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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//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 provides for mapping different parts of the host
filesystem in the document tree, and for URL redirection.</p>
<p><a href="module-dict.html#Status"
rel="Help"><strong>Status:</strong></a> Base<br />
<a href="module-dict.html#SourceFile"
rel="Help"><strong>Source File:</strong></a> mod_alias.c<br />
<a href="module-dict.html#ModuleIdentifier"
rel="Help"><strong>Module Identifier:</strong></a>
alias_module</p>
<h2>Summary</h2>
<p>The directives contained in this module allow for
manipulation and control of URLs as requests arrive at the
server. The <code>Alias</code> and <code>ScriptAlias</code>
directives are used to map between URLs and filesystem paths.
This allows for content which is not directly under the <a
href="core.html#documentroot"><code>DocumentRoot</code></a> to
be served as part of the web document tree. The
<code>ScriptAlias</code> directive has the additional effect of
marking the target directory as containing only CGI
scripts.</p>
<p>The <code>Redirect</code> directives are used to instruct
clients to make a new request with a different URL. They are
often used when a resource has moved to a new location.</p>
<p>A more powerful and flexible set of directives for
manipulating URLs is contained in the <a
href="mod_rewrite.html"><code>mod_rewrite</code></a>
module.</p>
<h2>Directives</h2>
<ul>
<li><a href="#alias">Alias</a></li>
<li><a href="#aliasmatch">AliasMatch</a></li>
<li><a href="#redirect">Redirect</a></li>
<li><a href="#redirectmatch">RedirectMatch</a></li>
<li><a href="#redirecttemp">RedirectTemp</a></li>
<li><a href="#redirectperm">RedirectPermanent</a></li>
<li><a href="#scriptalias">ScriptAlias</a></li>
<li><a href="#scriptaliasmatch">ScriptAliasMatch</a></li>
</ul>
<hr />
<h2><a id="alias" name="alias">Alias directive</a></h2>
<p>
<a href="directive-dict.html#Syntax"
rel="Help"><strong>Syntax:</strong></a> Alias <em>URL-path
file-path</em>|<em>directory-path</em><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> Base<br />
<a href="directive-dict.html#Module"
rel="Help"><strong>Module:</strong></a> 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>
<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/apache/icons/</code> then the url
<code>/icons</code> will not be aliased.</p>
<p>Note that you may need to specify additional <a
href="core.html#directory"><code><Directory></code></a>
sections which cover the <em>destination</em> of aliases.
Aliasing occurs before <code><Directory></code> sections
are checked, so only the destination of aliases are affected.
(Note however <a
href="core.html#location"><code><Location></code></a>
sections are run through once before aliases are performed, so
they will apply.)</p>
<p>See also <a href="#scriptalias">ScriptAlias</a>.</p>
<hr />
<h2><a id="aliasmatch" name="aliasmatch">AliasMatch</a></h2>
<p><a href="directive-dict.html#Syntax"
rel="Help"><strong>Syntax:</strong></a> AliasMatch <em>regex
file-path</em>|<em>directory-path</em><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> Base<br />
<a href="directive-dict.html#Module"
rel="Help"><strong>Module:</strong></a> mod_alias<br />
<a href="directive-dict.html#Compatibility"
rel="Help"><strong>Compatibility:</strong></a> Available in
Apache 1.3 and later</p>
<p>This directive is equivalent to <a href="#alias">Alias</a>,
but makes use of standard regular expressions, instead of
simple prefix matching. The supplied regular expression is
matched against the URL-path, and if it matches, the server
will substitute any parenthesized matches into the given string
and use it as a filename. For example, to activate the
<code>/icons</code> directory, one might use:</p>
<pre>
AliasMatch ^/icons(.*) /usr/local/apache/icons$1
</pre>
<hr />
<h2><a id="redirect" name="redirect">Redirect
directive</a></h2>
<p>
<a href="directive-dict.html#Syntax"
rel="Help"><strong>Syntax:</strong></a> Redirect
[<em>status</em>] <em>URL-path URL</em><br />
<a href="directive-dict.html#Context"
rel="Help"><strong>Context:</strong></a> server config, virtual
host, directory, .htaccess<br />
<a href="directive-dict.html#Override"
rel="Help"><strong>Override:</strong></a> FileInfo<br />
<a href="directive-dict.html#Status"
rel="Help"><strong>Status:</strong></a> Base<br />
<a href="directive-dict.html#Module"
rel="Help"><strong>Module:</strong></a> mod_alias<br />
<a href="directive-dict.html#Compatibility"
rel="Help"><strong>Compatibility:</strong></a> 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 a fully qualified URL, 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 resource has moved temporarily. The <em>status</em>
argument can be used to return other HTTP status codes:</p>
<dl>
<dt>permanent</dt>
<dd>Returns a permanent redirect status (301) indicating that
the resource has moved permanently.</dd>
<dt>temp</dt>
<dd>Returns a temporary redirect status (302). This is the
default.</dd>
<dt>seeother</dt>
<dd>Returns a "See Other" status (303) indicating that the
