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<title>mod_filter - Apache HTTP Server</title>
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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>
<p class="apache">Apache HTTP Server Version 2.1</p>
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<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-project/">Documentation</a> > <a href="../">Version 2.1</a> > <a href="./">Modules</a></div>
<div id="page-content">
</div>
<div id="quickview"><h3 class="directives">Directives</h3>
<ul id="toc">
-<li><img
src="../images/down.gif" alt="" /> <a href="#filterchain">FilterChain</a></li>
-<li><img
src="../images/down.gif" alt="" /> <a href="#filterdeclare">FilterDeclare</a></li>
-<li><img
src="../images/down.gif" alt="" /> <a href="#filterprotocol">FilterProtocol</a></li>
-<li><img
src="../images/down.gif" alt="" /> <a href="#filterprovider">FilterProvider</a></li>
-<li><img
src="../images/down.gif" alt="" /> <a href="#filtertrace">FilterTrace</a></li>
+<li><img
alt="" src="../images/down.gif" /> <a href="#filterchain">FilterChain</a></li>
+<li><img
alt="" src="../images/down.gif" /> <a href="#filterdeclare">FilterDeclare</a></li>
+<li><img
alt="" src="../images/down.gif" /> <a href="#filterprotocol">FilterProtocol</a></li>
+<li><img
alt="" src="../images/down.gif" /> <a href="#filterprovider">FilterProvider</a></li>
+<li><img
alt="" src="../images/down.gif" /> <a href="#filtertrace">FilterTrace</a></li>
</ul>
<h3>Topics</h3>
<ul id="topics">
-<li><img
src="../images/down.gif" alt="" /> <a href="#smart">Smart Filtering</a></li>
-<li><img
src="../images/down.gif" alt="" /> <a href="#terms">Filter Declarations, Providers and Chains</a></li>
-<li><img
src="../images/down.gif" alt="" /> <a href="#config">Configuring the Chain</a></li>
-<li><img
src="../images/down.gif" alt="" /> <a href="#examples">Examples</a></li>
-<li><img
src="../images/down.gif" alt="" /> <a href="#protocol">Protocol Handling</a></li>
+<li><img
alt="" src="../images/down.gif" /> <a href="#smart">Smart Filtering</a></li>
+<li><img
alt="" src="../images/down.gif" /> <a href="#terms">Filter Declarations, Providers and Chains</a></li>
+<li><img
alt="" src="../images/down.gif" /> <a href="#config">Configuring the Chain</a></li>
+<li><img
alt="" src="../images/down.gif" /> <a href="#examples">Examples</a></li>
+<li><img
alt="" src="../images/down.gif" /> <a href="#protocol">Protocol Handling</a></li>
</ul></div>
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+<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
-<h2><a id="smart" name="smart">Smart Filtering</a></h2>
+<h2><a name="smart" id="smart">Smart Filtering</a></h2>
<p>In the traditional filtering model, filters are inserted unconditionally
using <code class="directive"><a href="../mod/mod_mime.html#addoutputfilter">AddOutputFilter</a></code> and family.
