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<h1 class="lined-header"><span>cowboy:start_tls(3)</span></h1>

<h2 id="_name">Name</h2>
<p>cowboy:start_tls - Listen for connections using TLS</p>
<h2 id="_description">Description</h2>
<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">start_tls</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_ssl:opts</font></b>(),
          <font color="#009900">ProtocolOpts</font>  <font color="#990000">::</font> <b><font color="#000000">opts</font></b>())
    <font color="#990000">-&gt;</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 secure TLS channel.</p>
<p>Both HTTP/1.1 and HTTP/2 are supported on this listener. The ALPN TLS extension must be used to initiate an HTTP/2 connection.</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&apos;s port number, are defined. They also contain the TLS options, like the server&apos;s certificate. Transport options are provided as a list of keys and values, for example <code>[{port, 8443}, {certfile, &quot;path/to/cert.pem&quot;}]</code>.</p>
<p>The available options are documented in the <a href="../ranch_ssl">ranch_ssl(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_https/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 3.1.9
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_tls</font></b>(<font color="#FF6600">example</font>, [
    {<font color="#FF6600">port</font>, <font color="#993399">8443</font>},
    {<font color="#FF6600">cert</font>, <font color="#FF0000">"path/to/cert.pem"</font>}
], #{
    <font color="#0000FF">env</font> <font color="#990000">=&gt;</font> #{<font color="#0000FF">dispatch</font> <font color="#990000">=&gt;</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 3.1.9
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_tls</font></b>(<font color="#009900">Name</font>, [
    {<font color="#FF6600">cert</font>, <font color="#FF0000">"path/to/cert.pem"</font>}
], #{
    <font color="#0000FF">env</font> <font color="#990000">=&gt;</font> #{<font color="#0000FF">dispatch</font> <font color="#990000">=&gt;</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_clear">cowboy:start_clear(3)</a>, <a href="../cowboy.stop_listener">cowboy:stop_listener(3)</a>, <a href="../ranch">ranch(3)</a></p>






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