resource has been replaced.</dd>
<dt>gone</dt>
<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.</dd>
</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>
<p>Example:</p>
<pre>
Redirect permanent /one http://example.com/two<br />
Redirect 303 /two http://example.com/other
</pre>
<hr />
<h2><a id="redirectmatch"
name="redirectmatch">RedirectMatch</a></h2>
<p><a href="directive-dict.html#Syntax"
rel="Help"><strong>Syntax:</strong></a> RedirectMatch
[<em>status</em>] <em>regex URL</em><br />
<a href="directive-dict.html#Context"
rel="Help"><strong>Context:</strong></a> server config, virtual
host, directory, .htaccess<br />
<a href="directive-dict.html#Override"
rel="Help"><strong>Override:</strong></a> FileInfo<br />
<a href="directive-dict.html#Status"
rel="Help"><strong>Status:</strong></a> Base<br />
<a href="directive-dict.html#Module"
rel="Help"><strong>Module:</strong></a> mod_alias<br />
<a href="directive-dict.html#Compatibility"
rel="Help"><strong>Compatibility:</strong></a> Available in
Apache 1.3 and later</p>
<p>This directive is equivalent to <a
href="#redirect">Redirect</a>, but makes use of standard
regular expressions, instead of simple prefix matching. The
supplied regular expression is matched against the URL-path,
and if it matches, the server will substitute any parenthesized
matches into the given string and use it as a filename. For
example, to redirect all GIF files to like-named JPEG files on
another server, one might use:</p>
<pre>
RedirectMatch (.*)\.gif$ http://www.anotherserver.com$1.jpg
</pre>
<hr />
<h2><a id="redirecttemp" name="redirecttemp">RedirectTemp
directive</a></h2>
<p>
<a href="directive-dict.html#Syntax"
rel="Help"><strong>Syntax:</strong></a> RedirectTemp
<em>URL-path URL</em><br />
<a href="directive-dict.html#Context"
rel="Help"><strong>Context:</strong></a> server config, virtual
host, directory, .htaccess<br />
<a href="directive-dict.html#Override"
rel="Help"><strong>Override:</strong></a> FileInfo<br />
<a href="directive-dict.html#Status"
rel="Help"><strong>Status:</strong></a> Base<br />
<a href="directive-dict.html#Module"
rel="Help"><strong>Module:</strong></a> mod_alias<br />
<a href="directive-dict.html#Compatibility"
rel="Help"><strong>Compatibility:</strong></a> This directive
is only available in Apache 1.2 and later</p>
<p>This directive makes the client know that the Redirect is
only temporary (status 302). Exactly equivalent to
<code>Redirect temp</code>.</p>
<hr />
<h2><a id="redirectperm" name="redirectperm">RedirectPermanent
directive</a></h2>
<p>
<a href="directive-dict.html#Syntax"
rel="Help"><strong>Syntax:</strong></a> RedirectPermanent
<em>URL-path URL</em><br />
<a href="directive-dict.html#Context"
rel="Help"><strong>Context:</strong></a> server config, virtual
host, directory, .htaccess<br />
<a href="directive-dict.html#Override"
rel="Help"><strong>Override:</strong></a> FileInfo<br />
<a href="directive-dict.html#Status"
rel="Help"><strong>Status:</strong></a> Base<br />
<a href="directive-dict.html#Module"
rel="Help"><strong>Module:</strong></a> mod_alias<br />
<a href="directive-dict.html#Compatibility"
rel="Help"><strong>Compatibility:</strong></a> This directive
is only available in Apache 1.2 and later</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 id="scriptalias" name="scriptalias">ScriptAlias
directive</a></h2>
<p>
<a href="directive-dict.html#Syntax"
rel="Help"><strong>Syntax:</strong></a> ScriptAlias
<em>URL-path file-path</em>|<em>directory-path</em><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> Base<br />
<a href="directive-dict.html#Module"
rel="Help"><strong>Module:</strong></a> 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 that will be
processed by <a href="mod_cgi.html">mod_cgi</a>'s cgi-script
handler. URLs with a (%-decoded) path beginning with
<em>URL-path</em> will be mapped to scripts beginning with the
second argument which is a full pathname in the local
filesystem.</p>
<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>
<hr />
<h2><a id="scriptaliasmatch"
name="scriptaliasmatch">ScriptAliasMatch</a></h2>
<p><a href="directive-dict.html#Syntax"
rel="Help"><strong>Syntax:</strong></a> ScriptAliasMatch
<em>regex file-path</em>|<em>directory-path</em><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> Base<br />
<a href="directive-dict.html#Module"
rel="Help"><strong>Module:</strong></a> mod_alias<br />
<a href="directive-dict.html#Compatibility"
rel="Help"><strong>Compatibility:</strong></a> Available in
Apache 1.3 and later</p>
<p>This directive is equivalent to <a
href="#scriptalias">ScriptAlias</a>, but makes use of standard
regular expressions, instead of simple prefix matching. The
supplied regular expression is matched against the URL-path,
and if it matches, the server will substitute any parenthesized
matches into the given string and use it as a filename. For
example, to activate the standard <code>/cgi-bin</code>, one
might use:</p>
<pre>
ScriptAliasMatch ^/cgi-bin(.*) /usr/local/apache/cgi-bin$1
</pre>
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