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5 --><title>mod_alias- Apache HTTP Server</title><link href="../style/manual.css" type="text/css" rel="stylesheet"/></head><body><blockquote><div align="center"><img src="../images/sub.gif" alt="[APACHE DOCUMENTATION]"/><h3>Apache HTTP Server Version 2.0</h3></div><h1 align="center">Apache Module mod_alias</h1><table cellspacing="1" cellpadding="0" bgcolor="#cccccc"><tr><td><table bgcolor="#ffffff"><tr><td valign="top"><span class="help">Description:</span></td><td>Provides for mapping different parts of the host
6 filesystem in the document tree and for URL redirection</td></tr><tr><td><a href="module-dict.html#Status" class="help">Status:</a></td><td>Base</td></tr><tr><td><a href="module-dict.html#ModuleIdentifier" class="help">Module Identifier:</a></td><td>alias_module</td></tr></table></td></tr></table><h2>Summary</h2>
7 <p>The directives contained in this module allow for manipulation
8 and control of URLs as requests arrive at the server. The
9 <a href="#alias" class="directive"><code class="directive">Alias</code></a> and <a href="#scriptalias" class="directive"><code class="directive">ScriptAlias</code></a> directives are used to
10 map between URLs and filesystem paths. This allows for content
11 which is not directly under the <a href="core.html#documentroot" class="directive"><code class="directive">DocumentRoot</code></a> served as part of the web
12 document tree. The <a href="#scriptalias" class="directive"><code class="directive">ScriptAlias</code></a> directive has the
13 additional effect of marking the target directory as containing
16 <p>The <a href="#redirect" class="directive"><code class="directive">Redirect</code></a>
17 directives are used to instruct clients to make a new request with
18 a different URL. They are often used when a resource has moved to
20 <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="#redirectpermanent">RedirectPermanent</a></li><li><a href="#redirecttemp">RedirectTemp</a></li><li><a href="#scriptalias">ScriptAlias</a></li><li><a href="#scriptaliasmatch">ScriptAliasMatch</a></li></ul><p><strong>See also </strong></p><ul><li><code><a href="mod_rewrite.html">mod_rewrite</a></code></li><li><a href="../urlmapping.html">Mapping URLs to the filesystem</a></li></ul><hr/><h2><a name="Alias">Alias</a> <a name="alias">Directive</a></h2><table cellpadding="1" cellspacing="0" border="0" bgcolor="#cccccc"><tr><td><table bgcolor="#ffffff"><tr><td><strong>Description: </strong></td><td>Maps URLs to filesystem locations</td></tr><tr><td><a href="directive-dict.html#Syntax" class="help">Syntax:</a></td><td> Alias <em>URL-path
21 file-path</em>|<em>directory-path</em></td></tr><tr><td><a href="directive-dict.html#Context" class="help">Context:</a></td><td>server config, virtual host</td></tr><tr><td><a href="directive-dict.html#Status" class="help">Status:</a></td><td>Base</td></tr><tr><td><a href="directive-dict.html#Module" class="help">Module:</a></td><td>mod_alias</td></tr></table></td></tr></table>
23 <p>The <code class="directive">Alias</code> directive allows documents to
24 be stored in the local filesystem other than under the
25 <a href="core.html#documentroot" class="directive"><code class="directive">DocumentRoot</code></a>. URLs with a
26 (%-decoded) path beginning with <em>url-path</em> will be mapped
27 to local files beginning with <em>directory-filename</em>.</p>
31 <blockquote><table cellpadding="10"><tr><td bgcolor="#eeeeee"><code>Alias /image /ftp/pub/image</code></td></tr></table></blockquote>
33 <p>A request for http://myserver/image/foo.gif would cause the
34 server to return the file /ftp/pub/image/foo.gif.</p>
36 <p>Note that if you include a trailing / on the
37 <em>url-path</em> then the server will require a trailing / in
38 order to expand the alias. That is, if you use <code>Alias
39 /icons/ /usr/local/apache/icons/</code> then the url
40 <code>/icons</code> will not be aliased.</p>
42 <p>Note that you may need to specify additional <a href="core.html#<directory>" class="directive"><code class="directive"><Directory></code></a> sections which cover
43 the <em>destination</em> of aliases. Aliasing occurs before
44 <a href="core.html#<directory>" class="directive"><code class="directive"><Directory></code></a> sections
45 are checked, so only the destination of aliases are affected.
