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<title>Nine Nines: cowboy_req:scheme(3)</title>
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<h1 class="lined-header"><span>cowboy_req:scheme(3)</span></h1>
<h2 id="_name">Name</h2>
<p>cowboy_req:scheme - URI scheme</p>
<h2 id="_description">Description</h2>
<div class="listingblock"><div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt><b><font color="#000000">scheme</font></b>(<font color="#009900">Req</font> <font color="#990000">::</font> <b><font color="#000000">cowboy_req:req</font></b>()) <font color="#990000">-></font> <font color="#009900">Scheme</font> <font color="#990000">::</font> <b><font color="#000080">binary</font></b>()</tt></pre>
</div></div>
<p>Return the scheme of the effective request URI.</p>
<p>The scheme can also be obtained using pattern matching:</p>
<div class="listingblock"><div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt>#{<font color="#FF6600">scheme</font> <font color="#990000">:=</font> <font color="#009900">Scheme</font>} <font color="#990000">=</font> <font color="#009900">Req</font><font color="#990000">.</font></tt></pre>
</div></div>
<h2 id="_arguments">Arguments</h2>
<dl><dt>Req</dt>
<dd><p>The Req object.</p>
</dd>
</dl>
<h2 id="_return_value">Return value</h2>
<p>The scheme is returned as a binary. It is case insensitive.</p>
<p>Cowboy will only set the scheme to <code><<"http">></code> or <code><<"https">></code>.</p>
<h2 id="_changelog">Changelog</h2>
<ul><li><strong>2.0</strong>: Function introduced.
</li>
</ul>
<h2 id="_examples">Examples</h2>
<div class="listingblock"><div class="title">Redirect HTTP to HTTPS</div>
<div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt><b><font color="#000000">init</font></b>(<font color="#009900">Req0</font><font color="#990000">=</font>#{<font color="#FF6600">scheme</font> <font color="#990000">:=</font> <font color="#990000"><<</font><font color="#FF0000">"http"</font><font color="#990000">>></font>}, <font color="#009900">State</font>) <font color="#990000">-></font>
<font color="#009900">Req</font> <font color="#990000">=</font> <b><font color="#000000">cowboy_req:reply</font></b>(<font color="#993399">302</font>, #{
<font color="#990000"><<</font><font color="#FF0000">"location"</font><font color="#990000">>></font> <font color="#990000">=></font> <b><font color="#000000">cowboy_req:uri</font></b>(<font color="#009900">Req</font>, #{<font color="#0000FF">scheme</font> <font color="#990000">=></font> <font color="#990000"><<</font><font color="#FF0000">"https"</font><font color="#990000">>></font>})
}, <font color="#009900">Req0</font>),
{<font color="#FF6600">ok</font>, <font color="#009900">Req</font>, <font color="#009900">State</font>};
<b><font color="#000000">init</font></b>(<font color="#009900">Req</font>, <font color="#009900">State</font>) <font color="#990000">-></font>
{<font color="#FF6600">cowboy_rest</font>, <font color="#009900">Req</font>, <font color="#009900">State</font>}<font color="#990000">.</font></tt></pre>
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<h2 id="_see_also">See also</h2>
<p><a href="../cowboy_req">cowboy_req(3)</a></p>
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