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<title>Nine Nines: Cowboy Function Reference</title>
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<h1 class="lined-header"><span>Cowboy Function Reference</span></h1>
<h2 id="_name">Name</h2>
<p>cowboy - Small, fast, modern HTTP server for Erlang/OTP</p>
<h2 id="_description">Description</h2>
<p>Cowboy is an HTTP server for Erlang/OTP with support for the HTTP/1.1, HTTP/2 and Websocket protocols.</p>
<p>Cowboy aims to provide a complete HTTP stack. This includes the implementation of the HTTP RFCs but also any directly related standards, like Websocket or Server-Sent Events.</p>
<h2 id="_modules">Modules</h2>
<p>Functions:</p>
<ul><li><a href="cowboy">cowboy(3)</a> - Listener management
</li>
<li><a href="cowboy_req">cowboy_req(3)</a> - Request and response
</li>
<li><a href="cowboy_router">cowboy_router(3)</a> - Router
</li>
<li><a href="cowboy_constraints">cowboy_constraints(3)</a> - Constraints
</li>
</ul>
<p>Protocols:</p>
<ul><li><a href="cowboy_http">cowboy_http(3)</a> - HTTP/1.1
</li>
<li><a href="cowboy_http2">cowboy_http2(3)</a> - HTTP/2
</li>
<li><a href="cowboy_websocket">cowboy_websocket(3)</a> - Websocket
</li>
</ul>
<p>Handlers:</p>
<ul><li><a href="cowboy_static">cowboy_static(3)</a> - Static file handler
</li>
</ul>
<p>Behaviors:</p>
<ul><li><a href="cowboy_handler">cowboy_handler(3)</a> - Plain HTTP handlers
</li>
<li><a href="cowboy_loop">cowboy_loop(3)</a> - Loop handlers
</li>
<li><a href="cowboy_middleware">cowboy_middleware(3)</a> - Middlewares
</li>
<li><a href="cowboy_rest">cowboy_rest(3)</a> - REST handlers
</li>
<li><a href="cowboy_stream">cowboy_stream(3)</a> - Stream handlers
</li>
<li><a href="cowboy_websocket">cowboy_websocket(3)</a> - Websocket handlers
</li>
</ul>
<p>Middlewares:</p>
<ul><li><a href="cowboy_router">cowboy_router(3)</a> - Router middleware
</li>
<li><a href="cowboy_handler">cowboy_handler(3)</a> - Handler middleware
</li>
</ul>
<!-- @todo http_status_codes is not linked to; what to do with it?-->
<h2 id="_dependencies">Dependencies</h2>
<ul><li><a href="ranch_app">ranch(7)</a> - Socket acceptor pool for TCP protocols
</li>
<li><a href="cowlib_app">cowlib(7)</a> - Support library for manipulating Web protocols
</li>
<li>ssl - Secure communication over sockets
</li>
<li>crypto - Crypto functions
</li>
</ul>
<p>All these applications must be started before the <code>cowboy</code> application. To start Cowboy and all dependencies at once:</p>
<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>{<font color="#FF6600">ok</font>, <font color="#990000">_</font>} <font color="#990000">=</font> <b><font color="#000000">application:ensure_all_started</font></b>(<font color="#FF6600">cowboy</font>)<font color="#990000">.</font></tt></pre>
</div></div>
<h2 id="_environment">Environment</h2>
<p>The <code>cowboy</code> application does not define any application environment configuration parameters.</p>
<h2 id="_see_also">See also</h2>
<p><a href="ranch_app">ranch(7)</a>, <a href="cowlib_app">cowlib(7)</a></p>
</div>
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<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/2.4/manual">2.4</a></li>
<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>
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