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<meta name="author" content="Loïc Hoguin based on a design from (Soft10) Pol Cámara">
<title>Nine Nines: Migrating from Cowboy 2.2 to 2.3</title>
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<h1 class="lined-header"><span>Migrating from Cowboy 2.2 to 2.3</span></h1>
<div class="paragraph"><p>Cowboy 2.3 focused on making the Cowboy processes behave
properly according to OTP principles. This version is a
very good milestone toward that goal and most of everything
should now work. Release upgrades and a few details will
be improved in future versions.</p></div>
<div class="sect1">
<h2 id="_features_added">Features added</h2>
<div class="sectionbody">
<div class="ulist"><ul>
<li>
<p>
Add support for all functions from the module <code>sys</code>. Note
that Cowboy currently does not implement the <code>sys</code> debugging
mechanisms as tracing is recommended instead.
</p>
</li>
<li>
<p>
Add a <code>max_frame_size</code> option for Websocket handlers
to close the connection when the client attempts to
send a frame that’s too large. It currently defaults
to <code>infinity</code> to avoid breaking existing code but will
be changed in a future version.
</p>
</li>
<li>
<p>
Update Cowlib to 2.2.1.
</p>
</li>
<li>
<p>
Add support for the 308 status code and a test suite
for RFC7538 where it is defined.
</p>
</li>
</ul></div>
</div>
</div>
<div class="sect1">
<h2 id="_bugs_fixed">Bugs fixed</h2>
<div class="sectionbody">
<div class="ulist"><ul>
<li>
<p>
Ensure timeout options accept the value <code>infinity</code> as
documented.
</p>
</li>
<li>
<p>
Properly reject HTTP/2 requests with an invalid content-length
header instead of simply crashing.
</p>
</li>
<li>
<p>
When switching from HTTP/1.1 to Websocket or user protocols
all the messages in the mailbox were flushed. Only messages
specific to <code>cowboy_http</code> should now be flushed.
</p>
</li>
<li>
<p>
Parsing of the x-forwarded-for header has been corrected.
It now supports IPv6 addresses both with and without port.
</p>
</li>
<li>
<p>
Websocket subprotocol tokens are now parsed in a case
insensitive manner, according to the spec.
</p>
</li>
<li>
<p>
Cookies without values are now allowed. For example <code>Cookie: foo</code>.
</p>
</li>
<li>
<p>
Colons are now allowed within path segments in routes provided
to <code>cowboy_router:compile/1</code> as long as they are not the first
character of the path segment.
</p>
</li>
<li>
<p>
The <code>cowboy_req:delete_resp_header/2</code> function will no longer
crash when no response header was set before calling it.
</p>
</li>
<li>
<p>
A miscount of the output HTTP/2 flow control window has been
fixed. It prevented sending the response body fully to some
clients. The issue only affected response bodies sent as iolists.
</p>
</li>
</ul></div>
</div>
</div>
<nav style="margin:1em 0">
<a style="float:left" href="https://ninenines.eu/docs/en/cowboy/2.4/guide/migrating_from_2.3/">
Migrating from Cowboy 2.3 to 2.4
</a>
<a style="float:right" href="https://ninenines.eu/docs/en/cowboy/2.4/guide/migrating_from_2.1/">
Migrating from Cowboy 2.1 to 2.2
</a>
</nav>
</div>
<div class="span3 sidecol">
<h3>
Cowboy
2.4
User Guide
</h3>
<ul>
<li><a href="/docs/en/cowboy/2.4/guide">User Guide</a></li>
<li><a href="/docs/en/cowboy/2.4/manual">Function Reference</a></li>
</ul>
<h4 id="docs-nav">Navigation</h4>
<h4>Version select</h4>
<ul>
<li><a href="/docs/en/cowboy/2.4/guide">2.4</a></li>
<li><a href="/docs/en/cowboy/2.3/guide">2.3</a></li>
<li><a href="/docs/en/cowboy/2.2/guide">2.2</a></li>
<li><a href="/docs/en/cowboy/2.1/guide">2.1</a></li>
<li><a href="/docs/en/cowboy/2.0/guide">2.0</a></li>
<li><a href="/docs/en/cowboy/1.0/guide">1.0</a></li>
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