sockets by default. Additionally, the <code class="directive"><a href="./mod/mpm_common.html#listen">Listen</a></code>, <code class="directive"><a href="./mod/core.html#namevirtualhost">NameVirtualHost</a></code>, and <code class="directive"><a href="./mod/core.html#virtualhost">VirtualHost</a></code> directives support
IPv6 numeric address strings (e.g., "<code>Listen
[2001:db8::1]:8080</code>").</dd>
<dt>Filtering</dt>
<dd>Apache modules may now be written as filters which act on
the stream of content as it is delivered to or from the
server. This allows, for example, the output of CGI scripts to
be parsed for Server Side Include directives using the
<code>INCLUDES</code> filter in <code class="module"><a href="./mod/mod_include.html">mod_include</a></code>. The
module <code class="module"><a href="./mod/mod_ext_filter.html">mod_ext_filter</a></code> allows external programs to
act as filters in much the same way that CGI programs can act as
handlers.</dd>
<dt>Multilanguage Error Responses</dt>
<dd>Error response messages to the browser are now provided in
several languages, using SSI documents. They may be customized
by the administrator to achieve a consistent look and feel.</dd>
<dt>Simplified configuration</dt>
<dd>Many confusing directives have been simplified. The often
confusing <code>Port</code> and <code>BindAddress</code> directives
are gone; only the <code class="directive"><a href="./mod/mpm_common.html#listen">Listen</a></code>
directive is used for IP address binding; the <code class="directive"><a href="./mod/core.html#servername">ServerName</a></code> directive specifies the
server name and port number only for redirection and vhost
recognition.</dd>
<dt>Native Windows NT Unicode Support</dt>
<dd>Apache 2.0 on Windows NT now uses utf-8 for all filename
encodings. These directly translate to the underlying Unicode
file system, providing multilanguage support for all Windows
NT-based installations, including Windows 2000 and Windows XP.
<em>This support does not extend to Windows 95, 98 or ME, which
continue to use the machine's local codepage for filesystem
access.</em></dd>
<dt>Regular Expression Library Updated</dt>
<dd>Apache 2.0 includes the <a href="http://www.pcre.org/">Perl
Compatible Regular Expression Library</a> (PCRE). All regular
expression evaluation now uses the more powerful Perl 5
<dd>A new <code class="directive"><a href="./mod/mod_negotiation.html#forcelanguagepriority">ForceLanguagePriority</a></code> directive can be used to assure that
the client receives a single document in all cases, rather than
NOT ACCEPTABLE or MULTIPLE CHOICES responses. In addition, the
negotiation and MultiViews algorithms have been cleaned up to
provide more consistent results and a new form of type map that
<p class="apache">Copyright 2007 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>
