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<div id="page-content"><div id="preamble"><h1>Apache模块 mod_ext_filter</h1>
<table border="1" cellpadding="0" cellspacing="0" bordercolor="#AAAAAA" class="module">
<tr><th><a href="module-dict.html#Description">说明</a></th><td>使用外部程序作为过滤器</td></tr>
<tr><th><a href="module-dict.html#Status">状态</a></th><td>扩展(E)</td></tr>
<tr><th><a href="module-dict.html#ModuleIdentifier">模块名</a></th><td>ext_filter_module</td></tr>
<tr><th><a href="module-dict.html#SourceFile">源文件</a></th><td>mod_ext_filter.c</td></tr>
</table>
<h3>概述</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">过滤器</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>
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<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. Giving it a numeric value slightly higher than<br />
# AP_FTYPE_CONTENT_SET will ensure that it is placed<br />
# after mod_deflate.<br />
ExtFilterDefine traceafter \<br />
<span class="indent">
cmd="/bin/tracefilter.pl /tmp/traceafter" \<br />
EnableEnv=trace_this_client ftype=21<br />
</span>
<br />
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