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<title>Nine Nines: Migrating from Cowboy 2.3 to 2.4</title>
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<h1 class="lined-header"><span>Migrating from Cowboy 2.3 to 2.4</span></h1>
<div class="paragraph"><p>Cowboy 2.4 focused on improving the HTTP/2 implementation.
All existing tests from RFC7540 and the h2spec test suite
now all pass. Numerous options have been added to control
SETTINGS and related behavior. In addition experimental
support for Websocket over HTTP/2 was added.</p></div>
<div class="sect1">
<h2 id="_features_added">Features added</h2>
<div class="sectionbody">
<div class="ulist"><ul>
<li>
<p>
Add experimental support for Websocket over HTTP/2.
You can use the <code>enable_connect_protocol</code> option to
enable. It implements the following draft:
<a href="https://tools.ietf.org/html/draft-ietf-httpbis-h2-websockets-01">https://tools.ietf.org/html/draft-ietf-httpbis-h2-websockets-01</a>
</p>
</li>
<li>
<p>
Add options <code>max_decode_table_size</code> and
<code>max_encode_table_size</code> to restrict the size of the
HPACK compression dictionary.
</p>
</li>
<li>
<p>
Add option <code>max_concurrent_streams</code> to restrict the
number of HTTP/2 streams that can be opened concurrently.
</p>
</li>
<li>
<p>
Add options <code>initial_connection_window_size</code> and
<code>initial_stream_window_size</code> to restrict the size of
the HTTP/2 request body buffers for the whole connection
and per stream, respectively.
</p>
</li>
<li>
<p>
Add options <code>max_frame_size_received</code> and
<code>max_frame_size_sent</code> to restrict the size of
HTTP/2 frames.
</p>
</li>
<li>
<p>
Add option <code>settings_timeout</code> to reject clients that
did not send a SETTINGS ack. Note that this currently
may only occur at the beginning of the connection.
</p>
</li>
<li>
<p>
Update Ranch to 1.5.0
</p>
</li>
<li>
<p>
Update Cowlib to 2.3.0
</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>
Fix the END_STREAM flag for informational responses
when using HTTP/2.
</p>
</li>
<li>
<p>
Receive and ignore HTTP/2 request trailers if any
for HTTP/2 requests. Request trailer information will
be propagated to the user code in a future release.
</p>
</li>
<li>
<p>
Reject WINDOW_UPDATE frames that are sent after the
client sent an RST_STREAM. Note that Cowboy will not
keep state information about terminated streams
forever and so the behavior might differ depending
on when the stream was reset.
</p>
</li>
<li>
<p>
Reject streams that depend on themselves. Note that
Cowboy currently does not implement HTTP/2’s priority
mechanisms so this issue was harmless.
</p>
</li>
<li>
<p>
Reject HTTP/2 requests where the body size is different
than the content-length value. Note that due to how Cowboy
works some requests might go through regardless, for
example when the user code does not read the request body.
</p>
</li>
<li>
<p>
Fix all existing test failures from RFC7540. This was
mostly incorrect test cases or intermittent failures.
</p>
</li>
</ul></div>
</div>
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<nav style="margin:1em 0">
<a style="float:left" href="https://ninenines.eu/docs/en/cowboy/2.4/guide/middlewares/">
Middlewares
</a>
<a style="float:right" href="https://ninenines.eu/docs/en/cowboy/2.4/guide/migrating_from_2.2/">
Migrating from Cowboy 2.2 to 2.3
</a>
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<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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