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+<h1 class="lined-header"><span>cowboy_constraints(3)</span></h1>
+
+<div class="sect1">
+<h2 id="_name">Name</h2>
+<div class="sectionbody">
+<div class="paragraph"><p>cowboy_constraints - Constraints</p></div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="_description">Description</h2>
+<div class="sectionbody">
+<div class="paragraph"><p>The module <code>cowboy_constraints</code> defines the built-in
+constraints in Cowboy and provides an interface for
+manipulating these constraints.</p></div>
+<div class="paragraph"><p>Constraints are functions that define what type of
+input is allowed. They are used throughout Cowboy,
+from the router to query strings to cookies.</p></div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="_exports">Exports</h2>
+<div class="sectionbody">
+<div class="paragraph"><p>Built-in constraints:</p></div>
+<div class="ulist"><ul>
+<li>
+<p>
+<a href="../cowboy_constraints.int">cowboy_constraints:int(3)</a> - Integer constraint
+</p>
+</li>
+<li>
+<p>
+<a href="../cowboy_constraints.nonempty">cowboy_constraints:nonempty(3)</a> - Non-empty constraint
+</p>
+</li>
+</ul></div>
+</div>
+</div>
+<div class="sect1">
+<h2 id="_types">Types</h2>
+<div class="sectionbody">
+<div class="sect2">
+<h3 id="_constraint">constraint()</h3>
+<div class="listingblock">
+<div class="content"><!-- Generator: GNU source-highlight
+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">constraint</span></span>() <span style="color: #990000">::</span> <span style="color: #FF6600">int</span> | <span style="color: #FF6600">nonempty</span> | <span style="font-weight: bold"><span style="color: #0000FF">fun</span></span>()</tt></pre></div></div>
+<div class="paragraph"><p>A constraint function.</p></div>
+<div class="paragraph"><p>The atom constraints are built-in, see the corresponding
+function in the exports list above.</p></div>
+</div>
+<div class="sect2">
+<h3 id="_reason">reason()</h3>
+<div class="listingblock">
+<div class="content"><!-- Generator: GNU source-highlight
+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">reason</span></span>() <span style="color: #990000">::</span> {<span style="font-weight: bold"><span style="color: #000000">constraint</span></span>(), <span style="color: #009900">Reason</span>, <span style="color: #009900">Value</span>}
+
+<span style="color: #009900">Reason</span> <span style="color: #990000">::</span> <span style="font-weight: bold"><span style="color: #000000">any</span></span>()
+<span style="color: #009900">Value</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>Reason for the constraint failure.</p></div>
+<div class="paragraph"><p>It includes the constraint function in question,
+a machine-readable error reason and the value that
+made the constraint fail.</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">cowboy(3)</a>,
+<a href="../cowboy_router">cowboy_router(3)</a>,
+<a href="../cowboy_req.match_cookies">cowboy_req:match_cookies(3)</a>,
+<a href="../cowboy_req.match_qs">cowboy_req:match_qs(3)</a></p></div>
+</div>
+</div>
+
+
+
+
+
+</div>
+
+<div class="span3 sidecol">
+
+
+<h3>
+	Cowboy
+	2.3
+	Function Reference
+	
+</h3>
+
+<ul>
+	
+		<li><a href="/docs/en/cowboy/2.3/guide">User Guide</a></li>
+	
+	
+		<li><a href="/docs/en/cowboy/2.3/manual">Function Reference</a></li>
+	
+	
+</ul>
+
+<h4 id="docs-nav">Navigation</h4>
+
+<h4>Version select</h4>
+<ul>
+	
+	
+	
+		<li><a href="/docs/en/cowboy/2.3/manual">2.3</a></li>
+	
+		<li><a href="/docs/en/cowboy/2.2/manual">2.2</a></li>
+	
+		<li><a href="/docs/en/cowboy/2.1/manual">2.1</a></li>
+	
+		<li><a href="/docs/en/cowboy/2.0/manual">2.0</a></li>
+	
+		<li><a href="/docs/en/cowboy/1.0/manual">1.0</a></li>
+	
+</ul>
+
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