APACHE_1_3_42/htdocs/manual/mod/mod_vhost_alias.html - httpd - Git at Google

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     <h1 align="CENTER">Module mod_vhost_alias</h1>

     <p>This module provides support for <a
     href="../vhosts/mass.html">dynamically configured mass virtual
     hosting</a>.</p>

     <p><a href="module-dict.html#Status"
     rel="Help"><strong>Status:</strong></a> Extension<br />
      <a href="module-dict.html#SourceFile"
     rel="Help"><strong>Source File:</strong></a>
     mod_vhost_alias.c<br />
      <a href="module-dict.html#ModuleIdentifier"
     rel="Help"><strong>Module Identifier:</strong></a>
     vhost_alias_module<br />
      <a href="module-dict.html#Compatibility"
     rel="Help"><strong>Compatibility:</strong></a> Available in
     Apache 1.3.7 and later.</p>

     <h2>Summary</h2>

     <p>This module creates dynamically configured virtual hosts, by
     allowing the IP address and/or the <code>Host:</code> header of
     the HTTP request to be used as part of the pathname to
     determine what files to serve. This allows for easy use of a
     huge number of virtual hosts with similar configurations.</p>

     <h2>Directives</h2>

     <ul>
       <li><a
       href="#virtualdocumentroot">VirtualDocumentRoot</a></li>

       <li><a
       href="#virtualdocumentrootip">VirtualDocumentRootIP</a></li>

       <li><a href="#virtualscriptalias">VirtualScriptAlias</a></li>

       <li><a
       href="#virtualscriptaliasip">VirtualScriptAliasIP</a></li>
     </ul>

     <p>See also: <a
     href="core.html#usecanonicalname">UseCanonicalName</a>.</p>

     <h2>Directory Name Interpolation</h2>

     <p>All the directives in this module interpolate a string into
     a pathname. The interpolated string (henceforth called the
     "name") may be either the server name (see the <a
     href="core.html#usecanonicalname"><code>UseCanonicalName</code></a>
     directive for details on how this is determined) or the IP
     address of the virtual host on the server in dotted-quad
     format. The interpolation is controlled by specifiers inspired
     by <code>printf</code> which have a number of formats:</p>

     <dl>
       <dt><code>%%</code></dt>

       <dd>insert a <code>%</code></dd>

       <dt><code>%p</code></dt>

       <dd>insert the port number of the virtual host</dd>

       <dt><code>%N.M</code></dt>

       <dd>insert (part of) the name</dd>
     </dl>

     <p><code>N</code> and <code>M</code> are used to specify
     substrings of the name. <code>N</code> selects from the
     dot-separated components of the name, and <code>M</code>
     selects characters within whatever <code>N</code> has selected.
     <code>M</code> is optional and defaults to zero if it isn't
     present; the dot must be present if and only if <code>M</code>
     is present. The interpretation is as follows:</p>

     <dl>
       <dt><code>0</code></dt>

       <dd>the whole name</dd>

       <dt><code>1</code></dt>

       <dd>the first part</dd>

       <dt><code>2</code></dt>

       <dd>the second part</dd>

       <dt><code>-1</code></dt>

       <dd>the last part</dd>

       <dt><code>-2</code></dt>

       <dd>the penultimate part</dd>

       <dt><code>2+</code></dt>

       <dd>the second and all subsequent parts</dd>

       <dt><code>-2+</code></dt>

       <dd>the penultimate and all preceding parts</dd>

       <dt><code>1+</code> and <code>-1+</code></dt>

       <dd>the same as <code>0</code></dd>
     </dl>

     <p>If <code>N</code> or <code>M</code> is greater than the
     number of parts available a single underscore is
     interpolated.</p>

     <h3>Examples</h3>

     <p>For simple name-based virtual hosts you might use the
     following directives in your server configuration file:</p>
 <pre>
     UseCanonicalName    Off
     VirtualDocumentRoot /usr/local/apache/vhosts/%0
 </pre>

     <p>A request for
     <code>http://www.example.com/directory/file.html</code> will be
     satisfied by the file
     <code>/usr/local/apache/vhosts/www.example.com/directory/file.html</code>.</p>

