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+<title>Reverse Proxy Guide - Apache HTTP Server Version 2.5</title>
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+<p class="apache">Apache HTTP Server Version 2.5</p>
+<img alt="" src="../images/feather.gif" /></div>
+<div class="up"><a href="./"><img title="<-" alt="<-" src="../images/left.gif" /></a></div>
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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="./">How-To / Tutorials</a></div><div id="page-content"><div id="preamble"><h1>Reverse Proxy Guide</h1>
+<div class="toplang">
+<p><span>Available Languages: </span><a href="../en/howto/public_html.html" title="English"> en </a> |
+<a href="../fr/howto/public_html.html" hreflang="fr" rel="alternate" title="Français"> fr </a> |
+<a href="../ja/howto/public_html.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> |
+<a href="../ko/howto/public_html.html" hreflang="ko" rel="alternate" title="Korean"> ko </a> |
+<a href="../tr/howto/public_html.html" hreflang="tr" rel="alternate" title="Türkçe"> tr </a></p>
+</div>
+
+ <p>In addition to being a "basic" web server, and providing static and
+ dynamic content to end-users, Apache httpd (as well as most other web
+ servers) can also act as a reverse proxy server, also-known-as a
+ "gateway" server.</p>
+
+ <p>In such scenarios, httpd itself does not generate or host the data,
+ but rather the content is obtained by one or several backend servers,
+ which normally have no direct connection to the external network. As
+ httpd receives a request from a client, the request itself is <em>proxied</em>
+ to one of these backend servers, which then handles the request, generates
+ the content and then sends this content back to httpd, which then
+ generates the actual HTTP response back to the client.</p>
+
+ <p>There are numerous reasons for such an implementation, but generally
+ the typical rationales are due to security, high-availability, load-balancing
+ and centralized authentication/authorization. It is critical in these
+ implementations that the layout, design and architecture of the backend
+ infrastructure (those servers which actually handle the requests) are
+ insulated and protected from the outside; as far as the client is concerned,
+ the reverse proxy server <em>is</em> the sole source of all content.</p>
+
+ <p>A typical implementation is below: <img src="../images/reverse-proxy-arch.png" alt="reverse-proxy-arch" /></p>
+
+ </div>
+<div id="quickview"><ul id="toc"><li><img alt="" src="../images/down.gif" /> <a href="#related">Reverse Proxy</a></li>
+<li><img alt="" src="../images/down.gif" /> <a href="#userdir">Simple reverse proxying</a></li>
+</ul><ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div>
+<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="related" id="related">Reverse Proxy</a></h2>
+
+ <table class="related"><tr><th>Related Modules</th><th>Related Directives</th></tr><tr><td><ul><li><code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code></li><li><code class="module"><a href="../mod/mod_proxy_balancer.html">mod_proxy_balancer</a></code></li><li><code class="module"><a href="../mod/mod_proxy_hcheck.html">mod_proxy_hcheck</a></code></li></ul></td><td><ul><li><code class="directive"><a href="../mod/mod_proxy.html#proxypass">ProxyPass</a></code></li><li><code class="directive"><a href="../mod/mod_proxy.html#balancermember">BalancerMember</a></code></li></ul></td></tr></table>
+ </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="userdir" id="userdir">Simple reverse proxying</a></h2>
+
+
+ <p>The <code class="directive"><a href="../mod/mod_proxy.html#proxypass">ProxyPass</a></code>
+ directive specifies the mapping of incoming requests to the backend
+ server (or a cluster of servers known as a <code>Balancer</code>
+ group). The simpliest example proxies all requests (<code>"/"</code>)
+ to a single backend:</p>
+
+ <pre class="prettyprint lang-config">ProxyPass "/" "http://www.example.com"</pre>
+
+
+ <p>To ensure that and <code>Location:</code> headers generated from
+ the backend are modified to point to the reverse proxy, instead of
+ back to itself, the <code class="directive"><a href="../mod/mod_proxy.html#proxypassreverse">ProxyPassReverse</a></code>
+ directive is most often required:</p>
+
+ <pre class="prettyprint lang-config"> ProxyPass "/" "http://www.example.com"
+ ProxyPassReverse "/" "http://www.example.com"</pre>
+
+
+ <p>Only specific URIs can be proxied, as shown in this example:</p>
+
+ <pre class="prettyprint lang-config"> ProxyPass "/images" "http://www.example.com"
+ ProxyPassReverse "/images" "http://www.example.com"</pre>
+
+
+ <p>In the above, any requests which start with the <code>/images</code>
+ path with be proxied to the specified backend, otherwise it will be handled
+ locally.</p>
+ </div></div>
+<div class="bottomlang">
+<p><span>Available Languages: </span><a href="../en/howto/public_html.html" title="English"> en </a> |
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+<a href="../ja/howto/public_html.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> |
+<a href="../ko/howto/public_html.html" hreflang="ko" rel="alternate" title="Korean"> ko </a> |
+<a href="../tr/howto/public_html.html" hreflang="tr" rel="alternate" title="Türkçe"> tr </a></p>
+</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 again 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 Freenode, or sent to our <a href="http://httpd.apache.org/lists.html">mailing lists</a>.</div>
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