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<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="viewport" content="width=device-width,initial-scale=1,user-scalable=no" />
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<link rel="stylesheet" href="assets/style.css" type="text/css" />
<title>H2O - the optimized HTTP/2 server</title>
</head>
<body>
<div id="body">
<div id="top">
<h1>
<a href="index.html">H2O</a>
</h1>
<p class="description">the optimized HTTP/1.x, HTTP/2 server</p>
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</div>
<table id="menu">
<tr>
<td class="selected">Top</td>
<td><a href="install.html">Install</a></td>
<td><a href="configure.html">Configure</a></td>
<td><a href="faq.html">FAQ</a></td>
<td><a href="http://blog.kazuhooku.com/search/label/H2O" target="_blank">Blog</a></td>
<td><a href="http://github.com/h2o/h2o/" target="_blank">Source</a></td>
</tr>
</table>
<div id="main">
<div style="margin-top: 3em;">
<p>
H2O is a new generation HTTP server that <b>provides quicker response to users with less CPU utilization</b> when compared to older generation of web servers.
Designed from ground-up, the server takes full advantage of <a href="https://tools.ietf.org/html/rfc7540">HTTP/2</a> features including <a href="configure/http2_directives.html#prioritization">prioritized content serving</a> and <a href="configure/http2_directives.html#server-push">server push</a>, promising outstanding experience to the visitors of your web site.
<div align="center">
<a href="assets/8mbps100msec-nginx195-h2o150.png" target="_blank"><img src="assets/8mbps100msec-nginx195-h2o150.png" width="333" height="250"></a>
<a href="assets/staticfile612-nginx1910-h2o170.png" target="_blank"><img src="assets/staticfile612-nginx1910-h2o170.png" width="200" height="250"></a>
</div>
Explanation of the benchmark charts can be found in the <a href="benchmarks.html">benchmarks</a> page.
<p>
</p>
</div>
<h3>Key Features</h3>
<ul>
<li>HTTP/1.0, HTTP/1.1
<li><a href="configure/http2_directives.html">HTTP/2</a>
<ul>
<li>full support for dependency and weight-based prioritization with <a href="configure/http2_directives.html#http2-reprioritize-blocking-assets">server-side tweaks</a></li>
<li><a href="configure/http2_directives.html#http2-casper">cache-aware server push</a></li>
</ul>
</li>
<li>TCP Fast Open
<li><a href="configure/base_directives.html#listen-ssl">TLS</a>
<ul>
<li>session resumption (standalone & memcached)
<li>session tickets with automatic key rollover
<li>automatic OCSP stapling
<li>forward secrecy & fast AEAD ciphers<sup><a href="#note_1" id="#cite_1" title="chacha20-poly1305: see Do the ChaCha: better mobile performance with cryptography">1</sup></a></sup></li>
<li><a href="configure/base_directives.html#neverbleed">private key protection using privilege separation</a>
</ul>
</li>
<li><a href="configure/file_directives.html">static file serving</a>
<li><a href="configure/fastcgi_directives.html">FastCGI</a>
<li><a href="configure/proxy_directives.html">reverse proxy</a>
<li><a href="configure/mruby.html">scriptable using mruby</a> (Rack-based)
<li>graceful restart and self-upgrade
</ul>
<div class="notes">
<h3>Notes:</h3>
<ol>
<li id="note_1">chacha20-poly1305: see <a href="https://blog.cloudflare.com/do-the-chacha-better-mobile-performance-with-cryptography/">Do the ChaCha: better mobile performance with cryptography</a></li>
</ol>
</div>
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<p>
Copyright © 2015 <a href="http://dena.com/intl/">DeNA Co., Ltd.</a> et al.
</p>
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