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<h1 class='fqn'><span class='in-band'>Struct <a href='../index.html'>hyper</a>::<wbr><a href='index.html'>header</a>::<wbr><a class='struct' href=''>IfUnmodifiedSince</a></span><span class='out-of-band'><span id='render-detail'>
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<pre class='rust struct'>pub struct IfUnmodifiedSince(pub <a class='struct' href='../../hyper/header/struct.HttpDate.html' title='hyper::header::HttpDate'>HttpDate</a>);</pre><div class='docblock'><p><code>If-Unmodified-Since</code> header, defined in
<a href="http://tools.ietf.org/html/rfc7232#section-3.4">RFC7232</a></p>
<p>The <code>If-Unmodified-Since</code> header field makes the request method
conditional on the selected representation's last modification date
being earlier than or equal to the date provided in the field-value.
This field accomplishes the same purpose as If-Match for cases where
the user agent does not have an entity-tag for the representation.</p>
<h1 id='abnf' class='section-header'><a href='#abnf'>ABNF</a></h1>
<pre><code class="language-plain">If-Unmodified-Since = HTTP-date
</code></pre>
<h1 id='example-values' class='section-header'><a href='#example-values'>Example values</a></h1>
<ul>
<li><code>Sat, 29 Oct 1994 19:43:31 GMT</code></li>
</ul>
<h1 id='example' class='section-header'><a href='#example'>Example</a></h1>
<pre class='rust rust-example-rendered'>
<span class='comment'>// extern crate time;</span>
<span class='kw'>use</span> <span class='ident'>hyper</span>::<span class='ident'>header</span>::{<span class='ident'>Headers</span>, <span class='ident'>IfUnmodifiedSince</span>, <span class='ident'>HttpDate</span>};
<span class='kw'>use</span> <span class='ident'>time</span>::{<span class='self'>self</span>, <span class='ident'>Duration</span>};
<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>();
<span class='ident'>headers</span>.<span class='ident'>set</span>(<span class='ident'>IfUnmodifiedSince</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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