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<h1 class="lined-header"><span>Cowboy 2.0 pre-release 4</span></h1>
<p class="date">
<span class="year">2017</span>
<span class="day-month">03 Jan</span>
</p>
</header>
<p>Cowboy <code>2.0.0-pre.4</code> has been released!</p>
<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>
<p>The most significant changes in the pre-release are:</p>
<ul><li>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.
</li>
<li>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.
</li>
<li>Numerous changes to the <code>cowboy_req</code> interface. This is very close to final. Check the manual for what changed.
</li>
<li>The Req object is no longer passed in Websocket callbacks.
</li>
<li>It is now possible to send frames directly from <code>websocket_init/1</code>.
</li>
<li>SPDY support was removed, now that we have HTTP/2.
</li>
<li>Update Ranch to 1.3. We still depend on Cowlib master for the time being.
</li>
<li>A much improved manual.
</li>
</ul>
<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>
<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>
<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>
<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>
<p>Cowboy is now available from four locations:</p>
<ul><li><a href="https://git.ninenines.eu/cowboy.git">https://git.ninenines.eu/cowboy.git</a>
</li>
<li><a href="https://github.com/ninenines/cowboy.git">https://github.com/ninenines/cowboy.git</a>
</li>
<li><a href="https://bitbucket.org/ninenines/cowboy.git">https://bitbucket.org/ninenines/cowboy.git</a>
</li>
<li><a href="https://gitlab.com/ninenines/cowboy.git">https://gitlab.com/ninenines/cowboy.git</a>
</li>
</ul>
<p>They are updated at the same time so there is no real difference.</p>
<p>Cowboy 2.0 will be released once all the breaking changes are completed and the temporarily removed features are added back.</p>
<p>Thanks for your patience. I know it took a long time.</p>
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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/merry-christmas-2019/">Merry Christmas 2019: New Beginnings</a></li>
<li><a href="https://ninenines.eu/articles/github-sponsors/">GitHub Sponsors</a></li>
<li><a href="https://ninenines.eu/articles/cowboy-2.7.0/">Cowboy 2.7</a></li>
<li><a href="https://ninenines.eu/articles/gun-2.0.0-pre.1/">Gun 2.0 pre-release 1</a></li>
<li><a href="https://ninenines.eu/articles/gun-2.0.0-pre.2/">Gun 2.0 pre-release 2</a></li>
<li><a href="https://ninenines.eu/articles/erlang-meetup-10-septembre-2019/">Erlang meetup: 10 septembre 2019</a></li>
<li><a href="https://ninenines.eu/articles/ranch-2.0.0-rc.1/">Ranch 2.0 release candidate 1</a></li>
<li><a href="https://ninenines.eu/articles/joe_the_rubber_duck/">Joe Armstrong the rubber duck</a></li>
<li><a href="https://ninenines.eu/articles/merry-christmas-2018/">Merry Christmas 2018: A Recap</a></li>
<li><a href="https://ninenines.eu/articles/cowboy-2.6.0/">Cowboy 2.6</a></li>
<li><a href="https://ninenines.eu/articles/ranch-1.7.0/">Ranch 1.7</a></li>
<li><a href="https://ninenines.eu/articles/cowboy-2.5.0/">Cowboy 2.5</a></li>
<li><a href="https://ninenines.eu/articles/gun-1.3.0/">Gun 1.3</a></li>
<li><a href="https://ninenines.eu/articles/gun-1.2.0/">Gun 1.2</a></li>
<li><a href="https://ninenines.eu/articles/ranch-1.6.0/">Ranch 1.6</a></li>
<li><a href="https://ninenines.eu/articles/gun-1.0.0/">Gun 1.0</a></li>
<li><a href="https://ninenines.eu/articles/asciideck/">Asciideck: Asciidoc for Erlang</a></li>
<li><a href="https://ninenines.eu/articles/gun-1.0.0-rc.1/">Gun 1.0 release candidate 1</a></li>
<li><a href="https://ninenines.eu/articles/cowboy-2.4.0/">Cowboy 2.4</a></li>
<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:[email protected]">email us</a>
if you found any mistake or need clarification on any of the
articles.</p>
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