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<title>Nine Nines: Introduction</title>
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<h1 class="lined-header"><span>Introduction</span></h1>
<p>Gun is an HTTP client for Erlang/OTP.</p>
<p>Gun supports the HTTP/2, HTTP/1.1 and Websocket protocols.</p>
<h2 id="_prerequisites">Prerequisites</h2>
<p>Knowledge of Erlang, but also of the HTTP/1.1, HTTP/2 and Websocket protocols is required in order to read this guide.</p>
<h2 id="_supported_platforms">Supported platforms</h2>
<p>Gun is tested and supported on Linux, FreeBSD, Windows and OSX.</p>
<p>Gun is developed for Erlang/OTP 22.0 and newer.</p>
<h2 id="_license">License</h2>
<p>Gun uses the ISC License.</p>
<div class="listingblock"><div class="content"><pre>Copyright (c) 2013-2019, Loïc Hoguin <[email protected]>
Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.</pre></div></div>
<h2 id="_versioning">Versioning</h2>
<p>Gun uses <a href="http://semver.org/">Semantic Versioning 2.0.0</a>.</p>
<h2 id="_conventions">Conventions</h2>
<p>In the HTTP protocol, the method name is case sensitive. All standard method names are uppercase.</p>
<p>Header names are case insensitive. Gun converts all the header names to lowercase, including request headers provided by your application.</p>
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<p>Donate to Loïc Hoguin because his work on Cowboy, Ranch, Gun and Erlang.mk is fantastic:</p>
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