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<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>
<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>
<h2 id="_features_added">Features added</h2>
<ul><li>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.
</li>
<li>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.
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<li>Update Cowlib to 2.2.1.
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<li>Add support for the 308 status code and a test suite for RFC7538 where it is defined.
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</ul>
<h2 id="_bugs_fixed">Bugs fixed</h2>
<ul><li>Ensure timeout options accept the value <code>infinity</code> as documented.
</li>
<li>Properly reject HTTP/2 requests with an invalid content-length header instead of simply crashing.
</li>
<li>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.
</li>
<li>Parsing of the x-forwarded-for header has been corrected. It now supports IPv6 addresses both with and without port.
</li>
<li>Websocket subprotocol tokens are now parsed in a case insensitive manner, according to the spec.
</li>
<li>Cookies without values are now allowed. For example <code>Cookie: foo</code>.
</li>
<li>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.
</li>
<li>The <code>cowboy_req:delete_resp_header/2</code> function will no longer crash when no response header was set before calling it.
</li>
<li>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.
</li>
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<nav style="margin:1em 0">
<a style="float:left" href="https://ninenines.eu/docs/en/cowboy/2.7/guide/migrating_from_2.3/">
Migrating from Cowboy 2.3 to 2.4
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<a style="float:right" href="https://ninenines.eu/docs/en/cowboy/2.7/guide/migrating_from_2.1/">
Migrating from Cowboy 2.1 to 2.2
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<h3>
Cowboy
2.7
User Guide
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<li><a href="/docs/en/cowboy/2.7/guide">User Guide</a></li>
<li><a href="/docs/en/cowboy/2.7/manual">Function Reference</a></li>
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<h4>Version select</h4>
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<li><a href="/docs/en/cowboy/2.8/guide">2.8</a></li>
<li><a href="/docs/en/cowboy/2.7/guide">2.7</a></li>
<li><a href="/docs/en/cowboy/2.6/guide">2.6</a></li>
<li><a href="/docs/en/cowboy/2.5/guide">2.5</a></li>
<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>
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