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<?xml version="1.0" encoding="ISO-8859-1"?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head><!-- XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX This file is generated from xml source: DO NOT EDIT XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX --><title>mod_ext_filter - Apache HTTP Server</title><link href="../style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" /><link href="../style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" /><link href="../style/css/manual-print.css" rel="stylesheet" media="print" type="text/css" /><link href="../images/favicon.ico" rel="shortcut icon" /></head><body><div id="page-header"><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><p class="apache">Apache HTTP Server Version 2.0</p><img alt="" src="../images/feather.gif" /></div><div class="up"><a href="./"><img title="<-" alt="<-" src="../images/left.gif" /></a></div><div id="path"><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 2.0</a> > <a href="./">Modules</a></div><div id="page-content"><div id="preamble"><h1>Apache Module mod_ext_filter</h1><div class="toplang"><p><span>Available Languages: </span><a href="../en/mod/mod_ext_filter.html" title="English"> en </a> |<a href="../ko/mod/mod_ext_filter.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p></div><table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Pass the response body through an external program beforedelivery to the client</td></tr><tr><th><a href="module-dict.html#Status">Status:</a></th><td>Extension</td></tr><tr><th><a href="module-dict.html#ModuleIdentifier">Module營dentifier:</a></th><td>ext_filter_module</td></tr><tr><th><a href="module-dict.html#SourceFile">Source燜ile:</a></th><td>mod_ext_filter.c</td></tr></table><h3>Summary</h3> <p><code class="module"><a href="../mod/mod_ext_filter.html">mod_ext_filter</a></code> presents a simple and familiar programming model for <a href="../filter.html">filters</a>. With this module, a program which reads from stdin and writes to stdout (i.e., a Unix-style filter command) can be a filter for Apache. This filtering mechanism is much slower than using a filter which is specially written for the Apache API and runs inside of the Apache server process, but it does have the following benefits:</p> <ul> <li>the programming model is much simpler</li> <li>any programming/scripting language can be used, provided that it allows the program to read from standard input and write to standard output</li> <li>existing programs can be used unmodified as Apache filters</li> </ul> <p>Even when the performance characteristics are not suitable for production use, <code class="module"><a href="../mod/mod_ext_filter.html">mod_ext_filter</a></code> can be used as a prototype environment for filters.</p></div><div id="quickview"><h3 class="directives">Directives</h3><ul id="toc"><li><img alt="" src="../images/down.gif" /> <a href="#extfilterdefine">ExtFilterDefine</a></li><li><img alt="" src="../images/down.gif" /> <a href="#extfilteroptions">ExtFilterOptions</a></li></ul><h3>Topics</h3><ul id="topics"><li><img alt="" src="../images/down.gif" /> <a href="#examples">Examples</a></li></ul><h3>See also</h3><ul class="seealso"><li><a href="../filter.html">Filters</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="examples" id="examples">Examples</a></h2> <h3>Generating HTML from some other type of response</h3> <div class="example"><p><code> # mod_ext_filter directive to define a filter<br /> # to HTML-ize text/c files using the external<br /> # program /usr/bin/enscript, with the type of<br /> # the result set to text/html<br /> ExtFilterDefine c-to-html mode=output \<br /> <span class="indent"> intype=text/c outtype=text/html \<br /> cmd="/usr/bin/enscript --color -W html -Ec -o - -"<br /> </span> <br /> <Directory "/export/home/trawick/apacheinst/htdocs/c"><br /> <span class="indent"> # core directive to cause the new filter to<br /> # be run on output<br /> SetOutputFilter c-to-html<br /> <br /> # mod_mime directive to set the type of .c<br /> # files to text/c<br /> AddType text/c .c<br /> <br /> # mod_ext_filter directive to set the debug<br /> # level just high enough to see a log message<br /> # per request showing the configuration in force<br /> ExtFilterOptions DebugLevel=1<br /> </span> </Directory> </code></p></div> <h3>Implementing a content encoding filter</h3> <p>Note: this gzip example is just for the purposes of illustration. Please refer to <code class="module"><a href="../mod/mod_deflate.html">mod_deflate</a></code> for a practical implementation.</p> <div class="example"><p><code> # mod_ext_filter directive to define the external filter<br /> ExtFilterDefine gzip mode=output cmd=/bin/gzip<br /> <br /> <Location /gzipped><br /> <span class="indent"> # core directive to cause the gzip filter to be<br /> # run on output<br /> SetOutputFilter gzip<br /> <br /> # mod_header directive to add<br /> # "Content-Encoding: gzip" header field<br /> Header set Content-Encoding gzip<br /> </span> </Location> </code></p></div> <h3>Slowing down the server</h3> <div class="example"><p><code> # mod_ext_filter directive to define a filter<br /> # which runs everything through cat; cat doesn't<br /> # modify anything; it just introduces extra pathlength<br /> # and consumes more resources<br /> ExtFilterDefine slowdown mode=output cmd=/bin/cat \<br /> <span class="indent"> preservescontentlength<br /> </span> <br /> <Location /><br /> <span class="indent"> # core directive to cause the slowdown filter to<br /> # be run several times on output<br /> #<br /> SetOutputFilter slowdown;slowdown;slowdown<br /> </span> </Location> </code></p></div> <h3>Using sed to replace text in the response</h3> <div class="example"><p><code> # mod_ext_filter directive to define a filter which<br /> # replaces text in the response<br /> #<br /> ExtFilterDefine fixtext mode=output intype=text/html \<br /> <span class="indent"> cmd="/bin/sed s/verdana/arial/g"<br /> </span> <br /> <Location /><br /> <span class="indent"> # core directive to cause the fixtext filter to<br /> # be run on output<br /> SetOutputFilter fixtext<br /> </span> </Location> </code></p></div> <h3>Tracing another filter</h3> <div class="example"><p><code> # Trace the data read and written by mod_deflate<br /> # for a particular client (IP 192.168.1.31)<br /> # experiencing compression problems.<br /> # This filter will trace what goes into mod_deflate.<br /> ExtFilterDefine tracebefore \<br /> <span class="indent"> cmd="/bin/tracefilter.pl /tmp/tracebefore" \<br /> EnableEnv=trace_this_client<br /> </span> <br /> # This filter will trace what goes after mod_deflate.<br /> # Note that without the ftype parameter, the default<br /> # filter type of AP_FTYPE_RESOURCE would cause the<br /> # filter to be placed *before* mod_deflate in the filter<br /> # chain. 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