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<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<title>mod_alias - Apache HTTP Server</title>
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<div id="page-content">
<div id="preamble"><h1>Apache Module mod_alias</h1>
<div class="toplang">
<p><span>Available Languages: </span><a href="../en/mod/mod_alias.html" title="English"> en </a> |
<a href="../ja/mod/mod_alias.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> |
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<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Provides for mapping different parts of the host
filesystem in the document tree and for URL redirection</td></tr>
<tr><th><a href="module-dict.html#Status">Status:</a></th><td>Base</td></tr>
<tr><th><a href="module-dict.html#ModuleIdentifier">Module�Identifier:</a></th><td>alias_module</td></tr>
<tr><th><a href="module-dict.html#SourceFile">Source�File:</a></th><td>mod_alias.c</td></tr></table>
<h3>Summary</h3>
<p>The directives contained in this module allow for manipulation
and control of URLs as requests arrive at the server. The
<code class="directive"><a href="#alias">Alias</a></code> and <code class="directive"><a href="#scriptalias">ScriptAlias</a></code> directives are used to
map between URLs and filesystem paths. This allows for content
which is not directly under the <code class="directive"><a href="../mod/core.html#documentroot">DocumentRoot</a></code> served as part of the web
document tree. The <code class="directive"><a href="#scriptalias">ScriptAlias</a></code> directive has the
additional effect of marking the target directory as containing
only CGI scripts.</p>
<p>The <code class="directive"><a href="#redirect">Redirect</a></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><code class="module"><a href="../mod/mod_alias.html">mod_alias</a></code> is designed to handle simple URL
manipulation tasks. For more complicated tasks such as
manipulating the query string, use the tools provided by
<code class="module"><a href="../mod/mod_rewrite.html">mod_rewrite</a></code>.</p>
</div>
<div id="quickview"><h3 class="directives">Directives</h3>
<ul id="toc">
<li><img alt="" src="../images/down.gif" /> <a href="#alias">Alias</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#aliasmatch">AliasMatch</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#redirect">Redirect</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#redirectmatch">RedirectMatch</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#redirectpermanent">RedirectPermanent</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#redirecttemp">RedirectTemp</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#scriptalias">ScriptAlias</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#scriptaliasmatch">ScriptAliasMatch</a></li>
</ul>
<h3>Topics</h3>
<ul id="topics">
<li><img alt="" src="../images/down.gif" /> <a href="#order">Order of Processing</a></li>
</ul><h3>See also</h3>
<ul class="seealso">
<li><code class="module"><a href="../mod/mod_rewrite.html">mod_rewrite</a></code></li>
<li><a href="../urlmapping.html">Mapping URLs to the filesystem</a></li>
</ul></div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
<h2><a name="order" id="order">Order of Processing</a></h2>
<p>Aliases and Redirects occuring in different contexts are processed
like other directives according to standard <a href="../sections.html#mergin">merging rules</a>. But when multiple
Aliases or Redirects occur in the same context (for example, in the
same <code class="directive"><a href="../mod/core.html#virtualhost"><VirtualHost></a></code>
section) they are processed in a particular order.</p>
<p>First, all Redirects are processed before Aliases are processed,
and therefore a request that matches a <code class="directive"><a href="#redirect">Redirect</a></code> or <code class="directive"><a href="#redirectmatch">RedirectMatch</a></code> will never have Aliases
applied. Second, the Aliases and Redirects are processed in the order
they appear in the configuration files, with the first match taking
precedence.</p>
<p>For this reason, when two or more of these directives apply to the
same sub-path, you must list the most specific path first in order for
all the directives to have an effect. For example, the following
configuration will work as expected:</p>
<div class="example"><p><code>
Alias /foo/bar /baz<br />
Alias /foo /gaq
</code></p></div>
<p>But if the above two directives were reversed in order, the
<code>/foo</code> <code class="directive"><a href="#alias">Alias</a></code>
would always match before the <code>/foo/bar</code> <code class="directive"><a href="#alias">Alias</a></code>, so the latter directive would be
ignored.</p>
</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="Alias" id="Alias">Alias</a> <a name="alias" id="alias">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Maps URLs to filesystem locations</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>Alias <var>URL-path</var>
<var>file-path</var>|<var>directory-path</var></code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_alias</td></tr>
</table>
<p>The <code class="directive">Alias</code> directive allows documents to
be stored in the local filesystem other than under the
<code class="directive"><a href="../mod/core.html#documentroot">DocumentRoot</a></code>. URLs with a
(%-decoded) path beginning with <var>url-path</var> will be mapped
to local files beginning with <var>directory-path</var>. The
<var>url-path</var> is case-sensitive, even on case-insenitive
file systems.</p>
<div class="example"><h3>Example:</h3><p><code>
Alias /image /ftp/pub/image
</code></p></div>
<p>A request for <code>http://myserver/image/foo.gif</code> would cause
the server to return the file <code>/ftp/pub/image/foo.gif</code>.</p>
<p>Note that if you include a trailing / on the
<var>url-path</var> then the server will require a trailing / in
order to expand the alias. That is, if you use</p>
<dl><dd><code>Alias /icons/ /usr/local/apache/icons/</code></dd></dl>
<p>then the url <code>/icons</code> will not be aliased.</p>
<p>Note that you may need to specify additional <code class="directive"><a href="../mod/core.html#directory"><Directory></a></code> sections which
cover the <em>destination</em> of aliases. Aliasing occurs before
<code class="directive"><a href="../mod/core.html#directory"><Directory></a></code> sections
are checked, so only the destination of aliases are affected.
