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170 lines
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head>
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<meta content="text/html; charset=UTF-8" http-equiv="Content-Type" />
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This file is generated from xml source: DO NOT EDIT
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XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
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-->
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<title>mod_proxy_http2 - Apache HTTP Server Version 2.5</title>
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<link href="../style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" />
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<link href="../style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" />
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<script src="../style/scripts/prettify.min.js" type="text/javascript">
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</script>
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<link href="../images/favicon.ico" rel="shortcut icon" /></head>
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<body>
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<div id="page-header">
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<p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/quickreference.html">Directives</a> | <a href="http://wiki.apache.org/httpd/FAQ">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p>
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<p class="apache">Apache HTTP Server Version 2.5</p>
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<img alt="" src="../images/feather.png" /></div>
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<div class="up"><a href="./"><img title="<-" alt="<-" src="../images/left.gif" /></a></div>
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<div id="path">
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<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="../">Version 2.5</a> > <a href="./">Modules</a></div>
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<div id="page-content">
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<div id="preamble"><h1>Apache Module mod_proxy_http2</h1>
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<div class="toplang">
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<p><span>Available Languages: </span><a href="../en/mod/mod_proxy_http2.html" title="English"> en </a> |
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<a href="../fr/mod/mod_proxy_http2.html" hreflang="fr" rel="alternate" title="Français"> fr </a></p>
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</div>
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<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>HTTP/2 support module for
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<code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code></td></tr>
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<tr><th><a href="module-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
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<tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>proxy_http2_module</td></tr>
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<tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_proxy_http2.c</td></tr>
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<tr><th><a href="module-dict.html#Compatibility">Compatibility:</a></th><td>Available in httpd 2.4.19 and later</td></tr></table>
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<h3>Summary</h3>
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<p><code class="module"><a href="../mod/mod_proxy_http2.html">mod_proxy_http2</a></code>
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supports HTTP/2 only, it does <em>not</em>
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provide any downgrades to HTTP/1.1. This means that the backend
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needs to support HTTP/2 because HTTP/1.1 will not be used instead.</p>
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<p>This module <em>requires</em> the service of <code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code>, so in order to get the ability of
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handling HTTP/2 proxy requests,
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<code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code> and <code class="module"><a href="../mod/mod_proxy_http2.html">mod_proxy_http2</a></code>
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need to be both loaded by the server.</p>
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<p><code class="module"><a href="../mod/mod_proxy_http2.html">mod_proxy_http2</a></code> works with incoming fronted requests
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using HTTP/1.1 or HTTP/2. In both cases, requests proxied
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to the same backend are sent over a single TCP connection
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whenever possible (namely when the connection can be re-used).</p>
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<p>Caveat: there will be no attempt to consolidate multiple HTTP/1.1
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frontend requests (configured to be proxied to the same backend)
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into HTTP/2 streams belonging to the same HTTP/2 request.
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Each HTTP/1.1 frontend request will be proxied to the backend using
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a separate HTTP/2 request (trying to re-use the same TCP connection
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if possible).</p>
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<p>This module relies on <a href="http://nghttp2.org/">libnghttp2</a>
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to provide the core http/2 engine.</p>
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<div class="warning"><h3>Warning</h3>
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<p>This module is experimental. Its behaviors, directives, and
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defaults are subject to more change from release to
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release relative to other standard modules. Users are encouraged to
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consult the "CHANGES" file for potential updates.</p>
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</div>
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<div class="warning"><h3>Warning</h3>
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<p>Do not enable proxying until you have <a href="mod_proxy.html#access">secured your server</a>. Open proxy
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servers are dangerous both to your network and to the Internet at
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large.</p>
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</div>
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</div>
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<div id="quickview"><h3>Topics</h3>
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<ul id="topics">
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<li><img alt="" src="../images/down.gif" /> <a href="#examples">Basic Examples</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#notes">Request notes</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#h2push">HTTP/2 PUSH</a></li>
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</ul><h3 class="directives">Directives</h3>
