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<h1 class="lined-header"><span>cowboy_req:cert(3)</span></h1>
<h2 id="_name">Name</h2>
<p>cowboy_req:cert - Client TLS certificate</p>
<h2 id="_description">Description</h2>
<div class="listingblock"><div class="content"><!-- Generator: GNU source-highlight 3.1.9
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt><b><font color="#000000">cert</font></b>(<font color="#009900">Req</font> <font color="#990000">::</font> <b><font color="#000000">cowboy_req:req</font></b>()) <font color="#990000">-></font> <b><font color="#000080">binary</font></b>() | <font color="#000080">undefined</font></tt></pre>
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<p>Return the peer's TLS certificate.</p>
<p>Using the default configuration this function will always return <code>undefined</code>. You need to explicitly configure Cowboy to request the client certificate. To do this you need to set the <code>verify</code> transport option to <code>verify_peer</code>:</p>
<div class="listingblock"><div class="content"><!-- Generator: GNU source-highlight 3.1.9
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt>{<font color="#FF6600">ok</font>, <font color="#990000">_</font>} <font color="#990000">=</font> <b><font color="#000000">cowboy:start_tls</font></b>(<font color="#FF6600">example</font>, [
{<font color="#FF6600">port</font>, <font color="#993399">8443</font>},
{<font color="#FF6600">certfile</font>, <font color="#FF0000">"path/to/cert.pem"</font>},
{<font color="#FF6600">verify</font>, <font color="#FF6600">verify_peer</font>}
], #{
<font color="#0000FF">env</font> <font color="#990000">=></font> #{<font color="#0000FF">dispatch</font> <font color="#990000">=></font> <font color="#009900">Dispatch</font>}
})<font color="#990000">.</font></tt></pre>
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<p>You may also want to customize the <code>verify_fun</code> function. Please consult the <code>ssl</code> application's manual for more details.</p>
<p>TCP connections do not allow a certificate and this function will therefore always return <code>undefined</code>.</p>
<p>The certificate can also be obtained using pattern matching:</p>
<div class="listingblock"><div class="content"><!-- Generator: GNU source-highlight 3.1.9
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt>#{<font color="#FF6600">cert</font> <font color="#990000">:=</font> <font color="#009900">Cert</font>} <font color="#990000">=</font> <font color="#009900">Req</font><font color="#990000">.</font></tt></pre>
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<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 client TLS certificate.</p>
<h2 id="_changelog">Changelog</h2>
<ul><li><strong>2.1</strong>: Function introduced.
</li>
</ul>
<h2 id="_examples">Examples</h2>
<div class="listingblock"><div class="title">Get the client TLS certificate.</div>
<div class="content"><!-- Generator: GNU source-highlight 3.1.9
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt><font color="#009900">Cert</font> <font color="#990000">=</font> <b><font color="#000000">cowboy_req:cert</font></b>(<font color="#009900">Req</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>, <a href="../cowboy_req.peer">cowboy_req:peer(3)</a>, <a href="../cowboy_req.sock">cowboy_req:sock(3)</a></p>
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<h3>
Cowboy
2.11
Function Reference
</h3>
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<li><a href="/docs/en/cowboy/2.11/guide">User Guide</a></li>
<li><a href="/docs/en/cowboy/2.11/manual">Function Reference</a></li>
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<li><a href="/docs/en/cowboy/2.9/manual">2.9</a></li>
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