46 (Note however <a href="core.html#<location>" class="directive"><code class="directive"><Location></code></a>
47 sections are run through once before aliases are performed, so
50 <hr/><h2><a name="AliasMatch">AliasMatch</a> <a name="aliasmatch">Directive</a></h2><table cellpadding="1" cellspacing="0" border="0" bgcolor="#cccccc"><tr><td><table bgcolor="#ffffff"><tr><td><strong>Description: </strong></td><td>Maps URLs to filesystem locations using regular
51 expressions</td></tr><tr><td><a href="directive-dict.html#Syntax" class="help">Syntax:</a></td><td>AliasMatch <em>regex
52 file-path</em>|<em>directory-path</em></td></tr><tr><td><a href="directive-dict.html#Context" class="help">Context:</a></td><td>server config, virtual host</td></tr><tr><td><a href="directive-dict.html#Status" class="help">Status:</a></td><td>Base</td></tr><tr><td><a href="directive-dict.html#Module" class="help">Module:</a></td><td>mod_alias</td></tr></table></td></tr></table>
53 <p>This directive is equivalent to <a href="#alias" class="directive"><code class="directive">Alias</code></a>, but makes use of standard
54 regular expressions, instead of simple prefix matching. The
55 supplied regular expression is matched against the URL-path, and
56 if it matches, the server will substitute any parenthesized
57 matches into the given string and use it as a filename. For
58 example, to activate the <code>/icons</code> directory, one might
60 <blockquote><table cellpadding="10"><tr><td bgcolor="#eeeeee"><code>
61 AliasMatch ^/icons(.*) /usr/local/apache/icons$1
62 </code></td></tr></table></blockquote>
63 <hr/><h2><a name="Redirect">Redirect</a> <a name="redirect">Directive</a></h2><table cellpadding="1" cellspacing="0" border="0" bgcolor="#cccccc"><tr><td><table bgcolor="#ffffff"><tr><td><strong>Description: </strong></td><td>Sends an external redirect asking the client to fetch
64 a different URL</td></tr><tr><td><a href="directive-dict.html#Syntax" class="help">Syntax:</a></td><td>Redirect [<em>status</em>] <em>URL-path URL</em></td></tr><tr><td><a href="directive-dict.html#Context" class="help">Context:</a></td><td>server config, virtual host, directory, .htaccess</td></tr><tr><td><a href="directive-dict.html#Override" class="help">Override:</a></td><td>FileInfo</td></tr><tr><td><a href="directive-dict.html#Status" class="help">Status:</a></td><td>Base</td></tr><tr><td><a href="directive-dict.html#Module" class="help">Module:</a></td><td>mod_alias</td></tr></table></td></tr></table>
65 <p>The Redirect directive maps an old URL into a new one. The
66 new URL is returned to the client which attempts to fetch it
67 again with the new address. <em>URL-path</em> a (%-decoded)
68 path; any requests for documents beginning with this path will
69 be returned a redirect error to a new (%-encoded) URL beginning
70 with <em>URL</em>.</p>
74 <blockquote><table cellpadding="10"><tr><td bgcolor="#eeeeee"><code>Redirect /service http://foo2.bar.com/service</code></td></tr></table></blockquote>
76 <p>If the client requests http://myserver/service/foo.txt, it
77 will be told to access http://foo2.bar.com/service/foo.txt
80 <blockquote><table><tr><td bgcolor="#e0e5f5"><p align="center"><strong>Note</strong></p> <p>Redirect directives take precedence over
81 Alias and ScriptAlias directives, irrespective of their ordering in
82 the configuration file. Also, <em>URL-path</em> must be an absolute
83 path, not a relative path, even when used with .htaccess files or
84 inside of <a href="core.html#<directory>" class="directive"><code class="directive"><Directory></code></a>
85 sections.</p></td></tr></table></blockquote>
87 <p>If no <em>status</em> argument is given, the redirect will
88 be "temporary" (HTTP status 302). This indicates to the client
89 that the resource has moved temporarily. The <em>status</em>
90 argument can be used to return other HTTP status codes:</p>
95 <dd>Returns a permanent redirect status (301) indicating that
