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<title>Nine Nines: cowboy_sub_protocol(3)</title>
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<h1 class="lined-header"><span>cowboy_sub_protocol(3)</span></h1>
<div class="sect1">
<h2 id="_name">Name</h2>
<div class="sectionbody">
<div class="paragraph"><p>cowboy_sub_protocol - sub protocol</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_description">Description</h2>
<div class="sectionbody">
<div class="paragraph"><p>The <code>cowboy_sub_protocol</code> behaviour defines the interface used
by modules that implement a protocol on top of HTTP.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_callbacks">Callbacks</h2>
<div class="sectionbody">
<div class="sect2">
<h3 id="_upgrade_req_env_handler_handleropts_8594_ok_req_env_suspend_module_function_args_stop_req">upgrade(Req, Env, Handler, HandlerOpts) → {ok, Req, Env} | {suspend, Module, Function, Args} | {stop, Req}</h3>
<div class="dlist"><dl>
<dt class="hdlist1">
Req = cowboy_req:req()
</dt>
<dd>
<p>
The Req object.
</p>
</dd>
<dt class="hdlist1">
Env = env()
</dt>
<dd>
<p>
The request environment.
</p>
</dd>
<dt class="hdlist1">
Handler = module()
</dt>
<dd>
<p>
Handler module.
</p>
</dd>
<dt class="hdlist1">
Opts = any()
</dt>
<dd>
<p>
Handler options.
</p>
</dd>
<dt class="hdlist1">
Module = module()
</dt>
<dd>
<p>
MFA to call when resuming the process.
</p>
</dd>
<dt class="hdlist1">
Function = atom()
</dt>
<dd>
<p>
MFA to call when resuming the process.
</p>
</dd>
<dt class="hdlist1">
Args = [any()]
</dt>
<dd>
<p>
MFA to call when resuming the process.
</p>
</dd>
</dl></div>
<div class="paragraph"><p>Upgrade the protocol.</p></div>
<div class="paragraph"><p>Please refer to the <code>cowboy_middleware</code> manual for a
description of the return values.</p></div>
</div>
</div>
</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>
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<h4>Version select</h4>
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<li><a href="/docs/en/cowboy/1.0/manual">1.0</a></li>
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