some of this functionality for back-compatibility with Apache 2.0
modules. For httpd 2.1 and later, the
<code>ap_register_output_filter_protocol</code> and
<code>ap_filter_protocol</code> API enables filter modules to
declare their own behaviour.</p>
<p>At the same time, <code class="module"><a href="../mod/mod_filter.html">mod_filter</a></code> should not interfere
with a filter that wants to handle all aspects of the protocol. By
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>
<p>At the time of writing, this feature is largely untested,
as modules in common use are designed to work with 2.0.
<p>This directive registers a <em>provider</em> for the smart filter.
The provider will be called if and only if the <var>match</var> declared
here matches the value of the header or environment variable declared
as <var>dispatch</var>.</p>
<p>
<var>provider-name</var> must have been registered by loading
a module that registers the name with
<code>ap_register_output_filter</code>.
</p>
<p>The <var>dispatch</var> argument is a string with optional
<code>req=</code>, <code>resp=</code> or <code>env=</code> prefix
causing it to dispatch on (respectively) the request header, response
header, or environment variable named. In the absence of a
prefix, it defaults to a response header. A special case is the
word <code>handler</code>, which causes <code class="module"><a href="../mod/mod_filter.html">mod_filter</a></code>
to dispatch on the content handler.</p>
<p>The <var>match</var> argument specifies a match that will be applied to
the filter's <var>dispatch</var> criterion. The <var>match</var> may be
a string match (exact match or substring), a <a class="glossarylink" href="../glossary.html#regex" title="see glossary">regex</a>, an integer (greater, lessthan or equals), or
unconditional. The first characters of the <var>match</var> argument
determines this:</p>
<p><strong>First</strong>, if the first character is an exclamation mark
(<code>!</code>), this reverses the rule, so the provider will be used
if and only if the match <em>fails</em>.</p>
<p><strong>Second</strong>, it interprets the first character excluding
<dd>Will dump the full data passing through to a tempfile before the
provider. <strong>For single-user debug only</strong>; this will not
support concurrent hits.</dd>
</dl>
</div>
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