Each filter then needs to determine whether to run, and there is little
content generator. The ability to dispatch based on Environment
Variables offers the full flexibility of configuration with
<code class="module"><a href="../mod/mod_rewrite.html">mod_rewrite</a></code> to anyone who needs it.</p>
-</div><div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div>
+</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
-<h2><a id="terms" name="terms">Filter Declarations, Providers and Chains</a></h2>
+<h2><a name="terms" id="terms">Filter Declarations, Providers and Chains</a></h2>
<p class="figure">
<img src="../images/mod_filter_old.gif" width="160" height="310" alt="[This image displays the traditional filter model]" /><br />
<dfn>Figure 1:</dfn> The traditional filter model</p>
harness, each of which may have any number of providers. A special
case is that of a single provider with unconditional dispatch: this
is equivalent to inserting the provider filter directly into the chain.</p>
-</div><div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div>
+</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
-<h2><a id="config" name="config">Configuring the Chain</a></h2>
+<h2><a name="config" id="config">Configuring the Chain</a></h2>
<p>There are three stages to configuring a filter chain with
<code class="module"><a href="../mod/mod_filter.html">mod_filter</a></code>. For details of the directives, see below.</p>
filters declared, offering the flexibility to insert filters at the
beginning or end of the chain, remove a filter, or clear the chain.</dd>
</dl>
-</div><div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div>
+</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
-<h2><a id="examples" name="examples">Examples</a></h2>
+<h2><a name="examples" id="examples">Examples</a></h2>
<dl>
<dt>Server side Includes (SSI)</dt>
<dd>A simple case of using <code class="module"><a href="../mod/mod_filter.html">mod_filter</a></code> in place of
</code></p></div>
</dd>
</dl>
-</div><div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div>
+</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
-<h2><a id="protocol" name="protocol">Protocol Handling</a></h2>
+<h2><a name="protocol" id="protocol">Protocol Handling</a></h2>
<p>Historically, each filter is responsible for ensuring that whatever
changes it makes are correctly represented in the HTTP response headers,
and that it does not run when it would make an illegal change. This
default (i.e. in the absence of any <code class="directive"><a href="#filterprotocol">FilterProtocol</a></code> directives), <code class="module"><a href="../mod/mod_filter.html">mod_filter</a></code>
will leave the headers untouched.</p>
</div>
-<div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div>
-<div class="directive-section"><h2><a id="FilterChain" name="FilterChain">FilterChain</a> <a id="filterchain" name="filterchain">Directive</a></h2>
+<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="directive-section"><h2><a name="FilterChain" id="FilterChain">FilterChain</a> <a name="filterchain" id="filterchain">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Configure the filter chain</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>FilterChain [+=-@!]<var>filter-name</var> <var>...</var></code></td></tr>
</dl>
</div>
-<div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div>
-<div class="directive-section"><h2><a id="FilterDeclare" name="FilterDeclare">FilterDeclare</a> <a id="filterdeclare" name="filterdeclare">Directive</a></h2>
+<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="directive-section"><h2><a name="FilterDeclare" id="FilterDeclare">FilterDeclare</a> <a name="filterdeclare" id="filterdeclare">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Declare a smart filter</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>FilterDeclare <var>filter-name</var> <var>[type]</var></code></td></tr>
or <code>NETWORK</code>.</p>
</div>
-<div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div>
-<div class="directive-section"><h2><a id="FilterProtocol" name="FilterProtocol">FilterProtocol</a> <a id="filterprotocol" name="filterprotocol">Directive</a></h2>
+<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="directive-section"><h2><a name="FilterProtocol" id="FilterProtocol">FilterProtocol</a> <a name="filterprotocol" id="filterprotocol">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Deal with correct HTTP protocol handling</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>FilterProtocol <var>filter-name</var> [<var>provider-name</var>]
</dl>
</div>
-<div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div>
-<div class="directive-section"><h2><a id="FilterProvider" name="FilterProvider">FilterProvider</a> <a id="filterprovider" name="filterprovider">Directive</a></h2>
+<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="directive-section"><h2><a name="FilterProvider" id="FilterProvider">FilterProvider</a> <a name="filterprovider" id="filterprovider">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Register a content filter</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>FilterProvider <var>filter-name</var> <var>provider-name</var>
</table>
</div>
-<div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div>
-<div class="directive-section"><h2><a id="FilterTrace" name="FilterTrace">FilterTrace</a> <a id="filtertrace" name="filtertrace">Directive</a></h2>
+<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="directive-section"><h2><a name="FilterTrace" id="FilterTrace">FilterTrace</a> <a name="filtertrace" id="filtertrace">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Get debug/diagnostic information from
mod_filter</td></tr>
<dd><code class="module"><a href="../mod/mod_filter.html">mod_filter</a></code> will record buckets and brigades
passing through the filter to the error log, before the provider has
processed them. This is similar to the information generated by
- <a href="@href">mod_diagnostics</a>.
+ <a href="http://apache.webthing.com/mod_diagnostics/">mod_diagnostics</a>.
</dd>
<dt><code>2</code> (not yet implemented)</dt>
</div><div id="footer">
<p class="apache">Copyright 1999-2004 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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