     <p>For a very large number of virtual hosts it is a good idea
     to arrange the files to reduce the size of the
     <code>vhosts</code> directory. To do this you might use the
     following in your configuration file:</p>
 <pre>
     UseCanonicalName    Off
     VirtualDocumentRoot /usr/local/apache/vhosts/%3+/%2.1/%2.2/%2.3/%2
 </pre>
     A request for
     <code>http://www.example.isp.com/directory/file.html</code>
     will be satisfied by the file
     <code>/usr/local/apache/vhosts/isp.com/e/x/a/example/directory/file.html</code>.
     A more even spread of files can be achieved by hashing from the
     end of the name, for example:
 <pre>
     VirtualDocumentRoot /usr/local/apache/vhosts/%3+/%2.-1/%2.-2/%2.-3/%2
 </pre>
     The example request would come from
     <code>/usr/local/apache/vhosts/isp.com/e/l/p/example/directory/file.html</code>.
     Alternatively you might use:
 <pre>
     VirtualDocumentRoot /usr/local/apache/vhosts/%3+/%2.1/%2.2/%2.3/%2.4+
 </pre>

     <p>The example request would come from
     <code>/usr/local/apache/vhosts/isp.com/e/x/a/mple/directory/file.html</code>.</p>

     <p>For IP-based virtual hosting you might use the following in
     your configuration file:</p>
 <pre>
     UseCanonicalName DNS
     VirtualDocumentRootIP   /usr/local/apache/vhosts/%1/%2/%3/%4/docs
     VirtualScriptAliasIP    /usr/local/apache/vhosts/%1/%2/%3/%4/cgi-bin
 </pre>

     <p>A request for
     <code>http://www.example.isp.com/directory/file.html</code>
     would be satisfied by the file
     <code>/usr/local/apache/vhosts/10/20/30/40/docs/directory/file.html</code>
     if the IP address of <code>www.example.com</code> were
     10.20.30.40. A request for
     <code>http://www.example.isp.com/cgi-bin/script.pl</code> would
     be satisfied by executing the program
     <code>/usr/local/apache/vhosts/10/20/30/40/cgi-bin/script.pl</code>.</p>

     <p>If you want to include the <code>.</code> character in a
     <code>VirtualDocumentRoot</code> directive, but it clashes with
     a <code>%</code> directive, you can work around the problem in
     the following way:</p>
 <pre>
     VirtualDocumentRoot /usr/local/apache/vhosts/%2.0.%3.0
 </pre>

     <p>A request for
     <code>http://www.example.isp.com/directory/file.html</code>
     will be satisfied by the file
     <code>/usr/local/apache/vhosts/example.isp/directory/file.html</code>.</p>

     <p>The <a href="mod_log_config.html#formats">LogFormat
     directives</a> <code>%V</code> and <code>%A</code> are useful
     in conjunction with this module.</p>
     <hr />

     <h2><a id="virtualdocumentroot"
     name="virtualdocumentroot">VirtualDocumentRoot
     directive</a></h2>

     <p><a href="directive-dict.html#Syntax"
     rel="Help"><strong>Syntax:</strong></a> VirtualDocumentRoot
     <em>interpolated-directory</em><br />
      <a href="directive-dict.html#Default"
     rel="Help"><strong>Default:</strong></a> None<br />
      <a href="directive-dict.html#Context"
     rel="Help"><strong>Context:</strong></a> server config, virtual
     host<br />
      <a href="directive-dict.html#Status"
     rel="Help"><strong>Status:</strong></a> Extension<br />
      <a href="directive-dict.html#Module"
     rel="Help"><strong>Module:</strong></a> mod_vhost_alias<br />
      <a href="directive-dict.html#Compatibility"
     rel="Help"><strong>Compatibility:</strong></a>
     VirtualDocumentRoot is only available in 1.3.7 and later.</p>

     <p>The <code>VirtualDocumentRoot</code> directive allows you to
     determine where Apache will find your documents based on the
     value of the server name. The result of expanding
     <em>interpolated-directory</em> is used as the root of the
     document tree in a similar manner to the <a
     href="core.html#documentroot"><code>DocumentRoot</code></a>
     directive's argument. If <em>interpolated-directory</em> is
     <code>none</code> then <code>VirtualDocumentRoot</code> is
     turned off. This directive cannot be used in the same context
     as <a
     href="#virtualdocumentrootip"><code>VirtualDocumentRootIP</code></a>.</p>
     <hr />