96 the resource has moved permanently.</dd>
100 <dd>Returns a temporary redirect status (302). This is the
105 <dd>Returns a "See Other" status (303) indicating that the
106 resource has been replaced.</dd>
110 <dd>Returns a "Gone" status (410) indicating that the
111 resource has been permanently removed. When this status is
112 used the <em>url</em> argument should be omitted.</dd>
115 <p>Other status codes can be returned by giving the numeric
116 status code as the value of <em>status</em>. If the status is
117 between 300 and 399, the <em>url</em> argument must be present,
118 otherwise it must be omitted. Note that the status must be
119 known to the Apache code (see the function
120 <code>send_error_response</code> in http_protocol.c).</p>
124 <blockquote><table cellpadding="10"><tr><td bgcolor="#eeeeee"><code>
125 Redirect permanent /one http://example.com/two<br>
126 Redirect 303 /three http://example.com/other
127 </code></td></tr></table></blockquote>
129 <hr/><h2><a name="RedirectMatch">RedirectMatch</a> <a name="redirectmatch">Directive</a></h2><table cellpadding="1" cellspacing="0" border="0" bgcolor="#cccccc"><tr><td><table bgcolor="#ffffff"><tr><td><strong>Description: </strong></td><td>Sends an external redirect asking the client to fetch
130 a different URL based on a regular expression match of the
131 current URL</td></tr><tr><td><a href="directive-dict.html#Syntax" class="help">Syntax:</a></td><td>RedirectMatch [<em>status</em>] <em>regex URL</em></td></tr><tr><td><a href="directive-dict.html#Context" class="help">Context:</a></td><td>server config, virtual host, directory, .htaccess</td></tr><tr><td><a href="directive-dict.html#Override" class="help">Override:</a></td><td>FileInfo</td></tr><tr><td><a href="directive-dict.html#Status" class="help">Status:</a></td><td>Base</td></tr><tr><td><a href="directive-dict.html#Module" class="help">Module:</a></td><td>mod_alias</td></tr></table></td></tr></table>
132 <p>This directive is equivalent to <a href="#redirect" class="directive"><code class="directive">Redirect</code></a>, but makes use of standard
133 regular expressions, instead of simple prefix matching. The
134 supplied regular expression is matched against the URL-path, and
135 if it matches, the server will substitute any parenthesized
136 matches into the given string and use it as a filename. For
137 example, to redirect all GIF files to like-named JPEG files on
138 another server, one might use:</p>
139 <blockquote><table cellpadding="10"><tr><td bgcolor="#eeeeee"><code>
140 RedirectMatch (.*)\.gif$ http://www.anotherserver.com$1.jpg
141 </code></td></tr></table></blockquote>
142 <hr/><h2><a name="RedirectPermanent">RedirectPermanent</a> <a name="redirectpermanent">Directive</a></h2><table cellpadding="1" cellspacing="0" border="0" bgcolor="#cccccc"><tr><td><table bgcolor="#ffffff"><tr><td><strong>Description: </strong></td><td>Sends an external permanent redirect asking the client to fetch
143 a different URL</td></tr><tr><td><a href="directive-dict.html#Syntax" class="help">Syntax:</a></td><td>RedirectPermanent <em>URL-path URL</em></td></tr><tr><td><a href="directive-dict.html#Context" class="help">Context:</a></td><td>server config, virtual host, directory, .htaccess</td></tr><tr><td><a href="directive-dict.html#Override" class="help">Override:</a></td><td>FileInfo</td></tr><tr><td><a href="directive-dict.html#Status" class="help">Status:</a></td><td>Base</td></tr><tr><td><a href="directive-dict.html#Module" class="help">Module:</a></td><td>mod_alias</td></tr></table></td></tr></table>
144 <p>This directive makes the client know that the Redirect is
145 permanent (status 301). Exactly equivalent to <code>Redirect
146 permanent</code>.</p>
147 <hr/><h2><a name="RedirectTemp">RedirectTemp</a> <a name="redirecttemp">Directive</a></h2><table cellpadding="1" cellspacing="0" border="0" bgcolor="#cccccc"><tr><td><table bgcolor="#ffffff"><tr><td><strong>Description: </strong></td><td>Sends an external temporary redirect asking the client to fetch
