160 lines
7.8 KiB
HTML
160 lines
7.8 KiB
HTML
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<meta name="generator" content="rustdoc">
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<meta name="description" content="API documentation for the Rust `IfRange` enum in crate `hyper`.">
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<meta name="keywords" content="rust, rustlang, rust-lang, IfRange">
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<title>hyper::header::IfRange - Rust</title>
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<link rel="stylesheet" type="text/css" href="../../rustdoc.css">
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<link rel="stylesheet" type="text/css" href="../../main.css">
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</head>
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<body class="rustdoc">
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<!--[if lte IE 8]>
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<div class="warning">
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This old browser is unsupported and will most likely display funky
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things.
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</div>
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<![endif]-->
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<nav class="sidebar">
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<p class='location'><a href='../index.html'>hyper</a>::<wbr><a href='index.html'>header</a></p><script>window.sidebarCurrent = {name: 'IfRange', ty: 'enum', relpath: ''};</script><script defer src="sidebar-items.js"></script>
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</nav>
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<nav class="sub">
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<form class="search-form js-only">
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<div class="search-container">
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<input class="search-input" name="search"
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autocomplete="off"
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placeholder="Click or press ‘S’ to search, ‘?’ for more options…"
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type="search">
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</div>
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</form>
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</nav>
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<section id='main' class="content enum">
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<h1 class='fqn'><span class='in-band'>Enum <a href='../index.html'>hyper</a>::<wbr><a href='index.html'>header</a>::<wbr><a class='enum' href=''>IfRange</a></span><span class='out-of-band'><span id='render-detail'>
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<a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">
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[<span class='inner'>−</span>]
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</a>
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</span><a id='src-3369' class='srclink' href='../../src/hyper/header/common/if_range.rs.html#49-54' title='goto source code'>[src]</a></span></h1>
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<pre class='rust enum'>pub enum IfRange {
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EntityTag(<a class='struct' href='../../hyper/header/struct.EntityTag.html' title='hyper::header::EntityTag'>EntityTag</a>),
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Date(<a class='struct' href='../../hyper/header/struct.HttpDate.html' title='hyper::header::HttpDate'>HttpDate</a>),
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}</pre><div class='docblock'><p><code>If-Range</code> header, defined in <a href="http://tools.ietf.org/html/rfc7233#section-3.2">RFC7233</a></p>
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<p>If a client has a partial copy of a representation and wishes to have
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an up-to-date copy of the entire representation, it could use the
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Range header field with a conditional GET (using either or both of
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If-Unmodified-Since and If-Match.) However, if the precondition
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fails because the representation has been modified, the client would
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then have to make a second request to obtain the entire current
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representation.</p>
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<p>The <code>If-Range</code> header field allows a client to "short-circuit" the
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second request. Informally, its meaning is as follows: if the
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representation is unchanged, send me the part(s) that I am requesting
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in Range; otherwise, send me the entire representation.</p>
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<h1 id='abnf' class='section-header'><a href='#abnf'>ABNF</a></h1>
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<pre><code class="language-plain">If-Range = entity-tag / HTTP-date
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</code></pre>
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<h1 id='example-values' class='section-header'><a href='#example-values'>Example values</a></h1>
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<ul>
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<li><code>Sat, 29 Oct 1994 19:43:31 GMT</code></li>
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<li><code>\"xyzzy\"</code></li>
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</ul>
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<h1 id='examples' class='section-header'><a href='#examples'>Examples</a></h1>
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<pre class='rust rust-example-rendered'>
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<span class='kw'>use</span> <span class='ident'>hyper</span>::<span class='ident'>header</span>::{<span class='ident'>Headers</span>, <span class='ident'>IfRange</span>, <span class='ident'>EntityTag</span>};
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<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>headers</span> <span class='op'>=</span> <span class='ident'>Headers</span>::<span class='ident'>new</span>();
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<span class='ident'>headers</span>.<span class='ident'>set</span>(<span class='ident'>IfRange</span>::<span class='ident'>EntityTag</span>(<span class='ident'>EntityTag</span>::<span class='ident'>new</span>(<span class='bool-val'>false</span>, <span class='string'>"xyzzy"</span>.<span class='ident'>to_owned</span>())));</pre>
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<pre class='rust rust-example-rendered'>
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<span class='comment'>// extern crate time;</span>
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<span class='kw'>use</span> <span class='ident'>hyper</span>::<span class='ident'>header</span>::{<span class='ident'>Headers</span>, <span class='ident'>IfRange</span>, <span class='ident'>HttpDate</span>};
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<span class='kw'>use</span> <span class='ident'>time</span>::{<span class='self'>self</span>, <span class='ident'>Duration</span>};
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<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>headers</span> <span class='op'>=</span> <span class='ident'>Headers</span>::<span class='ident'>new</span>();
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<span class='ident'>headers</span>.<span class='ident'>set</span>(<span class='ident'>IfRange</span>::<span class='ident'>Date</span>(<span class='ident'>HttpDate</span>(<span class='ident'>time</span>::<span class='ident'>now</span>() <span class='op'>-</span> <span class='ident'>Duration</span>::<span class='ident'>days</span>(<span class='number'>1</span>))));</pre>
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</div><h2 class='variants'>Variants</h2>
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<span id='variant.EntityTag' class='variant'><code>EntityTag(<a class='struct' href='../../hyper/header/struct.EntityTag.html' title='hyper::header::EntityTag'>EntityTag</a>)</code></span><div class='docblock'><p>The entity-tag the client has of the resource</p>
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</div><span id='variant.Date' class='variant'><code>Date(<a class='struct' href='../../hyper/header/struct.HttpDate.html' title='hyper::header::HttpDate'>HttpDate</a>)</code></span><div class='docblock'><p>The date when the client retrieved the resource</p>
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</div></section>
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<section id='search' class="content hidden"></section>
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<section class="footer"></section>
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<aside id="help" class="hidden">
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<div>
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<h1 class="hidden">Help</h1>
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<div class="shortcuts">
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<h2>Keyboard Shortcuts</h2>
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<dl>
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<dt>?</dt>
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<dd>Show this help dialog</dd>
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<dt>S</dt>
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<dd>Focus the search field</dd>
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<dt>⇤</dt>
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<dd>Move up in search results</dd>
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<dt>⇥</dt>
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<dd>Move down in search results</dd>
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<dt>⏎</dt>
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<dd>Go to active search result</dd>
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<dd>Collapse/expand all sections</dd>
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</dl>
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</div>
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<div class="infos">
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<h2>Search Tricks</h2>
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<p>
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Prefix searches with a type followed by a colon (e.g.
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<code>fn:</code>) to restrict the search to a given type.
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</p>
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<p>
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Accepted types are: <code>fn</code>, <code>mod</code>,
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<code>struct</code>, <code>enum</code>,
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<code>trait</code>, <code>type</code>, <code>macro</code>,
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and <code>const</code>.
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</p>
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<p>
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Search functions by type signature (e.g.
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<code>vec -> usize</code> or <code>* -> vec</code>)
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</p>
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</div>
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</div>
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</aside>
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<script>
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window.rootPath = "../../";
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window.currentCrate = "hyper";
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window.playgroundUrl = "";
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</script>
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<script src="../../jquery.js"></script>
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</body>
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</html>
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