(Note however <code class="directive"><a href="../mod/core.html#location"><Location></a></code>
sections are run through once before aliases are performed, so
they will apply.)</p>
<p>In particular, if you are creating an <code>Alias</code> to a
directory outside of your <code class="directive"><a href="../mod/core.html#documentroot">DocumentRoot</a></code>, you may need to explicitly
permit access to the target directory.</p>
<div class="example"><h3>Example:</h3><p><code>
Alias /image /ftp/pub/image<br />
<Directory /ftp/pub/image><br />
<span class="indent">
Order allow,deny<br />
Allow from all<br />
</span>
</Directory>
</code></p></div>
</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="AliasMatch" id="AliasMatch">AliasMatch</a> <a name="aliasmatch" id="aliasmatch">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Maps URLs to filesystem locations using regular
expressions</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>AliasMatch <var>regex</var>
<var>file-path</var>|<var>directory-path</var></code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_alias</td></tr>
</table>
<p>This directive is equivalent to <code class="directive"><a href="#alias">Alias</a></code>, 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>
<div class="example"><p><code>
AliasMatch ^/icons(.*) /usr/local/apache/icons$1
</code></p></div>
<p>It is also possible to construct an alias with case-insensitive
matching of the url-path:</p>
<div class="example"><p><code>
AliasMatch (?i)^/image(.*) /ftp/pub/image$1
</code></p></div>
</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="Redirect" id="Redirect">Redirect</a> <a name="redirect" id="redirect">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Sends an external redirect asking the client to fetch
a different URL</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>Redirect [<var>status</var>] <var>URL-path</var>
<var>URL</var></code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
<tr><th><a href="directive-dict.html#Override">Override:</a></th><td>FileInfo</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_alias</td></tr>
</table>
<p>The Redirect directive maps an old URL into a new one by asking
the client to refetch the resource at the new location.</p>
<p>The old <em>URL-path</em> is a case-sensitive (%-decoded) path
beginning with a slash. A relative path is not allowed. The new
<em>URL</em> should be an absolute URL beginning with a scheme and
hostname.</p>
<div class="example"><h3>Example:</h3><p><code>
Redirect /service http://foo2.bar.com/service
</code></p></div>
<p>If the client requests <code>http://myserver/service/foo.txt</code>, it
will be told to access <code>http://foo2.bar.com/service/foo.txt</code>
instead.</p>
<div class="note"><h3>Note</h3>
<p>Redirect directives take precedence over
Alias and ScriptAlias directives, irrespective of their ordering in
the configuration file. Also, <var>URL-path</var> must be a fully
qualified URL, not a relative path, even when used with .htaccess files or
inside of <code class="directive"><a href="../mod/core.html#directory"><Directory></a></code>
sections.</p></div>
<p>If no <var>status</var> argument is given, the redirect will
be "temporary" (HTTP status 302). This indicates to the client
that the resource has moved temporarily. The <var>status</var>
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 <var>URL</var> argument should be omitted.</dd>
</dl>
<p>Other status codes can be returned by giving the numeric
status code as the value of <var>status</var>. If the status is
between 300 and 399, the <var>URL</var> 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>
<div class="example"><h3>Example:</h3><p><code>
Redirect permanent /one http://example.com/two<br />
Redirect 303 /three http://example.com/other
</code></p></div>
</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="RedirectMatch" id="RedirectMatch">RedirectMatch</a> <a name="redirectmatch" id="redirectmatch">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Sends an external redirect based on a regular expression match
of the current URL</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>RedirectMatch [<var>status</var>] <var>regex</var>
<var>URL</var></code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
<tr><th><a href="directive-dict.html#Override">Override:</a></th><td>FileInfo</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_alias</td></tr>
</table>
<p>This directive is equivalent to <code class="directive"><a href="#redirect">Redirect</a></code>, 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>
<div class="example"><p><code>
RedirectMatch (.*)\.gif$ http://www.anotherserver.com$1.jpg
</code></p></div>
</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="RedirectPermanent" id="RedirectPermanent">RedirectPermanent</a> <a name="redirectpermanent" id="redirectpermanent">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Sends an external permanent redirect asking the client to fetch