     <h2><a id="virtualdocumentrootip"
     name="virtualdocumentrootip">VirtualDocumentRootIP
     directive</a></h2>

     <p><a href="directive-dict.html#Syntax"
     rel="Help"><strong>Syntax:</strong></a> VirtualDocumentRootIP
     <em>interpolated-directory</em><br />
      <a href="directive-dict.html#Default"
     rel="Help"><strong>Default:</strong></a> None<br />
      <a href="directive-dict.html#Context"
     rel="Help"><strong>Context:</strong></a> server config, virtual
     host<br />
      <a href="directive-dict.html#Status"
     rel="Help"><strong>Status:</strong></a> Extension<br />
      <a href="directive-dict.html#Module"
     rel="Help"><strong>Module:</strong></a> mod_vhost_alias<br />
      <a href="directive-dict.html#Compatibility"
     rel="Help"><strong>Compatibility:</strong></a>
     VirtualDocumentRootIP is only available in 1.3.7 and later.</p>

     <p>The <code>VirtualDocumentRootIP</code> directive is like the
     <a
     href="#virtualdocumentroot"><code>VirtualDocumentRoot</code></a>
     directive, except that it uses the IP address of the server end
     of the connection instead of the server name.</p>
     <hr />

     <h2><a id="virtualscriptalias"
     name="virtualscriptalias">VirtualScriptAlias directive</a></h2>

     <p><a href="directive-dict.html#Syntax"
     rel="Help"><strong>Syntax:</strong></a> VirtualScriptAlias
     <em>interpolated-directory</em><br />
      <a href="directive-dict.html#Default"
     rel="Help"><strong>Default:</strong></a> None<br />
      <a href="directive-dict.html#Context"
     rel="Help"><strong>Context:</strong></a> server config, virtual
     host<br />
      <a href="directive-dict.html#Status"
     rel="Help"><strong>Status:</strong></a> Extension<br />
      <a href="directive-dict.html#Module"
     rel="Help"><strong>Module:</strong></a> mod_vhost_alias<br />
      <a href="directive-dict.html#Compatibility"
     rel="Help"><strong>Compatibility:</strong></a>
     VirtualScriptAlias is only available in 1.3.7 and later.</p>

     <p>The <code>VirtualScriptAlias</code> directive allows you to
     determine where Apache will find CGI scripts in a similar
     manner to <a
     href="#virtualdocumentroot"><code>VirtualDocumentRoot</code></a>
     does for other documents. It matches requests for URIs starting
     <code>/cgi-bin/</code>, much like <code><a
     href="mod_alias.html#scriptalias">ScriptAlias</a>
     /cgi-bin/</code> would.</p>
     <hr />

     <h2><a id="virtualscriptaliasip"
     name="virtualscriptaliasip">VirtualScriptAliasIP
     directive</a></h2>

     <p><a href="directive-dict.html#Syntax"
     rel="Help"><strong>Syntax:</strong></a> VirtualScriptAliasIP
     <em>interpolated-directory</em><br />
      <a href="directive-dict.html#Default"
     rel="Help"><strong>Default:</strong></a> None<br />
      <a href="directive-dict.html#Context"
     rel="Help"><strong>Context:</strong></a> server config, virtual
     host<br />
      <a href="directive-dict.html#Status"
     rel="Help"><strong>Status:</strong></a> Extension<br />
      <a href="directive-dict.html#Module"
     rel="Help"><strong>Module:</strong></a> mod_vhost_alias<br />
      <a href="directive-dict.html#Compatibility"
     rel="Help"><strong>Compatibility:</strong></a>
     VirtualScriptAliasIP is only available in 1.3.7 and later.</p>

     <p>The <code>VirtualScriptAliasIP</code> directive is like the
     <a
     href="#virtualscriptalias"><code>VirtualScriptAlias</code></a>
     directive, except that it uses the IP address of the server end
     of the connection instead of the server name.</p>
     <!--#include virtual="footer.html" -->
   </body>
 </html>
	<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
	"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

	<html xmlns="http://www.w3.org/1999/xhtml">
	<head>
	<meta name="generator" content="HTML Tidy, see www.w3.org" />

