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<title>Nine Nines: cowboy:start_clear(3)</title>
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<h1 class="lined-header"><span>cowboy:start_clear(3)</span></h1>
<h2 id="_name">Name</h2>
<p>cowboy:start_clear - Listen for connections using plain TCP</p>
<h2 id="_description">Description</h2>
<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><b><font color="#000000">start_clear</font></b>(<font color="#009900">Name</font> <font color="#990000">::</font> <b><font color="#000000">ranch:ref</font></b>(),
<font color="#009900">TransportOpts</font> <font color="#990000">::</font> <b><font color="#000000">ranch_tcp:opts</font></b>(),
<font color="#009900">ProtocolOpts</font> <font color="#990000">::</font> <b><font color="#000000">opts</font></b>())
<font color="#990000">-></font> {<font color="#FF6600">ok</font>, <font color="#009900">ListenerPid</font> <font color="#990000">::</font> <b><font color="#000080">pid</font></b>()}
| {<font color="#FF6600">error</font>, <b><font color="#000000">any</font></b>()}</tt></pre>
</div></div>
<p>Start listening for connections over a clear TCP channel.</p>
<p>Both HTTP/1.1 and HTTP/2 are supported on this listener. HTTP/2 has two methods of establishing a connection over a clear TCP channel. Both the upgrade and the prior knowledge methods are supported.</p>
<h2 id="_arguments">Arguments</h2>
<dl><dt>Name</dt>
<dd><p>The listener name is used to refer to this listener in future calls, for example when stopping it or when updating the routes defined.</p>
<p>It can be any Erlang term. An atom is generally good enough, for example <code>api</code>, <code>my_app_clear</code> or <code>my_app_tls</code>.</p>
</dd>
<dt>TransportOpts</dt>
<dd><p>The transport options are where the TCP options, including the listener's port number, are defined. Transport options are provided as a list of keys and values, for example <code>[{port, 8080}]</code>.</p>
<p>The available options are documented in the <a href="../ranch_tcp">ranch_tcp(3)</a> manual.</p>
</dd>
<dt>ProtocolOpts</dt>
<dd><p>The protocol options are in a map containing all the options for the different protocols that may be involved when connecting to the listener, including HTTP/1.1 and HTTP/2.</p>
<p>The HTTP/1.1 options are documented in the <a href="../cowboy_http">cowboy_http(3)</a> manual; and the HTTP/2 options in <a href="../cowboy_http2">cowboy_http2(3)</a>.</p>
</dd>
</dl>
<h2 id="_return_value">Return value</h2>
<p>An ok tuple is returned on success. It contains the pid of the top-level supervisor for the listener.</p>
<p>An error tuple is returned on error. The error reason may be any Erlang term.</p>
<p>A common error is <code>eaddrinuse</code>. It indicates that the port configured for Cowboy is already in use.</p>
<h2 id="_changelog">Changelog</h2>
<ul><li><strong>2.0</strong>: HTTP/2 support added.
</li>
<li><strong>2.0</strong>: Function introduced. Replaces <code>cowboy:start_http/4</code>.
</li>
</ul>
<h2 id="_examples">Examples</h2>
<div class="listingblock"><div class="title">Start a listener</div>
<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="#009900">Dispatch</font> <font color="#990000">=</font> <b><font color="#000000">cowboy_router:compile</font></b>([
{<font color="#FF6600">'_'</font>, [
{<font color="#FF0000">"/"</font>, <font color="#FF6600">toppage_h</font>, []}
]}
]),
{<font color="#FF6600">ok</font>, <font color="#990000">_</font>} <font color="#990000">=</font> <b><font color="#000000">cowboy:start_clear</font></b>(<font color="#FF6600">example</font>, [{<font color="#FF6600">port</font>, <font color="#993399">8080</font>}], #{
<font color="#0000FF">env</font> <font color="#990000">=></font> #{<font color="#0000FF">dispatch</font> <font color="#990000">=></font> <font color="#009900">Dispatch</font>}
})<font color="#990000">.</font></tt></pre>
</div></div>
<div class="listingblock"><div class="title">Start a listener on a random port</div>
<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="#009900">Name</font> <font color="#990000">=</font> <font color="#FF6600">example</font>,
{<font color="#FF6600">ok</font>, <font color="#990000">_</font>} <font color="#990000">=</font> <b><font color="#000000">cowboy:start_clear</font></b>(<font color="#009900">Name</font>, [], #{
<font color="#0000FF">env</font> <font color="#990000">=></font> #{<font color="#0000FF">dispatch</font> <font color="#990000">=></font> <font color="#009900">Dispatch</font>}
}),
<font color="#009900">Port</font> <font color="#990000">=</font> <b><font color="#000000">ranch:get_port</font></b>(<font color="#009900">Name</font>)<font color="#990000">.</font></tt></pre>
</div></div>
<h2 id="_see_also">See also</h2>
<p><a href="../cowboy">cowboy(3)</a>, <a href="../cowboy.start_tls">cowboy:start_tls(3)</a>, <a href="../cowboy.stop_listener">cowboy:stop_listener(3)</a>, <a href="../ranch">ranch(3)</a></p>
</div>
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<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/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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