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<meta name="author" content="Loïc Hoguin based on a design from (Soft10) Pol Cámara">
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<title>Nine Nines: Cowboy 2.2</title>
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<h1 class="lined-header"><span>Cowboy 2.2</span></h1>
<p class="date">
<span class="day">13</span>
<span class="month">Dec</span>
</p>
</header>
<div class="paragraph"><p>Cowboy <code>2.2.0</code> has been released!</p></div>
<div class="paragraph"><p>This release focused on adding features required for writing
gRPC servers and on completing test suites for the core
HTTP RFCs.</p></div>
<div class="ulist"><ul>
<li>
<p>
The <code>cowboy_req:stream_trailers/2</code> function has been
added. It terminates the streamed response by adding
some trailer field values. This feature is required
for gRPC.
</p>
</li>
<li>
<p>
The <code>max_skip_body_length</code> option was added. It controls
how much of the request body we are willing to skip
to get to the next request for HTTP/1.1 keep-alive
connections.
</p>
</li>
<li>
<p>
The CONNECT and TRACE methods have been disabled
entirely. They are currently not implemented and
their behavior is very specific (unlike most other
methods) so it is safer to prevent their use.
</p>
</li>
</ul></div>
<div class="paragraph"><p>Many bugs have also been fixed. A more complete
list of changes can be found in the migration guide:
<a href="https://ninenines.eu/docs/en/cowboy/2.2/guide/migrating_from_2.0/">Migrating from Cowboy 2.1 to 2.2</a>.</p></div>
<div class="paragraph"><p>The next two releases will tentatively focus on improving
the support for cookies and CORS, but I’m open to suggestions.
If there is a pain point in Cowboy 2.2 I would love to hear
about it.</p></div>
<div class="paragraph"><p>You can donate to this project via
<a href="https://salt.bountysource.com/teams/ninenines">BountySource</a>
because I need to eat snacks when I write code.
Thanks in advance!</p></div>
<div class="paragraph"><p>As usual, any feedback is appreciated, and any issues
should be reported by opening a ticket. Thanks!</p></div>
</article>
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<div class="span3 sidecol">
<h3>More articles</h3>
<ul id="articles-nav" class="extra_margin">
<li><a href="https://ninenines.eu/articles/cowboy-2.2.0/">Cowboy 2.2</a></li>
<li><a href="https://ninenines.eu/articles/cowboy-2.1.0/">Cowboy 2.1</a></li>
<li><a href="https://ninenines.eu/articles/cowboy-2.0.0/">Cowboy 2.0</a></li>
<li><a href="https://ninenines.eu/articles/cowboy-2.0.0-rc.2/">Cowboy 2.0 release candidate 2</a></li>
<li><a href="https://ninenines.eu/articles/cowboy-2.0.0-rc.1/">Cowboy 2.0 release candidate 1</a></li>
<li><a href="https://ninenines.eu/articles/the-elephant-in-the-room/">The elephant in the room</a></li>
<li><a href="https://ninenines.eu/articles/dont-let-it-crash/">Don't let it crash</a></li>
<li><a href="https://ninenines.eu/articles/cowboy-2.0.0-pre.4/">Cowboy 2.0 pre-release 4</a></li>
<li><a href="https://ninenines.eu/articles/ranch-1.3/">Ranch 1.3</a></li>
<li><a href="https://ninenines.eu/articles/ml-archives/">Mailing list archived</a></li>
<li><a href="https://ninenines.eu/articles/website-update/">Website update</a></li>
<li><a href="https://ninenines.eu/articles/erlanger-playbook-september-2015-update/">The Erlanger Playbook September 2015 Update</a></li>
<li><a href="https://ninenines.eu/articles/erlanger-playbook/">The Erlanger Playbook</a></li>
<li><a href="https://ninenines.eu/articles/erlang-validate-utf8/">Validating UTF-8 binaries with Erlang</a></li>
<li><a href="https://ninenines.eu/articles/on-open-source/">On open source</a></li>
<li><a href="https://ninenines.eu/articles/the-story-so-far/">The story so far</a></li>
<li><a href="https://ninenines.eu/articles/cowboy2-qs/">Cowboy 2.0 and query strings</a></li>
<li><a href="https://ninenines.eu/articles/january-2014-status/">January 2014 status</a></li>
<li><a href="https://ninenines.eu/articles/farwest-funded/">Farwest got funded!</a></li>
<li><a href="https://ninenines.eu/articles/erlang.mk-and-relx/">Build Erlang releases with Erlang.mk and Relx</a></li>
<li><a href="https://ninenines.eu/articles/xerl-0.5-intermediate-module/">Xerl: intermediate module</a></li>
<li><a href="https://ninenines.eu/articles/xerl-0.4-expression-separator/">Xerl: expression separator</a></li>
<li><a href="https://ninenines.eu/articles/erlang-scalability/">Erlang Scalability</a></li>
<li><a href="https://ninenines.eu/articles/xerl-0.3-atomic-expressions/">Xerl: atomic expressions</a></li>
<li><a href="https://ninenines.eu/articles/xerl-0.2-two-modules/">Xerl: two modules</a></li>
<li><a href="https://ninenines.eu/articles/xerl-0.1-empty-modules/">Xerl: empty modules</a></li>
<li><a href="https://ninenines.eu/articles/ranch-ftp/">Build an FTP Server with Ranch in 30 Minutes</a></li>
<li><a href="https://ninenines.eu/articles/tictactoe/">Erlang Tic Tac Toe</a></li>
</ul>
<h3>Feedback</h3>
<p>Feel free to <a href="mailto:[email protected]">email us</a>
if you found any mistake or need clarification on any of the
articles.</p>
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