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<h1 class="lined-header"><span>gun_upgrade(3)</span></h1>
<h2 id="_name">Name</h2>
<p>gun_upgrade - Successful protocol upgrade</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>{<font color="#FF6600">gun_upgrade</font>, <font color="#009900">ConnPid</font>, <font color="#009900">StreamRef</font>, <font color="#009900">Protocols</font>, <font color="#009900">Headers</font>}
<font color="#009900">ConnPid</font> <font color="#990000">::</font> <b><font color="#000080">pid</font></b>()
<font color="#009900">StreamRef</font> <font color="#990000">::</font> <b><font color="#000080">reference</font></b>()
<font color="#009900">Protocols</font> <font color="#990000">::</font> [<font color="#990000"><<</font><font color="#FF0000">"websocket"</font><font color="#990000">>></font>]
<font color="#009900">Headers</font> <font color="#990000">::</font> [{<b><font color="#000080">binary</font></b>(), <b><font color="#000080">binary</font></b>()}]</tt></pre>
</div></div>
<p>Successful protocol upgrade.</p>
<p>This message informs the relevant process that the server accepted to upgrade to one or more protocols given in the original request.</p>
<p>The exact semantics of this message depend on the original protocol. HTTP/1.1 upgrades apply to the entire connection. HTTP/2 uses a different mechanism which allows switching specific streams to a different protocol.</p>
<p>Gun currently only supports upgrading HTTP/1.1 connections to the Websocket protocol.</p>
<h2 id="_elements">Elements</h2>
<dl><dt>ConnPid</dt>
<dd><p>The pid of the Gun connection process.</p>
</dd>
<dt>StreamRef</dt>
<dd><p>Identifier of the stream that resulted in an upgrade.</p>
</dd>
<dt>Protocols</dt>
<dd><p>List of protocols this stream was upgraded to.</p>
</dd>
<dt>Headers</dt>
<dd><p>Headers sent with the upgrade response.</p>
</dd>
</dl>
<h2 id="_changelog">Changelog</h2>
<ul><li><strong>1.0</strong>: Message introduced.
</li>
</ul>
<h2 id="_examples">Examples</h2>
<div class="listingblock"><div class="title">Receive a gun_upgrade message in a gen_server</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><b><font color="#000000">handle_info</font></b>({<font color="#FF6600">gun_upgrade</font>, <font color="#009900">ConnPid</font>, <font color="#009900">_StreamRef</font>,
<font color="#009900">_Protocols</font>, <font color="#009900">_Headers</font>},
<font color="#009900">State</font><font color="#990000">=</font><font color="#008080">#state</font>{<font color="#0000FF">conn_pid</font><font color="#990000">=</font><font color="#009900">ConnPid</font>}) <font color="#990000">-></font>
<i><font color="#9A1900">%% Do something.</font></i>
{<font color="#FF6600">noreply</font>, <font color="#009900">State</font>}<font color="#990000">.</font></tt></pre>
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<h2 id="_see_also">See also</h2>
<p><a href="../gun">gun(3)</a>, <a href="../gun.ws_upgrade">gun:ws_upgrade(3)</a>, <a href="../gun.ws_send">gun:ws_send(3)</a>, <a href="../gun_ws">gun_ws(3)</a></p>
</div>
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<h3>
Gun
1.0
Function Reference
</h3>
<ul>
<li><a href="/docs/en/gun/1.0/guide">User Guide</a></li>
<li><a href="/docs/en/gun/1.0/manual">Function Reference</a></li>
</ul>
<h4 id="docs-nav">Navigation</h4>
<h4>Version select</h4>
<ul>
<li><a href="/docs/en/gun/1.2/manual">1.2</a></li>
<li><a href="/docs/en/gun/1.1/manual">1.1</a></li>
<li><a href="/docs/en/gun/1.0/manual">1.0</a></li>
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