update transformation

</p>

<p>Some examples of filtering in the standard Apache distribution are:</p>

<ul>

<li>mod_includes, implements server-side includes.</li>

<li>mod_ssl, implements SSL encryption (https).</li>

<li>mod_deflate, implements compression/decompression on the fly.</li>

<li>mod_charset_lite, transcodes between different character sets.</li>

<li>mod_ext_filter, runs an external program as a filter.</li>

<li><code class="module"><a href="./mod/mod_include.html">mod_include</a></code>, implements server-side includes.</li>

<li><code class="module"><a href="./mod/mod_ssl.html">mod_ssl</a></code>, implements SSL encryption (https).</li>

<li><code class="module"><a href="./mod/mod_deflate.html">mod_deflate</a></code>, implements compression/decompression on the fly.</li>

<li><code class="module"><a href="./mod/mod_charset_lite.html">mod_charset_lite</a></code>, transcodes between different character sets.</li>

<li><code class="module"><a href="./mod/mod_ext_filter.html">mod_ext_filter</a></code>, runs an external program as a filter.</li>

</ul>

<p>Apache also uses a number of filters internally, to perform

<p>Apache also uses a number of filters internally to perform

functions like chunking and byte-range handling.</p>

<p>A wider range of applications are implemented by third-party

filter modules.  A few of these are:</p>

<p>A wider range of applications are implemented by third-party filter

modules available from <a href="http://modules.apache.org/">modules.apache.org</a> and

elsewhere.  A few of these are:</p>

<ul>

<li>HTML and XML processing and rewriting</li>

<li>XSLT transforms and XIncludes</li>

<li>an HTML processing filter will only run if the content is

text/html or application/xhtml+xml</li>

<li>A compression filter will only run if the input is a

compressable type and not already compressed</li>

compressible type and not already compressed</li>

<li>A charset conversion filter will be inserted if a text

document is not already in the desired charset</li>

</ul>

<h2><a name="using" id="using">Using Filters</a></h2>

<p>There are two ways to use filtering: Simple and Dynamic.

In general, you should use one or the other: mixing them can

In general, you should use one or the other; mixing them can

have unexpected consequences (although simple Input filtering

can be mixed freely with either simple or dynamic Output filtering!</p>

can be mixed freely with either simple or dynamic Output filtering).</p>

<p>The Simple Way is the only way to configure input filters, and is

suficient for output filters where you need a static filter chain.

sufficient for output filters where you need a static filter chain.

Relevant directives are

    <code class="directive"><a href="./mod/core.html#setinputfilter">SetInputFilter</a></code>,

    <code class="directive"><a href="./mod/core.html#setoutputfilter">SetOutputFilter</a></code>,

of output filters, as discussed in the <code class="module"><a href="./mod/mod_filter.html">mod_filter</a></code> page.

Relevant directives are

    <code class="directive"><a href="./mod/mod_filter.html#filterchain">FilterChain</a></code>,

    <code class="directive"><a href="./mod/mod_filter.html#filterdeclare">FilterDeclare</a></code>,

    <code class="directive"><a href="./mod/mod_filter.html#filterdeclare">FilterDeclare</a></code>, and

    <code class="directive"><a href="./mod/mod_filter.html#filterprovider">FilterProvider</a></code>.</p>

<p>One further directive AddOutputFilterByType is still supported,

but may be problematic and is now deprecated.  Use dynamic configuration

instead.</p>

<p>One further directive <code class="directive"><a href="./mod/core.html#addoutputfilterbytype">AddOutputFilterByType</a></code> is still supported,

but may be problematic and is now deprecated.  Use dynamic

configuration instead.</p>

  </div></div>

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