	<title>Apache module mod_vhost_alias</title>
	</head>
	<!-- Background white, links blue (unvisited), navy (visited), red (active) -->

	<body bgcolor="#FFFFFF" text="#000000" link="#0000FF"
	vlink="#000080" alink="#FF0000">
	<!--#include virtual="header.html" -->

	<h1 align="CENTER">Module mod_vhost_alias</h1>

	<p>This module provides support for <a
	href="../vhosts/mass.html">dynamically configured mass virtual
	hosting</a>.</p>

	<p><a href="module-dict.html#Status"
	rel="Help"><strong>Status:</strong></a> Extension<br />
	<a href="module-dict.html#SourceFile"
	rel="Help"><strong>Source File:</strong></a>
	mod_vhost_alias.c<br />
	<a href="module-dict.html#ModuleIdentifier"
	rel="Help"><strong>Module Identifier:</strong></a>
	vhost_alias_module<br />
	<a href="module-dict.html#Compatibility"
	rel="Help"><strong>Compatibility:</strong></a> Available in
	Apache 1.3.7 and later.</p>

	<h2>Summary</h2>

	<p>This module creates dynamically configured virtual hosts, by
	allowing the IP address and/or the <code>Host:</code> header of
	the HTTP request to be used as part of the pathname to
	determine what files to serve. This allows for easy use of a
	huge number of virtual hosts with similar configurations.</p>

	<h2>Directives</h2>

	<ul>
	<li><a
	href="#virtualdocumentroot">VirtualDocumentRoot</a></li>

	<li><a
	href="#virtualdocumentrootip">VirtualDocumentRootIP</a></li>

	<li><a href="#virtualscriptalias">VirtualScriptAlias</a></li>

	<li><a
	href="#virtualscriptaliasip">VirtualScriptAliasIP</a></li>
	</ul>

	<p>See also: <a
	href="core.html#usecanonicalname">UseCanonicalName</a>.</p>

	<h2>Directory Name Interpolation</h2>

	<p>All the directives in this module interpolate a string into
	a pathname. The interpolated string (henceforth called the
	"name") may be either the server name (see the <a
	href="core.html#usecanonicalname"><code>UseCanonicalName</code></a>
	directive for details on how this is determined) or the IP
	address of the virtual host on the server in dotted-quad
	format. The interpolation is controlled by specifiers inspired
	by <code>printf</code> which have a number of formats:</p>

	<dl>
	<dt><code>%%</code></dt>

	<dd>insert a <code>%</code></dd>

	<dt><code>%p</code></dt>

	<dd>insert the port number of the virtual host</dd>

	<dt><code>%N.M</code></dt>

	<dd>insert (part of) the name</dd>
	</dl>

	<p><code>N</code> and <code>M</code> are used to specify
	substrings of the name. <code>N</code> selects from the
	dot-separated components of the name, and <code>M</code>
	selects characters within whatever <code>N</code> has selected.
	<code>M</code> is optional and defaults to zero if it isn't
	present; the dot must be present if and only if <code>M</code>
	is present. The interpretation is as follows:</p>

	<dl>
	<dt><code>0</code></dt>

	<dd>the whole name</dd>

	<dt><code>1</code></dt>

	<dd>the first part</dd>

	<dt><code>2</code></dt>

	<dd>the second part</dd>

	<dt><code>-1</code></dt>

	<dd>the last part</dd>

	<dt><code>-2</code></dt>

	<dd>the penultimate part</dd>

	<dt><code>2+</code></dt>

	<dd>the second and all subsequent parts</dd>

	<dt><code>-2+</code></dt>

	<dd>the penultimate and all preceding parts</dd>

	<dt><code>1+</code> and <code>-1+</code></dt>

	<dd>the same as <code>0</code></dd>
	</dl>

	<p>If <code>N</code> or <code>M</code> is greater than the
	number of parts available a single underscore is
	interpolated.</p>

	<h3>Examples</h3>

	<p>For simple name-based virtual hosts you might use the
	following directives in your server configuration file:</p>
	<pre>
	UseCanonicalName Off
	VirtualDocumentRoot /usr/local/apache/vhosts/%0
	</pre>

	<p>A request for
	<code>http://www.example.com/directory/file.html</code> will be
	satisfied by the file
	<code>/usr/local/apache/vhosts/www.example.com/directory/file.html</code>.</p>

