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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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<meta content="text/html; charset=UTF-8" http-equiv="Content-Type" />
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<!--
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<title>mod_proxy_express - 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>
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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_express</h1>
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<div class="toplang">
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<p><span>Available Languages: </span><a href="../en/mod/mod_proxy_express.html" title="English"> en </a> |
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<a href="../fr/mod/mod_proxy_express.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>Dynamic mass reverse proxy extension 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>Extension</td></tr>
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<tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>proxy_express_module</td></tr>
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<tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_proxy_express.c</td></tr>
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<tr><th><a href="module-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache 2.3.13 and later</td></tr></table>
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<h3>Summary</h3>
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<p>This module creates dynamically configured mass reverse
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proxies, by mapping the <code>Host:</code> header of the HTTP request to
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a server name and backend URL stored in a DBM file.
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This allows for easy use of a huge number of reverse proxies
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with no configuration changes. It is much less feature-full
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than <code class="module"><a href="../mod/mod_proxy_balancer.html">mod_proxy_balancer</a></code>, which also provides
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dynamic growth, but is intended to handle much, much
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larger numbers of backends. It is ideally suited as a
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front-end HTTP switch and for micro-services architectures.</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>.</p>
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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 class="note"><h3>Limitations</h3>
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<ul>
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<li>This module is not intended to replace the dynamic capability of
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<code class="module"><a href="../mod/mod_proxy_balancer.html">mod_proxy_balancer</a></code>. Instead, it is intended to be mostly
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a lightweight and fast alternative to using <code class="module"><a href="../mod/mod_rewrite.html">mod_rewrite</a></code>
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with <code class="directive"><a href="../mod/mod_rewrite.html#rewritemap">RewriteMap</a></code> and the
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<code>[P]</code> flag for mapped reverse proxying.
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</li>
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<li>It does not support regex or pattern matching at all.
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</li>
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<li>It emulates:
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<pre class="prettyprint lang-config"><VirtualHost *:80>
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ServerName front.end.server
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ProxyPass "/" "back.end.server:port"
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ProxyPassReverse "/" "back.end.server:port"
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</VirtualHost></pre>
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That is, the entire URL is appended to the mapped backend
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URL. This is in keeping with the intent of being a simple
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but fast reverse proxy switch.
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</li>
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</ul>
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</div>
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</div>
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<div id="quickview"><h3 class="directives">Directives</h3>
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<ul id="toc">
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<li><img alt="" src="../images/down.gif" /> <a href="#proxyexpressdbmfile">ProxyExpressDBMFile</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#proxyexpressdbmtype">ProxyExpressDBMType</a></li>
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<li><img alt="" src="../images/down.gif" /> <a href="#proxyexpressenable">ProxyExpressEnable</a></li>
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</ul>
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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_express">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&component=mod_proxy_express">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_proxy.html">mod_proxy</a></code></li>
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<li><code class="directive"><a href="../mod/mod_proxy.html#balancermember">BalancerMember</a></code></li>
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<li><code class="directive"><a href="../mod/mod_proxy.html#balancergrowth">BalancerGrowth</a></code></li>
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<li><code class="directive"><a href="../mod/mod_proxy.html#balancerpersist">BalancerPersist</a></code></li>
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<li><code class="directive"><a href="../mod/mod_proxy.html#balancerinherit">BalancerInherit</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="directive-section"><h2><a name="ProxyExpressDBMFile" id="ProxyExpressDBMFile">ProxyExpressDBMFile</a> <a name="proxyexpressdbmfile" id="proxyexpressdbmfile">Directive</a> <a title="Permanent link" href="#proxyexpressdbmfile" class="permalink">¶</a></h2>
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<table class="directive">
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<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Pathname to DBM file.</td></tr>
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<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ProxyExpressDBMFile <var>pathname</var></code></td></tr>
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<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
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<tr><th><a href="directive-dict.html#Override">Override:</a></th><td>FileInfo</td></tr>
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<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
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<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_proxy_express</td></tr>
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</table>
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<p>The <code class="directive">ProxyExpressDBMFile</code> directive
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points to the location of the Express map DBM file. This
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file serves to map the incoming server name, obtained from
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the <code>Host:</code> header, to a backend URL.</p>
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<div class="note"><h3>Note</h3>
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<p>The file is constructed from a plain text file format using
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the <code><a href="../programs/httxt2dbm.html">httxt2dbm</a></code>
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utility.</p>
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<div class="example"><h3>ProxyExpress map file</h3><p><code>
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##<br />
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##express-map.txt:<br />
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##<br />
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<br />
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www1.example.com http://192.168.211.2:8080<br />
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www2.example.com http://192.168.211.12:8088<br />
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www3.example.com http://192.168.212.10<br />
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</code></p></div>
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<div class="example"><h3>Create DBM file</h3><p><code>
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httxt2dbm -i express-map.txt -o emap<br />
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</code></p></div>
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<div class="example"><h3>Configuration</h3><pre class="prettyprint lang-config">ProxyExpressEnable on
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ProxyExpressDBMFile emap</pre>
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</div>
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</div>
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</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="directive-section"><h2><a name="ProxyExpressDBMType" id="ProxyExpressDBMType">ProxyExpressDBMType</a> <a name="proxyexpressdbmtype" id="proxyexpressdbmtype">Directive</a> <a title="Permanent link" href="#proxyexpressdbmtype" class="permalink">¶</a></h2>
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<table class="directive">
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<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>DBM type of file.</td></tr>
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<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ProxyExpressDBMType <var>type</var></code></td></tr>
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<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ProxyExpressDBMType default</code></td></tr>
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<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
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<tr><th><a href="directive-dict.html#Override">Override:</a></th><td>FileInfo</td></tr>
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<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
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<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_proxy_express</td></tr>
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</table>
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<p>The <code class="directive">ProxyExpressDBMType</code> directive
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controls the DBM type expected by the module. The default
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is the default DBM type created with <code>
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<a href="../programs/httxt2dbm.html">httxt2dbm</a></code>.</p>
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<p>Possible values are (not all may be available at run time):</p>
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<table class="bordered"><tr class="header"><th>Value</th><th>Description</th></tr>
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<tr><td><code>db</code></td><td> Berkeley DB files</td></tr>
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<tr class="odd"><td><code>gdbm</code></td><td> GDBM files</td></tr>
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<tr><td><code>ndbm</code></td><td> NDBM files</td></tr>
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<tr class="odd"><td><code>sdbm</code></td><td> SDBM files (always available)</td></tr>
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<tr><td><code>default</code></td><td> default DBM type</td></tr>
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</table>
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</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="directive-section"><h2><a name="ProxyExpressEnable" id="ProxyExpressEnable">ProxyExpressEnable</a> <a name="proxyexpressenable" id="proxyexpressenable">Directive</a> <a title="Permanent link" href="#proxyexpressenable" class="permalink">¶</a></h2>
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<table class="directive">
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<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enable the module functionality.</td></tr>
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<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ProxyExpressEnable on|off</code></td></tr>
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<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>ProxyExpressEnable off</code></td></tr>
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<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
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<tr><th><a href="directive-dict.html#Override">Override:</a></th><td>FileInfo</td></tr>
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<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
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<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_proxy_express</td></tr>
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</table>
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<p>The <code class="directive">ProxyExpressEnable</code> directive
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controls whether the module will be active.</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_express.html" title="English"> en </a> |
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<a href="../fr/mod/mod_proxy_express.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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