<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="description" content="">
<meta name="author" content="Loïc Hoguin based on a design from (Soft10) Pol Cámara">
<meta name="generator" content="Hugo 0.37.1" />
<title>Nine Nines: Cowboy 2.0 pre-release 4</title>
<link href='https://fonts.googleapis.com/css?family=Open+Sans:400,700,400italic' rel='stylesheet' type='text/css'>
<link href="/css/99s.css?r=1" rel="stylesheet">
<link rel="shortcut icon" href="/img/ico/favicon.ico">
<link rel="apple-touch-icon-precomposed" sizes="114x114" href="/img/ico/apple-touch-icon-114.png">
<link rel="apple-touch-icon-precomposed" sizes="72x72" href="/img/ico/apple-touch-icon-72.png">
<link rel="apple-touch-icon-precomposed" href="/img/ico/apple-touch-icon-57.png">
</head>
<body class="">
<header id="page-head">
<div id="topbar" class="container">
<div class="row">
<div class="span2">
<h1 id="logo"><a href="/" title="99s">99s</a></h1>
</div>
<div class="span10">
<div id="side-header">
<nav>
<ul>
<li class="active"><a title="Hear my thoughts" href="/articles">Articles</a></li>
<li><a title="Watch my talks" href="/talks">Talks</a></li>
<li><a title="Read the docs" href="/docs">Documentation</a></li>
<li><a title="Request my services" href="/services">Consulting & Training</a></li>
</ul>
</nav>
<ul id="social">
<li>
<a href="https://github.com/ninenines" title="Check my Github repositories"><img src="/img/ico_github.png" data-hover="/img/ico_github_alt.png" alt="Github"></a>
</li>
<li>
<a title="Keep in touch!" href="http://twitter.com/lhoguin"><img src="/img/ico_microblog.png" data-hover="/img/ico_microblog_alt.png"></a>
</li>
<li>
<a title="Contact me" href="mailto:contact@ninenines.eu"><img src="/img/ico_mail.png" data-hover="/img/ico_mail_alt.png"></a>
</li>
</ul>
</div>
</div>
</div>
</div>
</header>
<div id="contents">
<div class="container">
<div class="row">
<div class="span9 maincol">
<article class="blog_item">
<header>
<h1 class="lined-header"><span>Cowboy 2.0 pre-release 4</span></h1>
<p class="date">
<span class="day">03</span>
<span class="month">Jan</span>
</p>
</header>
<div class="paragraph"><p>Cowboy <code>2.0.0-pre.4</code> has been released!</p></div>
<div class="paragraph"><p>This is the new recommended version of Cowboy.
While I would not recommend putting it in production
just yet, I do recommend you start writing new
applications with this Cowboy version.</p></div>
<div class="paragraph"><p>The most significant changes in the pre-release are:</p></div>
<div class="ulist"><ul>
<li>
<p>
A new architecture: there now is one process per
connection and one process per request. This was
done because HTTP/2 allows running requests concurrently.
</p>
</li>
<li>
<p>
Stream handlers. Every request, response and data goes
through stream handlers. They are meant to replace hooks
and more. They will be documented in a future pre-release.
Check <code>cowboy_stream</code> and <code>cowboy_stream_h</code> if interested.
</p>
</li>
<li>
<p>
Numerous changes to the <code>cowboy_req</code> interface. This
is very close to final. Check the manual for what changed.
</p>
</li>
<li>
<p>
The Req object is no longer passed in Websocket callbacks.
</p>
</li>
<li>
<p>
It is now possible to send frames directly from <code>websocket_init/1</code>.
</p>
</li>
<li>
<p>
SPDY support was removed, now that we have HTTP/2.
</p>
</li>
<li>
<p>
Update Ranch to 1.3. We still depend on Cowlib master
for the time being.
</p>
</li>
<li>
<p>
A much improved manual.
