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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&apos;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">-&gt;</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&apos;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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