Add information on backwards-compatible handler and magic-mime-types

Options +Includes

</code></blockquote>

<p>For backwards compatibility, the <code>server-parsed</code> <a

href="../handler.html">handler</a> also activates the INCLUDES filter.

As well, Apache will activate the INCLUDES filter for any document

with mime type <code>text/x-server-parsed-html</code> or

<code>text/x-server-parsed-html3</code> (and the resulting output will

have the mime type <code>text/html</code>).</p>

<p>For more information, see our <a href="../howto/ssi.html">Tutorial

on Server Side Includes</a>.</p>

MPM.  Other MPMs will have different directives to control process

creation and request processing.</li>

<li>Server-Side Includes provided by <a

href="mod/mod_include.html">mod_include</a> are now implemented using

the new

<a href="filter.html">filter system</a> rather than as a handler.

This provides much more power and flexibility, but requires 

the use of the <a href="mod/core.html#setoutputfilter">SetOutputFilter</a>

to activate server-parsed content.  If you were using

<code>AddHandler server-parsed .shtml</code>, you can get

similar functionality using

<blockquote><code>

&lt;FilesMatch "\.shtml(\..+)?$"&gt;<br>

&nbsp;&nbsp;SetOutputFilter INCLUDES<br>

</FilesMatch>

</code></blockquote></li>

<li>The <code>CacheNegotiatedDocs</code> directive now takes

the argument <code>on</code> or <code>off</code>.  Existing

instances of <code>CacheNegotiatedDocs</code> should be replaced