</p>
</li>
</ul></div>
<div class="paragraph"><p>The manual received a lot of love. It now has one page per
function with a detailed description, arguments list, return
value, changelog and examples. It also links to the other
relevant manual pages: <a href="https://ninenines.eu/docs/en/cowboy/2.0/manual/">https://ninenines.eu/docs/en/cowboy/2.0/manual/</a></p></div>
<div class="paragraph"><p>I am quite proud of the manual right now. While more
improvements can be made, what we have now is way better
than before. Feedback for further improvements is welcome!</p></div>
<div class="paragraph"><p>This is a significant step toward Cowboy 2.0. Almost all
the breaking changes are in. A few more pre-releases are
planned and will be released on a weekly basis (with exceptions).</p></div>
<div class="paragraph"><p>Cowboy is now tested and supported with Erlang/OTP 18.0 or above
on Arch Linux, FreeBSD, OSX, Ubuntu and Windows 7. Contact me
if you can provide permanent access to another platform for the
purposes of testing.</p></div>
<div class="paragraph"><p>Cowboy is now available from four locations:</p></div>
<div class="ulist"><ul>
<li>
<p>
<a href="https://git.ninenines.eu/cowboy.git">https://git.ninenines.eu/cowboy.git</a>
</p>
</li>
<li>
<p>
<a href="https://github.com/ninenines/cowboy.git">https://github.com/ninenines/cowboy.git</a>
</p>
</li>
<li>
<p>
<a href="https://bitbucket.org/ninenines/cowboy.git">https://bitbucket.org/ninenines/cowboy.git</a>
</p>
</li>
<li>
<p>
<a href="https://gitlab.com/ninenines/cowboy.git">https://gitlab.com/ninenines/cowboy.git</a>
</p>
</li>
</ul></div>
<div class="paragraph"><p>They are updated at the same time so there is no real difference.</p></div>
<div class="paragraph"><p>Cowboy 2.0 will be released once all the breaking changes
are completed and the temporarily removed features are
added back.</p></div>
<div class="paragraph"><p>Thanks for your patience. I know it took a long time.</p></div>
<hr/>
<div class="paragraph"><p>Half-price on all donations because I need a new hat:</p></div>
<form action="https://www.paypal.com/cgi-bin/webscr" method="post" style="display:inline">
<input type="hidden" name="cmd" value="_donations">
<input type="hidden" name="business" value="essen@ninenines.eu">
<input type="hidden" name="lc" value="FR">
<input type="hidden" name="item_name" value="Loic Hoguin">
<input type="hidden" name="item_number" value="99s">
<input type="hidden" name="currency_code" value="EUR">
<input type="hidden" name="bn" value="PP-DonationsBF:btn_donate_LG.gif:NonHosted">
<input type="image" src="https://www.paypalobjects.com/en_US/i/btn/btn_donate_LG.gif" border="0" name="submit" alt="PayPal - The safer, easier way to pay online!">
<img alt="" border="0" src="https://www.paypalobjects.com/fr_FR/i/scr/pixel.gif" width="1" height="1">
</form>
</article>
</div>
<div class="span3 sidecol">
<h3>More articles</h3>
<ul id="articles-nav" class="extra_margin">
<li><a href="https://ninenines.eu/articles/cowboy-2.3.0/">Cowboy 2.3</a></li>
<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:contact@ninenines.eu">email us</a>
if you found any mistake or need clarification on any of the
articles.</p>
</div>
</div>
</div>
</div>
<footer>
<div class="container">
<div class="row">
<div class="span6">
<p id="scroll-top"><a href="#">↑ Scroll to top</a></p>
<nav>
<ul>
<li><a href="mailto:contact@ninenines.eu" title="Contact us">Contact us</a></li><li><a href="https://github.com/ninenines/ninenines.github.io" title="Github repository">Contribute to this site</a></li>
</ul>
</nav>
</div>
<div class="span6 credits">
<p><img src="/img/footer_logo.png"></p>
<p>Copyright © Loïc Hoguin 2012-2016</p>
</div>
</div>
</div>
</footer>
<script src="/js/custom.js"></script>
</body>
</html>