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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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<TITLE>Apache module mod_alias</TITLE>
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<H1 ALIGN="CENTER">Module mod_alias</h1>
<P>
This module is contained in the <code>mod_alias.c</code> file, and
is compiled in by default. It provides for mapping different parts of the
host filesystem in the the document tree, and for URL redirection.
</P>
<H2>Directives</H2>
<UL>
<li><A HREF="#alias">Alias</A>
<li><A HREF="#redirect">Redirect</A>
<li><A HREF="#redirecttemp">RedirectTemp</A>
<li><A HREF="#redirectperm">RedirectPermanent</A>
<li><A HREF="#scriptalias">ScriptAlias</A>
</UL>
<hr>
<h2><A name="alias">Alias directive</A></h2>
<P>
<!--%plaintext <?INDEX {\tt Alias} directive> -->
<strong>Syntax:</strong> Alias <em>url-path directory-filename</em><br>
<Strong>Context:</strong> server config, virtual host<br>
<strong>Status:</strong> Base<br>
<strong>Module:</strong> mod_alias
</P>
<P>
The Alias directive allows documents to be stored in the local filesystem
other than under the <A HREF="core.html#documentroot">DocumentRoot</A>.
URLs with a (%-decoded) path beginning with <em>url-path</em> will be
mapped to local files beginning with <em>directory-filename</em>.
<P>
Example:
</P>
<blockquote><code>Alias /image /ftp/pub/image</code></blockquote>
<P>
A request for http://myserver/image/foo.gif would cause the server to
return the file /ftp/pub/image/foo.gif.
</p>
<P>
Note that if you include a trailing / on the <em>url-path</em> then the
server will require a trailing / in order to expand the alias. That is,
if you use <code>Alias /icons/ /usr/local/etc/httpd/icons/</code> then
the url <code>/icons</code> will not be aliased.
</p>
<P>
See also <A HREF="#scriptalias">ScriptAlias</A>.
</p>
<hr>
<h2><A name="redirect">Redirect directive</A></h2>
<P>
<!--%plaintext <?INDEX {\tt Redirect} directive> -->
<strong>Syntax:</strong> Redirect [ <em>status</em> ] <em>url-path url</em><br>
<Strong>Context:</strong> server config, virtual host, directory, .htaccess<br>
<strong>Status:</strong> Base<br>
<strong>Module:</strong> mod_alias<br>
<strong>Compatibility:</strong> The directory and .htaccess context's
are only available in versions 1.1 and later. The <em>status</em>
argument is only available in Apache 1.2 or later.
</P>
<P>
The Redirect directive maps an old URL into a new one. The new URL is returned
to the client which attempts to fetch it again with the new address.
<em>Url-path</em> a (%-decoded) path; any requests for documents beginning with
this path will be returned a redirect error to a new (%-encoded) url
beginning with <em>url</em>.
</P>
<P>
Example:
</P>
<blockquote><code>Redirect /service
http://foo2.bar.com/service</code></blockquote>
<P>
If the client requests http://myserver/service/foo.txt, it will be told to
access http://foo2.bar.com/service/foo.txt instead.
</p>
<P>
<STRONG>Note:</STRONG> Redirect directives take precedence over Alias
and ScriptAlias
directives, irrespective of their ordering in the configuration file. Also,
<em>Url-path</em> must be an absolute path, not a relative path, even
when used with .htaccess files or inside of <Directory> sections.
</p>
<P>
If no <em>status</em> argument is given, the redirect will be
"temporary" (HTTP status 302). This indicates to the client that the
resources is has moved temporarily. The <em>status</em>
argument can be used to return other HTTP status codes:
<P>
<dl>
<dt>permanent
<dd>Returns a permanent redirect status (301) indicating that
the resource has moved permanently.
<dt>temp
<dd>Returns a temporary redirect status (302). This is the
default.
<dt>seeother
<dd>Returns a "See Other" status (303) indicating that
the resource has been replaced.
<dt>gone
<dd>Returns a "Gone" status (410) indicating that the resource
has been permanently removed. When this status is used the <em>url</em>
argument should be omitted.
</dl>
<P>
Other status codes can be returned by giving the numeric status code
as the value of <em>status</em>. If the status is between 300 and 399,
the <em>url</em> argument must be present, otherwise it must be
omitted. Note that the status must be known to the Apache code (see
the function <code>send_error_response</code> in http_protocol.c).
</P>
<HR>
<h2><A name="redirecttemp">RedirectTemp directive</A></h2>
<P>
<!--%plaintext <?INDEX {\tt Redirect} directive> -->
<strong>Syntax:</strong> RedirectTemp <em>url-path url</em><br>
<Strong>Context:</strong> server config, virtual host, directory, .htaccess<br>
<strong>Status:</strong> Base<br>
<strong>Module:</strong> mod_alias<br>
<strong>Compatibility:</strong> This directive is only available in 1.2
</P>
<P>
This directive makes the client know that the Redirect is only
temporary (status 302). Exactly equivalent to <code>Redirect
temporary</code>.
</P>
<HR>
<h2><A name="redirectperm">RedirectPermanent directive</A></h2>
<P>
<!--%plaintext <?INDEX {\tt Redirect} directive> -->
<strong>Syntax:</strong> RedirectPermanent <em>url-path url</em><br>
<Strong>Context:</strong> server config, virtual host, directory, .htaccess<br>
<strong>Status:</strong> Base<br>
<strong>Module:</strong> mod_alias<br>
<strong>Compatibility:</strong> This directive is only available in 1.2
</P>
<P>
This directive makes the client know that the Redirect is permanent
(status 301). Exactly equivalent to <code>Redirect permanent</code>.
</P>
<hr>
<h2><A name="scriptalias">ScriptAlias directive</A></h2>
<P>
<!--%plaintext <?INDEX {\tt ScriptAlias} directive> -->
<strong>Syntax:</strong> ScriptAlias <em>url-path directory-filename</em><br>
<Strong>Context:</strong> server config, virtual host<br>
<strong>Status:</strong> Base<br>
<strong>Module:</strong> mod_alias
</P>
<P>
The ScriptAlias directive has the same behavior as the
<A HREF="#alias">Alias</A> directive, except that in addition it
marks the target directory as containing CGI scripts.
URLs with a (%-decoded) path beginning with <em>url-path</em> will be
mapped to scripts beginning with <em>directory-filename</em>.
<P>
Example:
</P>
<blockquote><code>ScriptAlias /cgi-bin/ /web/cgi-bin/</code></blockquote>
<P>
A request for http://myserver/cgi-bin/foo would cause the server to
run the script /web/cgi-bin/foo.
</P>
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