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<h1 class="lined-header"><span>cowboy_router(3)</span></h1>
<div class="sect1">
<h2 id="_name">Name</h2>
<div class="sectionbody">
<div class="paragraph"><p>cowboy_router - Router middleware</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_description">Description</h2>
<div class="sectionbody">
<div class="paragraph"><p>The <code>cowboy_router</code> middleware maps the requested host and
path to the handler to be used for processing the request.</p></div>
<div class="paragraph"><p>The router takes the <code>dispatch</code> rules as input from the
middleware environment. Dispatch rules are generated by
calling the
<a href="../cowboy_router.compile">cowboy_router:compile(3)</a>
function.</p></div>
<div class="paragraph"><p>When a route matches, the router sets the <code>handler</code> and
<code>handler_opts</code> middleware environment values containing
the handler module and initial state, respectively.</p></div>
<div class="paragraph"><p>The router will stop execution when no route matches.
It will send a 400 response if no host was found, and
a 404 response otherwise.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_exports">Exports</h2>
<div class="sectionbody">
<div class="ulist"><ul>
<li>
<p>
<a href="../cowboy_router.compile">cowboy_router:compile(3)</a> - Compile routes to the resources
</p>
</li>
</ul></div>
</div>
</div>
<div class="sect1">
<h2 id="_types">Types</h2>
<div class="sectionbody">
<div class="sect2">
<h3 id="_bindings">bindings()</h3>
<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><span style="font-weight: bold"><span style="color: #000000">bindings</span></span>() <span style="color: #990000">::</span> [{<span style="font-weight: bold"><span style="color: #000080">atom</span></span>(), <span style="font-weight: bold"><span style="color: #000080">binary</span></span>()}]</tt></pre></div></div>
<div class="paragraph"><p>Bindings found during routing.</p></div>
</div>
<div class="sect2">
<h3 id="_dispatch_rules">dispatch_rules()</h3>
<div class="paragraph"><p>Opaque type containing the compiled routes.</p></div>
</div>
<div class="sect2">
<h3 id="_routes">routes()</h3>
<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><span style="font-weight: bold"><span style="color: #000000">routes</span></span>() <span style="color: #990000">=</span> [
{<span style="color: #009900">Host</span>, <span style="color: #009900">PathList</span>} |
{<span style="color: #009900">Host</span>, <span style="color: #009900">Fields</span>, <span style="color: #009900">PathList</span>}
]
<span style="color: #009900">PathList</span> <span style="color: #990000">::</span> [
{<span style="color: #009900">Path</span>, <span style="color: #009900">Handler</span>, <span style="color: #009900">InitialState</span>} |
{<span style="color: #009900">Path</span>, <span style="color: #009900">Fields</span>, <span style="color: #009900">Handler</span>, <span style="color: #009900">InitialState</span>}
]
<span style="color: #009900">Host</span> <span style="color: #990000">::</span> <span style="color: #FF6600">'_'</span> | <span style="font-weight: bold"><span style="color: #000000">iodata</span></span>()
<span style="color: #009900">Path</span> <span style="color: #990000">::</span> <span style="color: #FF6600">'_'</span> | <span style="font-weight: bold"><span style="color: #000000">iodata</span></span>()
<span style="color: #009900">Fields</span> <span style="color: #990000">::</span> <span style="font-weight: bold"><span style="color: #000000">cowboy:fields</span></span>()
<span style="color: #009900">Handler</span> <span style="color: #990000">::</span> <span style="font-weight: bold"><span style="color: #000000">module</span></span>()
<span style="color: #009900">InitialState</span> <span style="color: #990000">::</span> <span style="font-weight: bold"><span style="color: #000000">any</span></span>()</tt></pre></div></div>
<div class="paragraph"><p>Human readable list of routes to handlers.</p></div>
<div class="paragraph"><p>Cowboy uses this list to map hosts and paths, optionally
augmented with constraints applied to the bindings, to
handler modules.</p></div>
<div class="paragraph"><p>The syntax for routes is currently defined in the user guide.</p></div>
</div>
<div class="sect2">
<h3 id="_tokens">tokens()</h3>
<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><span style="font-weight: bold"><span style="color: #000000">tokens</span></span>() <span style="color: #990000">::</span> [<span style="font-weight: bold"><span style="color: #000080">binary</span></span>()]</tt></pre></div></div>
<div class="paragraph"><p>List of <code>host_info</code> and <code>path_info</code> tokens that were found
using the <code>...</code> syntax.</p></div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_see_also">See also</h2>
<div class="sectionbody">
<div class="paragraph"><p><a href="..">cowboy(7)</a>,
<a href="../cowboy_req.binding">cowboy_req:binding(3)</a>,
<a href="../cowboy_req.bindings">cowboy_req:bindings(3)</a>,
<a href="../cowboy_req.host_info">cowboy_req:host_info(3)</a>,
<a href="../cowboy_req.path_info">cowboy_req:path_info(3)</a></p></div>
</div>
</div>
</div>
<div class="span3 sidecol">
<h3>
Cowboy
2.0
Function Reference
</h3>
<ul>
<li><a href="/docs/en/cowboy/2.0/guide">User Guide</a></li>
<li><a href="/docs/en/cowboy/2.0/manual">Function Reference</a></li>
</ul>
<h4 id="docs-nav">Navigation</h4>
<h4>Version select</h4>
<ul>
<li><a href="/docs/en/cowboy/1.0/manual">1.0</a></li>
<li><a href="/docs/en/cowboy/2.0/manual">2.0</a></li>
</ul>
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