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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="API documentation for the Rust `IF_MODIFIED_SINCE` constant in crate `http`."><meta name="keywords" content="rust, rustlang, rust-lang, IF_MODIFIED_SINCE"><title>http::header::IF_MODIFIED_SINCE - Rust</title><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled ><script id="default-settings"></script><script src="../../storage.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../../favicon.svg">
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<link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><style type="text/css">#crate-search{background-image:url("../../down-arrow.svg");}</style></head><body class="rustdoc constant"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a href='../../http/index.html'><div class='logo-container rust-logo'><img src='../../rust-logo.png' alt='logo'></div></a><div class="sidebar-elems"><p class="location"><a href="../index.html">http</a>::<wbr><a href="index.html">header</a></p><div id="sidebar-vars" data-name="IF_MODIFIED_SINCE" data-ty="constant" data-relpath=""></div><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu"><img src="../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices" role="menu"></div></div><script src="../../theme.js"></script><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" disabled autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" class="help-button">?</button>
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<a id="settings-menu" href="../../settings.html"><img src="../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class="fqn"><span class="in-band">Constant <a href="../index.html">http</a>::<wbr><a href="index.html">header</a>::<wbr><a class="constant" href="">IF_MODIFIED_SINCE</a></span><span class="out-of-band"><span id="render-detail"><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">−</span>]</a></span><a class="srclink" href="../../src/http/header/name.rs.html#146-965" title="goto source code">[src]</a></span></h1><pre class="rust const">pub const IF_MODIFIED_SINCE: <a class="struct" href="../../http/header/struct.HeaderName.html" title="struct http::header::HeaderName">HeaderName</a>;</pre><div class="docblock"><p>Makes a request conditional based on the modification date.</p>
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<p>The If-Modified-Since request HTTP header makes the request conditional:
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the server will send back the requested resource, with a 200 status,
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only if it has been last modified after the given date. If the request
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has not been modified since, the response will be a 304 without any
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body; the Last-Modified header will contain the date of last
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modification. Unlike If-Unmodified-Since, If-Modified-Since can only be
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used with a GET or HEAD.</p>
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<p>When used in combination with If-None-Match, it is ignored, unless the
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server doesn't support If-None-Match.</p>
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<p>The most common use case is to update a cached entity that has no
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associated ETag.</p>
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