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<p>This module provides no
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directives.</p>
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<h3>Bugfix checklist</h3><ul class="seealso"><li><a href="https://www.apache.org/dist/httpd/CHANGES_2.4">httpd changelog</a></li><li><a href="https://bz.apache.org/bugzilla/buglist.cgi?bug_status=__open__&list_id=144532&product=Apache%20httpd-2&query_format=specific&order=changeddate%20DESC%2Cpriority%2Cbug_severity&component=mod_proxy_http2">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&component=mod_proxy_http2">Report a bug</a></li></ul><h3>See also</h3>
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<ul class="seealso">
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<li><code class="module"><a href="../mod/mod_http2.html">mod_http2</a></code></li>
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<li><code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code></li>
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<li><code class="module"><a href="../mod/mod_proxy_connect.html">mod_proxy_connect</a></code></li>
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<li><a href="#comments_section">Comments</a></li></ul></div>
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<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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<div class="section">
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<h2><a name="examples" id="examples">Basic Examples</a> <a title="Permanent link" href="#examples" class="permalink">¶</a></h2>
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<p>The examples below demonstrate how to configure HTTP/2 for
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backend connections for a reverse proxy. </p>
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<div class="example"><h3>HTTP/2 (TLS)</h3><pre class="prettyprint lang-config">ProxyPass "/app" "h2://app.example.com"
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ProxyPassReverse "/app" "https://app.example.com"</pre>
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</div>
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<div class="example"><h3>HTTP/2 (cleartext)</h3><pre class="prettyprint lang-config">ProxyPass "/app" "h2c://app.example.com"
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ProxyPassReverse "/app" "http://app.example.com"</pre>
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</div>
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<div class="note">
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<p>The schemes to configure above in
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<code class="directive">ProxyPassReverse</code> for reverse proxying
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<code>h2</code> (or <code>h2c</code>) protocols are the usual
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<code>https</code> (resp. <code>http</code>) as expected/used by
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the user agent.</p>
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</div>
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</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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<div class="section">
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<h2><a name="notes" id="notes">Request notes</a> <a title="Permanent link" href="#notes" class="permalink">¶</a></h2>
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<p><code class="module"><a href="../mod/mod_proxy_http.html">mod_proxy_http</a></code> creates the following request notes for
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logging using the <code>%{VARNAME}n</code> format in
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<code class="directive"><a href="../mod/mod_log_config.html#logformat">LogFormat</a></code> or
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<code class="directive"><a href="../mod/core.html#errorlogformat">ErrorLogFormat</a></code>:
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</p>
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<dl>
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<dt>proxy-source-port</dt>
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<dd>The local port used for the connection to the backend server.</dd>
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<dt>proxy-status</dt>
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<dd>The HTTP/2 status received from the backend server.</dd>
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</dl>
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</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
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<div class="section">
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<h2><a name="h2push" id="h2push">HTTP/2 PUSH</a> <a title="Permanent link" href="#h2push" class="permalink">¶</a></h2>
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<p>The module does not support the HTTP/2 feature PUSH. Backend servers
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that would like to advertise preload resources should send the appropriate
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<code>Link</code> headers.</p>
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<p>If available, they may do so using the <code>"103 Early Hints"</code>
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intermediate responses as specified in
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<a href="https://tools.ietf.org/html/rfc8297">RFC 8297</a>. This will give
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the best performance. If the client is talking HTTP/2 as well, this may
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then result in a PUSH from Apache to the client or just in forwarding
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the 103 response.</p>
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</div>
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</div>
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<div class="bottomlang">
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<p><span>Available Languages: </span><a href="../en/mod/mod_proxy_http2.html" title="English"> en </a> |
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<a href="../fr/mod/mod_proxy_http2.html" hreflang="fr" rel="alternate" title="Français"> fr </a></p>
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</div><div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div><div class="section"><h2><a id="comments_section" name="comments_section">Comments</a></h2><div class="warning"><strong>Notice:</strong><br />This is not a Q&A section. Comments placed here should be pointed towards suggestions on improving the documentation or server, and may be removed by our moderators if they are either implemented or considered invalid/off-topic. Questions on how to manage the Apache HTTP Server should be directed at either our IRC channel, #httpd, on Libera.chat, or sent to our <a href="https://httpd.apache.org/lists.html">mailing lists</a>.</div>
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<p class="apache">Copyright 2023 The Apache Software Foundation.<br />Licensed under the <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache License, Version 2.0</a>.</p>
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<p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/quickreference.html">Directives</a> | <a href="http://wiki.apache.org/httpd/FAQ">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p></div><script type="text/javascript"><!--//--><![CDATA[//><!--
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