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<h1 class="lined-header"><span>Gun 2.2</span></h1>
<p class="date">
<span class="year">2025</span>
<span class="day-month">11 Apr</span>
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<p>Gun <code>2.2.0</code> has been released!</p>
<p>Gun 2.2 contains many features and fixes, including an experimental HTTP/3 implementation.</p>
<p>Gun 2.2 is the first release that includes an experimental support for the HTTP/3 protocol. Note that unlike Cowboy, Gun 2.2 does not yet support Websocket over HTTP/3.</p>
<p>Gun 2.2 now sets the appropriate ssl options to perform wildcard certificate matching, which is a requirement for HTTP and previously had to be configured by users.</p>
<p>Gun 2.2 also enables users to send HTTP/2 pings directly, including over tunnels, enabling use cases such as measuring the latency with the server. These pings are separate from the keepalive functionality.</p>
<p>Gun 2.2 also contains various fixes, the most significant of which is a better handling of TLS 1.3 alerts in mTLS scenarios. TLS 1.3 may perform certificate validation after the handshake has completed, leading to the alerts often arriving asynchronously. When an ssl function call returns <code>{error, closed}</code> or equivalent, Gun will now check whether the closure was a result of a TLS alert, and in that case propagate the alert as the error reason to the user. This has also been made to work over tunnels.</p>
<p>HTTP/2 tunneling has also seen a number of improvements.</p>
<p>Gun 2.0 requires Erlang/OTP 24.0 or greater and is tested and supported on Linux, macOS and Windows.</p>
<p>A complete list of changes can be found in the migration guide: <a href="https://ninenines.eu/docs/en/gun/2.2/guide/migrating_from_2.1/">Migrating from Gun 2.1 to 2.2</a>.</p>
<p>I will now focus on implementing HTTP/3 WebTransport in Cowboy and Gun.</p>
<p>You can donate to this project via <a href="https://github.com/sponsors/essen">GitHub Sponsors</a>.</p>
<p>As usual, feedback is appreciated, and issues or questions should be sent via Github tickets. Thanks!</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/gun-2.2.0/">Gun 2.2</a></li>
<li><a href="https://ninenines.eu/articles/cowboy-2.13.0/">Cowboy 2.13</a></li>
<li><a href="https://ninenines.eu/articles/ranch-2.2.0/">Ranch 2.2</a></li>
<li><a href="https://ninenines.eu/articles/cowboy-2.13.0-performance/">Performance improvements in Cowboy 2.13</a></li>
<li><a href="https://ninenines.eu/articles/discord-server/">Erlang OSS Discord server</a></li>
<li><a href="https://ninenines.eu/articles/cowboy-2.12.0/">Cowboy 2.12</a></li>
<li><a href="https://ninenines.eu/articles/cowboy-2.11.0/">Cowboy 2.11</a></li>
<li><a href="https://ninenines.eu/articles/otp-26/">Erlang/OTP 26</a></li>
<li><a href="https://ninenines.eu/articles/gun-2.0.0/">Gun 2.0</a></li>
<li><a href="https://ninenines.eu/articles/ranch-2.1.0/">Ranch 2.1</a></li>
<li><a href="https://ninenines.eu/articles/cowboy-2.9.0/">Cowboy 2.9</a></li>
<li><a href="https://ninenines.eu/articles/gun-2.0.0-rc.1/">Gun 2.0 release candidate 1</a></li>
<li><a href="https://ninenines.eu/articles/ranch-2.0.0/">Ranch 2.0</a></li>
<li><a href="https://ninenines.eu/articles/cowboy-2.8.0/">Cowboy 2.8</a></li>
<li><a href="https://ninenines.eu/articles/the-gateway-trilogy/">The Gateway Trilogy</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/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/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:contact@ninenines.eu">email us</a>
if you found any mistake or need clarification on any of the
articles.</p>
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