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2cd0c839a5
to fix hard-coded URLs in HTML. git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@933559 13f79535-47bb-0310-9956-ffa450edef68
130 lines
7.3 KiB
XML
130 lines
7.3 KiB
XML
<?xml version="1.0" encoding="ISO-8859-1"?>
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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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XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
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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_substitute - Apache HTTP Server</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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<link href="../style/css/manual-print.css" rel="stylesheet" media="print" type="text/css" />
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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/directives.html">Directives</a> | <a href="../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 2.3</p>
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<img alt="" src="../images/feather.gif" /></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 2.3</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_substitute</h1>
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<div class="toplang">
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<p><span>Available Languages: </span><a href="../en/mod/mod_substitute.html" title="English"> en </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>Perform search and replace operations on response bodies</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<EFBFBD>Identifier:</a></th><td>substitute_module</td></tr>
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<tr><th><a href="module-dict.html#SourceFile">Source<EFBFBD>File:</a></th><td>mod_substitute.c</td></tr>
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<tr><th><a href="module-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache HTTP Server 2.2.7 and later</td></tr></table>
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<h3>Summary</h3>
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<p><code class="module"><a href="../mod/mod_substitute.html">mod_substitute</a></code> provides a mechanism to perform
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both regular expression and fixed string substitutions on
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response bodies.</p>
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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="#substitute">Substitute</a></li>
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</ul>
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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="Substitute" id="Substitute">Substitute</a> <a name="substitute" id="substitute">Directive</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>Pattern to filter the response content</td></tr>
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<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>Substitute <var>s/pattern/substitution/[infq]</var></code></td></tr>
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<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>directory, .htaccess</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>Experimental</td></tr>
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<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_substitute</td></tr>
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</table>
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<p>The <code class="directive">Substitute</code> directive specifies a
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search and replace pattern to apply to the response body.</p>
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<p>The meaning of the pattern can be modified by using any
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combination of these flags:</p>
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<dl>
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<dt><code>i</code></dt>
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<dd>Perform a case-insensitive match.</dd>
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<dt><code>n</code></dt>
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<dd>By default the pattern is treated as a regular expression.
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Using the <code>n</code> flag forces the pattern to be treated
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as a fixed string.</dd>
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<dt><code>f</code></dt>
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<dd>The <code>f</code> flag causes mod_substitute to flatten the
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result of a substitution allowing for later substitutions to
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take place on the boundary of this one. This is the default.</dd>
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<dt><code>q</code></dt>
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<dd>The <code>q</code> flag causes mod_substitute to not
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flatten the buckets after each substitution. This can
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result in much faster response and a decrease in memory
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utilization, but should only be used if there is no possibility
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that the result of one substitution will ever match a pattern
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or regex of a subsequent one.</dd>
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</dl>
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<div class="example"><h3>Example</h3><p><code>
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<Location />
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<span class="indent">
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AddOutputFilterByType SUBSTITUTE text/html<br />
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Substitute s/foo/bar/ni<br />
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</span>
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</Location>
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</code></p></div>
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<p>If either the pattern or the substitution contain a slash
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character then an alternative delimiter should be used:</p>
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<div class="example"><h3>Example of using an alternate delimiter</h3><p><code>
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<Location />
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<span class="indent">
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AddOutputFilterByType SUBSTITUTE text/html<br />
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Substitute "s|<BR */?>|<br />|i"
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</span>
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</Location>
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</code></p></div>
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<p>A common use scenario for <code>mod_substitute</code> is the
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situation in which a front-end server proxies requests to a back-end
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server which returns HTML with hard-coded embedded URLs that refer
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to the back-end server. These URLs don't work for the end-user,
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since the back-end server is unreachable.</p>
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<p>In this case, <code>mod_substutite</code> can be used to rewrite
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those URLs into something that will work from the front end:</p>
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<div class="example"><h3>Rewriting URLs embedded in proxied content</h3><p><code>
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ProxyPass /blog/ http://internal.blog.example.com<br />
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ProxyPassReverse /blog/ http://internal.blog.example.com/<br />
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<br />
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Substitute "s|http://internal.blog.example.com/|http://www.example.com/blog/|i"
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</code></p></div>
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<p><code class="directive"><a href="../mod/mod_proxy.html#proxypassreverse">ProxyPassReverse</a></code>
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modifies any <code>Location</code> (redirect) headers that are sent
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by the back-end server, and, in this example,
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<code>Substitute</code> takes care of the rest of the problem by
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fixing up the HTML response as well.</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_substitute.html" title="English"> en </a></p>
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</div><div id="footer">
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<p class="apache">Copyright 2010 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/directives.html">Directives</a> | <a href="../faq/">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p></div>
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</body></html> |