\"trait core::iter::traits::iterator::Iterator\">Iterator</a> for <a class=\"struct\" href=\"struct.Iter.html\" title=\"struct http::header::Iter\">Iter</a>&lt;'a, T&gt;</div><div class=\"where\"> type <a href=\"https://doc.rust-lang.org/1.93.1/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item\" class=\"associatedtype\">Item</a> = (&amp;'a <a class=\"struct\" href=\"struct.HeaderName.html\" title=\"struct http::header::HeaderName\">HeaderName</a>, <a class=\"primitive\" href=\"https://doc.rust-lang.org/1.93.1/std/primitive.reference.html\">&amp;'a T</a>);</div>","Iter<'a, T>":"<h3>Notable traits for <code><a class=\"struct\" href=\"struct.Iter.html\" title=\"struct http::header::Iter\">Iter</a>&lt;'a, T&gt;</code></h3><pre><code><div class=\"where\">impl&lt;'a, T&gt; <a class=\"trait\" href=\"https://doc.rust-lang.org/1.93.1/core/iter/traits/iterator/trait.Iterator.html\" title=\"trait core::iter::traits::iterator::Iterator\">Iterator</a> for <a class=\"struct\" href=\"struct.Iter.html\" title=\"struct http::header::Iter\">Iter</a>&lt;'a, T&gt;</div><div class=\"where\"> type <a href=\"https://doc.rust-lang.org/1.93.1/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item\" class=\"associatedtype\">Item</a> = (&amp;'a <a class=\"struct\" href=\"struct.HeaderName.html\" title=\"struct http::header::HeaderName\">HeaderName</a>, <a class=\"primitive\" href=\"https://doc.rust-lang.org/1.93.1/std/primitive.reference.html\">&amp;'a T</a>);</div>","IterMut<'_, T>":"<h3>Notable traits for <code><a class=\"struct\" href=\"struct.IterMut.html\" title=\"struct http::header::IterMut\">IterMut</a>&lt;'a, T&gt;</code></h3><pre><code><div class=\"where\">impl&lt;'a, T&gt; <a class=\"trait\" href=\"https://doc.rust-lang.org/1.93.1/core/iter/traits/iterator/trait.Iterator.html\" title=\"trait core::iter::traits::iterator::Iterator\">Iterator</a> for <a class=\"struct\" href=\"struct.IterMut.html\" title=\"struct http::header::IterMut\">IterMut</a>&lt;'a, T&gt;</div><div class=\"where\"> type <a href=\"https://doc.rust-lang.org/1.93.1/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item\" class=\"associatedtype\">Item</a> = (&amp;'a <a class=\"struct\" href=\"struct.HeaderName.html\" title=\"struct http::header::HeaderName\">HeaderName</a>, <a class=\"primitive\" href=\"https://doc.rust-lang.org/1.93.1/std/primitive.reference.html\">&amp;'a mut T</a>);</div>","IterMut<'a, T>":"<h3>Notable traits for <code><a class=\"struct\" href=\"struct.IterMut.html\" title=\"struct http::header::IterMut\">IterMut</a>&lt;'a, T&gt;</code></h3><pre><code><div class=\"where\">impl&lt;'a, T&gt; <a class=\"trait\" href=\"https://doc.rust-lang.org/1.93.1/core/iter/traits/iterator/trait.Iterator.html\" title=\"trait core::iter::traits::iterator::Iterator\">Iterator</a> for <a class=\"struct\" href=\"struct.IterMut.html\" title=\"struct http::header::IterMut\">IterMut</a>&lt;'a, T&gt;</div><div class=\"where\"> type <a href=\"https://doc.rust-lang.org/1.93.1/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item\" class=\"associatedtype\">Item</a> = (&amp;'a <a class=\"struct\" href=\"struct.HeaderName.html\" title=\"struct http::header::HeaderName\">HeaderName</a>, <a class=\"primitive\" href=\"https://doc.rust-lang.org/1.93.1/std/primitive.reference.html\">&amp;'a mut T</a>);</div>","Keys<'_, T>":"<h3>Notable traits for <code><a class=\"struct\" href=\"struct.Keys.html\" title=\"struct http::header::Keys\">Keys</a>&lt;'a, T&gt;</code></h3><pre><code><div class=\"where\">impl&lt;'a, T&gt; <a class=\"trait\" href=\"https://doc.rust-lang.org/1.93.1/core/iter/traits/iterator/trait.Iterator.html\" title=\"trait core::iter::traits::iterator::Iterator\">Iterator</a> for <a class=\"struct\" href=\"struct.Keys.html\" title=\"struct http::header::Keys\">Keys</a>&lt;'a, T&gt;</div><div class=\"where\"> type <a href=\"https://doc.rust-lang.org/1.93.1/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item\" class=\"associatedtype\">Item</a> = &amp;'a <a class=\"struct\" href=\"struct.HeaderName.html\" title=\"struct http::header::HeaderName\">HeaderName</a>;</div>","Values<'_, T>":"<h3>Notable traits for <code><a class=\"struct\" href=\"struct.Values.html\" title=\"struct http::header::Values\">Values</a>&lt;'a, T&gt;</code></h3><pre><code><div class=\"where\">impl&lt;'a, T&gt; <a class=\"trait\" href=\"https://doc.rust-lang.org/1.93.1/core/iter/traits/iterator/trait.Iterator.html\" title=\"trait core::iter::traits::iterator::Iterator\">Iterator</a> for <a class=\"struct\" href=\"struct.Values.html\" title=\"struct http::header::Values\">Values</a>&lt;'a, T&gt;</div><div class=\"where\"> type <a href=\"https://doc.rust-lang.org/1.93.1/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item\" class=\"associatedtype\">Item</a> = <a class=\"primitive\" href=\"https://doc.rust-lang.org/1.93.1/std/primitive.reference.html\">&amp;'a T</a>;</div>","ValuesMut<'_, T>":"<h3>Notable traits for <code><a class=\"struct\" href=\"struct.ValuesMut.html\" title=\"struct http::header::ValuesMut\">ValuesMut</a>&lt;'a, T&gt;</code></h3><pre><code><div class=\"where\">impl&lt;'a, T&gt; <a class=\"trait\" href=\"https://doc.rust-lang.org/1.93.1/core/iter/traits/iterator/trait.Iterator.html\" title=\"trait core::iter::traits::iterator::Iterator\">Iterator</a> for <a class=\"struct\" href=\"struct.ValuesMut.html\" title=\"struct http::header::ValuesMut\">ValuesMut</a>&lt;'a, T&gt;</div><div class=\"where\"> type <a href=\"https://doc.rust-lang.org/1.93.1/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item\" class=\"associatedtype\">Item</a> = <a class=\"primitive\" href=\"https://doc.rust-lang.org/1.93.1/std/primitive.reference.html\">&amp;'a mut T</a>;</div>"}</script></section></div></main></body></html>
Reference in New Issue View Git Blame Copy Permalink