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-<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
-<HTML>
-<HEAD>
-<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><A HREF="#virtualdocumentrootip">VirtualDocumentRootIP</A>
- <LI><A HREF="#virtualscriptalias">VirtualScriptAlias</A>
- <LI><A HREF="#virtualscriptaliasip">VirtualScriptAliasIP</A>
-</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:
-<DL>
- <DT><CODE>%%</CODE>
- <DD>insert a <CODE>%</CODE>
- <DT><CODE>%p</CODE>
- <DD>insert the port number of the virtual host
- <DT><CODE>%N.M</CODE>
- <DD>insert (part of) the name
-</DL>
-</P>
-
-<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:
-<DL>
- <DT><CODE>0</CODE>
- <DD>the whole name
- <DT><CODE>1</CODE>
- <DD>the first part
- <DT><CODE>2</CODE>
- <DD>the second part
- <DT><CODE>-1</CODE>
- <DD>the last part
- <DT><CODE>-2</CODE>
- <DD>the penultimate part
- <DT><CODE>2+</CODE>
- <DD>the second and all subsequent parts
- <DT><CODE>-2+</CODE>
- <DD>the penultimate and all preceding parts
- <DT><CODE>1+</CODE> and <CODE>-1+</CODE>
- <DD>the same as <CODE>0</CODE>
-</DL>
-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:
-<PRE>
- UseCanonicalName Off
- VirtualDocumentRoot /usr/local/apache/vhosts/%0
-</PRE>
-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:
-<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>
-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:
-<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>
-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:
-<PRE>
- VirtualDocumentRoot /usr/local/apache/vhosts/%2.0.%3.0
-</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/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 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>VirtaulDocumentRoot</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 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 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 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>
-<HR>
-
-<H3 ALIGN="CENTER">
- Apache HTTP Server Version 1.3
-</H3>
-
-<A HREF="./"><IMG SRC="../images/index.gif" ALT="Index"></A>
-<A HREF="../"><IMG SRC="../images/home.gif" ALT="Home"></A>
-
-</BODY>
-</HTML>