a different URL</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>RedirectPermanent <var>URL-path</var> <var>URL</var></code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
<tr><th><a href="directive-dict.html#Override">Override:</a></th><td>FileInfo</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_alias</td></tr>
</table>
<p>This directive makes the client know that the Redirect is
permanent (status 301). Exactly equivalent to <code>Redirect
permanent</code>.</p>
</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="RedirectTemp" id="RedirectTemp">RedirectTemp</a> <a name="redirecttemp" id="redirecttemp">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Sends an external temporary redirect asking the client to fetch
a different URL</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>RedirectTemp <var>URL-path</var> <var>URL</var></code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
<tr><th><a href="directive-dict.html#Override">Override:</a></th><td>FileInfo</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_alias</td></tr>
</table>
<p>This directive makes the client know that the Redirect is
only temporary (status 302). Exactly equivalent to
<code>Redirect temp</code>.</p>
</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="ScriptAlias" id="ScriptAlias">ScriptAlias</a> <a name="scriptalias" id="scriptalias">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Maps a URL to a filesystem location and designates the
target as a CGI script</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ScriptAlias <var>URL-path</var>
<var>file-path</var>|<var>directory-path</var></code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_alias</td></tr>
</table>
<p>The <code class="directive">ScriptAlias</code> directive has the same
behavior as the <code class="directive"><a href="#alias">Alias</a></code>
directive, except that in addition it marks the target directory
as containing CGI scripts that will be processed by <code class="module"><a href="../mod/mod_cgi.html">mod_cgi</a></code>'s cgi-script handler. URLs with a case-sensitive
(%-decoded) path beginning with <var>URL-path</var> will be mapped
to scripts beginning with the second argument, which is a full
pathname in the local filesystem.</p>
<div class="example"><h3>Example:</h3><p><code>
ScriptAlias /cgi-bin/ /web/cgi-bin/
</code></p></div>
<p>A request for <code>http://myserver/cgi-bin/foo</code> would cause the
server to run the script <code>/web/cgi-bin/foo</code>. This configuration
is essentially equivalent to:</p>
<div class="example"><p><code>
Alias /cgi-bin/ /web/cgi-bin/<br />
<Location /cgi-bin ><br />
<span class="indent">
SetHandler cgi-script<br />
Options +ExecCGI<br />
</span>
</Location>
</code></p></div>
<div class="warning">It is safer to avoid placing CGI scripts under the
<code class="directive"><a href="../mod/core.html#documentroot">DocumentRoot</a></code> in order to
avoid accidentally revealing their source code if the
configuration is ever changed. The
<code class="directive">ScriptAlias</code> makes this easy by mapping a
URL and designating CGI scripts at the same time. If you do
choose to place your CGI scripts in a directory already
accessible from the web, do not use
<code class="directive">ScriptAlias</code>. Instead, use <code class="directive"><a href="../mod/core.html#directory"><Directory></a></code>, <code class="directive"><a href="../mod/core.html#sethandler">SetHandler</a></code>, and <code class="directive"><a href="../mod/core.html#options">Options</a></code> as in:
<div class="example"><p><code>
<Directory /usr/local/apache2/htdocs/cgi-bin ><br />
<span class="indent">
SetHandler cgi-script<br />
Options ExecCGI<br />
</span>
</Directory>
</code></p></div>
This is necessary since multiple <var>URL-paths</var> can map
to the same filesystem location, potentially bypassing the
<code class="directive">ScriptAlias</code> and revealing the source code
of the CGI scripts if they are not restricted by a
<code class="directive"><a href="../mod/core.html#directory">Directory</a></code> section.</div>
<h3>See also</h3>
<ul>
<li><a href="../howto/cgi.html">CGI Tutorial</a></li>
</ul>
</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="ScriptAliasMatch" id="ScriptAliasMatch">ScriptAliasMatch</a> <a name="scriptaliasmatch" id="scriptaliasmatch">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Maps a URL to a filesystem location using a regular expression
and designates the target as a CGI script</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ScriptAliasMatch <var>regex</var>
<var>file-path</var>|<var>directory-path</var></code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Base</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_alias</td></tr>
</table>
<p>This directive is equivalent to <code class="directive"><a href="#scriptalias">ScriptAlias</a></code>, 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>
<div class="example"><p><code>
ScriptAliasMatch ^/cgi-bin(.*) /usr/local/apache/cgi-bin$1
</code></p></div>
</div>
</div>
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