	<p>For a very large number of virtual hosts it is a good idea
	to arrange the files to reduce the size of the
	<code>vhosts</code> directory. To do this you might use the
	following in your configuration file:</p>
	<pre>
	UseCanonicalName Off
	VirtualDocumentRoot /usr/local/apache/vhosts/%3+/%2.1/%2.2/%2.3/%2
	</pre>
	A request for
	<code>http://www.example.isp.com/directory/file.html</code>
	will be satisfied by the file
	<code>/usr/local/apache/vhosts/isp.com/e/x/a/example/directory/file.html</code>.
	A more even spread of files can be achieved by hashing from the
	end of the name, for example:
	<pre>
	VirtualDocumentRoot /usr/local/apache/vhosts/%3+/%2.-1/%2.-2/%2.-3/%2
	</pre>
	The example request would come from
	<code>/usr/local/apache/vhosts/isp.com/e/l/p/example/directory/file.html</code>.
	Alternatively you might use:
	<pre>
	VirtualDocumentRoot /usr/local/apache/vhosts/%3+/%2.1/%2.2/%2.3/%2.4+
	</pre>

	<p>The example request would come from
	<code>/usr/local/apache/vhosts/isp.com/e/x/a/mple/directory/file.html</code>.</p>

	<p>For IP-based virtual hosting you might use the following in
	your configuration file:</p>
	<pre>
	UseCanonicalName DNS
	VirtualDocumentRootIP /usr/local/apache/vhosts/%1/%2/%3/%4/docs
	VirtualScriptAliasIP /usr/local/apache/vhosts/%1/%2/%3/%4/cgi-bin
	</pre>

	<p>A request for
	<code>http://www.example.isp.com/directory/file.html</code>
	would be satisfied by the file
	<code>/usr/local/apache/vhosts/10/20/30/40/docs/directory/file.html</code>
	if the IP address of <code>www.example.com</code> were
	10.20.30.40. A request for
	<code>http://www.example.isp.com/cgi-bin/script.pl</code> would
	be satisfied by executing the program
	<code>/usr/local/apache/vhosts/10/20/30/40/cgi-bin/script.pl</code>.</p>

	<p>If you want to include the <code>.</code> character in a
	<code>VirtualDocumentRoot</code> directive, but it clashes with
	a <code>%</code> directive, you can work around the problem in
	the following way:</p>
	<pre>
	VirtualDocumentRoot /usr/local/apache/vhosts/%2.0.%3.0
	</pre>

	<p>A request for
	<code>http://www.example.isp.com/directory/file.html</code>
	will be satisfied by the file
	<code>/usr/local/apache/vhosts/example.isp/directory/file.html</code>.</p>

	<p>The <a href="mod_log_config.html#formats">LogFormat
	directives</a> <code>%V</code> and <code>%A</code> are useful
	in conjunction with this module.</p>
	<hr />

	<h2><a id="virtualdocumentroot"
	name="virtualdocumentroot">VirtualDocumentRoot
	directive</a></h2>

	<p><a href="directive-dict.html#Syntax"
	rel="Help"><strong>Syntax:</strong></a> VirtualDocumentRoot
	<em>interpolated-directory</em><br />
	<a href="directive-dict.html#Default"
	rel="Help"><strong>Default:</strong></a> None<br />
	<a href="directive-dict.html#Context"
	rel="Help"><strong>Context:</strong></a> server config, virtual
	host<br />
	<a href="directive-dict.html#Status"
	rel="Help"><strong>Status:</strong></a> Extension<br />
	<a href="directive-dict.html#Module"
	rel="Help"><strong>Module:</strong></a> mod_vhost_alias<br />
	<a href="directive-dict.html#Compatibility"
	rel="Help"><strong>Compatibility:</strong></a>
	VirtualDocumentRoot is only available in 1.3.7 and later.</p>

	<p>The <code>VirtualDocumentRoot</code> directive allows you to
	determine where Apache will find your documents based on the
	value of the server name. The result of expanding
	<em>interpolated-directory</em> is used as the root of the
	document tree in a similar manner to the <a
	href="core.html#documentroot"><code>DocumentRoot</code></a>
	directive's argument. If <em>interpolated-directory</em> is
	<code>none</code> then <code>VirtualDocumentRoot</code> is
	turned off. This directive cannot be used in the same context
	as <a
	href="#virtualdocumentrootip"><code>VirtualDocumentRootIP</code></a>.</p>
	<hr />

