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<title>Nine Nines: cowboy_router(3)</title>
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<h1 class="lined-header"><span>cowboy_router(3)</span></h1>
<h2 id="_name">Name</h2>
<p>cowboy_router - Router middleware</p>
<h2 id="_description">Description</h2>
<p>The <code>cowboy_router</code> middleware maps the requested host and path to the handler to be used for processing the request.</p>
<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. The environment can contain the rules directly or a tuple <code>{persistent_term, Key}</code>, in which case Cowboy will call <code>persistent_term:get(Key)</code> to retrieve the dispatch rules.</p>
<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>
<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>
<h2 id="_exports">Exports</h2>
<ul><li><a href="../cowboy_router.compile">cowboy_router:compile(3)</a> - Compile routes to the resources
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<h2 id="_types">Types</h2>
<h3 id="_bindings">bindings()</h3>
<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">bindings</font></b>() <font color="#990000">::</font> #{<b><font color="#000080">atom</font></b>() <font color="#990000">=></font> <b><font color="#000000">any</font></b>()}</tt></pre>
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<p>Bindings found during routing.</p>
<h3 id="_dispatch_rules">dispatch_rules()</h3>
<p>Opaque type containing the compiled routes.</p>
<h3 id="_routes">routes()</h3>
<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">routes</font></b>() <font color="#990000">=</font> [
{<font color="#009900">Host</font>, <font color="#009900">PathList</font>} |
{<font color="#009900">Host</font>, <font color="#009900">Fields</font>, <font color="#009900">PathList</font>}
]
<font color="#009900">PathList</font> <font color="#990000">::</font> [
{<font color="#009900">Path</font>, <font color="#009900">Handler</font>, <font color="#009900">InitialState</font>} |
{<font color="#009900">Path</font>, <font color="#009900">Fields</font>, <font color="#009900">Handler</font>, <font color="#009900">InitialState</font>}
]
<font color="#009900">Host</font> <font color="#990000">::</font> <font color="#FF6600">'_'</font> | <b><font color="#000000">iodata</font></b>()
<font color="#009900">Path</font> <font color="#990000">::</font> <font color="#FF6600">'_'</font> | <b><font color="#000000">iodata</font></b>()
<font color="#009900">Fields</font> <font color="#990000">::</font> <b><font color="#000000">cowboy:fields</font></b>()
<font color="#009900">Handler</font> <font color="#990000">::</font> <b><font color="#000000">module</font></b>()
<font color="#009900">InitialState</font> <font color="#990000">::</font> <b><font color="#000000">any</font></b>()</tt></pre>
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<p>Human readable list of routes to handlers.</p>
<p>Cowboy uses this list to map hosts and paths, optionally augmented with constraints applied to the bindings, to handler modules.</p>
<p>The syntax for routes is currently defined in the user guide.</p>
<!-- @todo The syntax should probably be in this module,-->
<!-- and the user guide show more practical examples.-->
<h3 id="_tokens">tokens()</h3>
<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">tokens</font></b>() <font color="#990000">::</font> [<b><font color="#000080">binary</font></b>()]</tt></pre>
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<p>List of <code>host_info</code> and <code>path_info</code> tokens that were found using the <code>...</code> syntax.</p>
<h2 id="_see_also">See also</h2>
<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>
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