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<h1 class="lined-header"><span>cowboy:set_env(3)</span></h1>
<h2 id="_name">Name</h2>
<p>cowboy:set_env - Update a listener's environment value</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">set_env</font></b>(<font color="#009900">Name</font> <font color="#990000">::</font> <b><font color="#000000">ranch:ref</font></b>(),
<font color="#009900">Key</font> <font color="#990000">::</font> <b><font color="#000080">atom</font></b>(),
<font color="#009900">Value</font> <font color="#990000">::</font> <b><font color="#000000">any</font></b>())
<font color="#990000">-></font> <font color="#FF6600">ok</font></tt></pre>
</div></div>
<p>Set or update an environment value for a previously started listener.</p>
<p>This is most useful for updating the routes dynamically, without having to restart the listener.</p>
<p>The new value will only be available to new connections. Pre-existing connections will still use the old value.</p>
<h2 id="_arguments">Arguments</h2>
<dl><dt>Name</dt>
<dd><p>The name of the listener to update.</p>
<p>The name of the listener is the first argument given to the <a href="../cowboy.start_clear">cowboy:start_clear(3)</a>, <a href="../cowboy.start_tls">cowboy:start_tls(3)</a> or <a href="../ranch.start_listener">ranch:start_listener(3)</a> function.</p>
</dd>
<dt>Key</dt>
<dd><p>The key in the environment map. Common keys include <code>dispatch</code> and <code>middlewares</code>.</p>
</dd>
<dt>Value</dt>
<dd><p>The new value.</p>
<p>The type of the value differs depending on the key.</p>
</dd>
</dl>
<h2 id="_return_value">Return value</h2>
<p>The atom <code>ok</code> is returned on success.</p>
<p>An <code>exit:badarg</code> exception is thrown when the listener does not exist.</p>
<h2 id="_changelog">Changelog</h2>
<ul><li><strong>1.0</strong>: Function introduced.
</li>
</ul>
<h2 id="_examples">Examples</h2>
<div class="listingblock"><div class="title">Update a listener's routes</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="#FF0000">"/ws"</font>, <font color="#FF6600">websocket_h</font>, []}
]}
]),
<b><font color="#000000">cowboy:set_env</font></b>(<font color="#FF6600">example</font>, <font color="#FF6600">dispatch</font>, <font color="#009900">Dispatch</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.start_tls">cowboy:start_tls(3)</a>, <a href="../ranch.set_protocol_options">ranch:set_protocol_options(3)</a></p>
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<h3>
Cowboy
2.6
Function Reference
</h3>
<ul>
<li><a href="/docs/en/cowboy/2.6/guide">User Guide</a></li>
<li><a href="/docs/en/cowboy/2.6/manual">Function Reference</a></li>
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<h4 id="docs-nav">Navigation</h4>
<h4>Version select</h4>
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<li><a href="/docs/en/cowboy/2.7/manual">2.7</a></li>
<li><a href="/docs/en/cowboy/2.6/manual">2.6</a></li>
<li><a href="/docs/en/cowboy/2.5/manual">2.5</a></li>
<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>
</ul>
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