	<h2><a id="virtualdocumentrootip"
	name="virtualdocumentrootip">VirtualDocumentRootIP
	directive</a></h2>

	<p><a href="directive-dict.html#Syntax"
	rel="Help"><strong>Syntax:</strong></a> VirtualDocumentRootIP
	<em>interpolated-directory</em><br />
	<a href="directive-dict.html#Default"
	rel="Help"><strong>Default:</strong></a> None<br />
	<a href="directive-dict.html#Context"
	rel="Help"><strong>Context:</strong></a> server config, virtual
	host<br />
	<a href="directive-dict.html#Status"
	rel="Help"><strong>Status:</strong></a> Extension<br />
	<a href="directive-dict.html#Module"
	rel="Help"><strong>Module:</strong></a> mod_vhost_alias<br />
	<a href="directive-dict.html#Compatibility"
	rel="Help"><strong>Compatibility:</strong></a>
	VirtualDocumentRootIP is only available in 1.3.7 and later.</p>

	<p>The <code>VirtualDocumentRootIP</code> directive is like the
	<a
	href="#virtualdocumentroot"><code>VirtualDocumentRoot</code></a>
	directive, except that it uses the IP address of the server end
	of the connection instead of the server name.</p>
	<hr />

	<h2><a id="virtualscriptalias"
	name="virtualscriptalias">VirtualScriptAlias directive</a></h2>

	<p><a href="directive-dict.html#Syntax"
	rel="Help"><strong>Syntax:</strong></a> VirtualScriptAlias
	<em>interpolated-directory</em><br />
	<a href="directive-dict.html#Default"
	rel="Help"><strong>Default:</strong></a> None<br />
	<a href="directive-dict.html#Context"
	rel="Help"><strong>Context:</strong></a> server config, virtual
	host<br />
	<a href="directive-dict.html#Status"
	rel="Help"><strong>Status:</strong></a> Extension<br />
	<a href="directive-dict.html#Module"
	rel="Help"><strong>Module:</strong></a> mod_vhost_alias<br />
	<a href="directive-dict.html#Compatibility"
	rel="Help"><strong>Compatibility:</strong></a>
	VirtualScriptAlias is only available in 1.3.7 and later.</p>

	<p>The <code>VirtualScriptAlias</code> directive allows you to
	determine where Apache will find CGI scripts in a similar
	manner to <a
	href="#virtualdocumentroot"><code>VirtualDocumentRoot</code></a>
	does for other documents. It matches requests for URIs starting
	<code>/cgi-bin/</code>, much like <code><a
	href="mod_alias.html#scriptalias">ScriptAlias</a>
	/cgi-bin/</code> would.</p>
	<hr />

	<h2><a id="virtualscriptaliasip"
	name="virtualscriptaliasip">VirtualScriptAliasIP
	directive</a></h2>

	<p><a href="directive-dict.html#Syntax"
	rel="Help"><strong>Syntax:</strong></a> VirtualScriptAliasIP
	<em>interpolated-directory</em><br />
	<a href="directive-dict.html#Default"
	rel="Help"><strong>Default:</strong></a> None<br />
	<a href="directive-dict.html#Context"
	rel="Help"><strong>Context:</strong></a> server config, virtual
	host<br />
	<a href="directive-dict.html#Status"
	rel="Help"><strong>Status:</strong></a> Extension<br />
	<a href="directive-dict.html#Module"
	rel="Help"><strong>Module:</strong></a> mod_vhost_alias<br />
	<a href="directive-dict.html#Compatibility"
	rel="Help"><strong>Compatibility:</strong></a>
	VirtualScriptAliasIP is only available in 1.3.7 and later.</p>

	<p>The <code>VirtualScriptAliasIP</code> directive is like the
	<a
	href="#virtualscriptalias"><code>VirtualScriptAlias</code></a>
	directive, except that it uses the IP address of the server end
	of the connection instead of the server name.</p>
	<!--#include virtual="footer.html" -->
	</body>
	</html>