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<h1 class="lined-header"><span>cowboy_req:peer(3)</span></h1>
<h2 id="_name">Name</h2>
<p>cowboy_req:peer - Peer address and port</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">peer</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">Info</font>
<font color="#009900">Info</font> <font color="#990000">::</font> {<b><font color="#000000">inet:ip_address</font></b>(), <b><font color="#000000">inet:port_number</font></b>()}</tt></pre>
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<p>Return the peer's IP address and port number.</p>
<p>The peer information 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">peer</font> <font color="#990000">:=</font> {<font color="#009900">IP</font>, <font color="#009900">Port</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 peer's IP address and port number.</p>
<p>The peer is not necessarily the client's IP address and port. It is the IP address of the endpoint connecting directly to the server, which may be a gateway or a proxy.</p>
<p>The forwarded header can be used to get better information about the different endpoints from the client to the server. Note however that it is only informative; there is no reliable way of determining the source of an HTTP request.</p>
<h2 id="_changelog">Changelog</h2>
<ul><li><strong>2.0</strong>: Only the peer is returned, it is no longer wrapped in a tuple.
</li>
<li><strong>1.0</strong>: Function introduced.
</li>
</ul>
<h2 id="_examples">Examples</h2>
<div class="listingblock"><div class="title">Get the peer IP address and port number.</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">IP</font>, <font color="#009900">Port</font>} <font color="#990000">=</font> <b><font color="#000000">cowboy_req:peer</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.sock">cowboy_req:sock(3)</a>, <a href="../cowboy_req.cert">cowboy_req:cert(3)</a></p>
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