148 a different URL</td></tr><tr><td><a href="directive-dict.html#Syntax" class="help">Syntax:</a></td><td>RedirectTemp <em>URL-path URL</em></td></tr><tr><td><a href="directive-dict.html#Context" class="help">Context:</a></td><td>server config, virtual host, directory, .htaccess</td></tr><tr><td><a href="directive-dict.html#Override" class="help">Override:</a></td><td>FileInfo</td></tr><tr><td><a href="directive-dict.html#Status" class="help">Status:</a></td><td>Base</td></tr><tr><td><a href="directive-dict.html#Module" class="help">Module:</a></td><td>mod_alias</td></tr></table></td></tr></table>
149 <p>This directive makes the client know that the Redirect is
150 only temporary (status 302). Exactly equivalent to
151 <code>Redirect temp</code>.</p>
152 <hr/><h2><a name="ScriptAlias">ScriptAlias</a> <a name="scriptalias">Directive</a></h2><table cellpadding="1" cellspacing="0" border="0" bgcolor="#cccccc"><tr><td><table bgcolor="#ffffff"><tr><td><strong>Description: </strong></td><td>Maps a URL to a filesystem location and designates the
153 target as a CGI script</td></tr><tr><td><a href="directive-dict.html#Syntax" class="help">Syntax:</a></td><td>ScriptAlias
154 <em>URL-path file-path</em>|<em>directory-path</em></td></tr><tr><td><a href="directive-dict.html#Context" class="help">Context:</a></td><td>server config, virtual host</td></tr><tr><td><a href="directive-dict.html#Status" class="help">Status:</a></td><td>Base</td></tr><tr><td><a href="directive-dict.html#Module" class="help">Module:</a></td><td>mod_alias</td></tr></table></td></tr></table>
155 <p>The <code class="directive">ScriptAlias</code> directive has the same
156 behavior as the <a href="#alias" class="directive"><code class="directive">Alias</code></a>
157 directive, except that in addition it marks the target directory
158 as containing CGI scripts that will be processed by <code><a href="mod_cgi.html">mod_cgi</a></code>'s cgi-script handler. URLs with a
159 (%-decoded) path beginning with <em>URL-path</em> will be mapped
160 to scripts beginning with the second argument which is a full
161 pathname in the local filesystem.</p>
165 <blockquote><table cellpadding="10"><tr><td bgcolor="#eeeeee"><code>ScriptAlias /cgi-bin/ /web/cgi-bin/</code></td></tr></table></blockquote>
167 <p>A request for <code>http://myserver/cgi-bin/foo</code> would cause the
168 server to run the script <code>/web/cgi-bin/foo</code>.</p>
169 <hr/><h2><a name="ScriptAliasMatch">ScriptAliasMatch</a> <a name="scriptaliasmatch">Directive</a></h2><table cellpadding="1" cellspacing="0" border="0" bgcolor="#cccccc"><tr><td><table bgcolor="#ffffff"><tr><td><strong>Description: </strong></td><td>Maps a URL to a filesystem location using a regular expression
170 and designates the target as a CGI script</td></tr><tr><td><a href="directive-dict.html#Syntax" class="help">Syntax:</a></td><td>ScriptAliasMatch
171 <em>regex file-path</em>|<em>directory-path</em></td></tr><tr><td><a href="directive-dict.html#Context" class="help">Context:</a></td><td>server config, virtual host</td></tr><tr><td><a href="directive-dict.html#Status" class="help">Status:</a></td><td>Base</td></tr><tr><td><a href="directive-dict.html#Module" class="help">Module:</a></td><td>mod_alias</td></tr></table></td></tr></table>
172 <p>This directive is equivalent to <a href="#scriptalias" class="directive"><code class="directive">ScriptAlias</code></a>, but makes use of standard
173 regular expressions, instead of simple prefix matching. The
174 supplied regular expression is matched against the URL-path,
175 and if it matches, the server will substitute any parenthesized
176 matches into the given string and use it as a filename. For
177 example, to activate the standard <code>/cgi-bin</code>, one
179 <blockquote><table cellpadding="10"><tr><td bgcolor="#eeeeee"><code>
180 ScriptAliasMatch ^/cgi-bin(.*) /usr/local/apache/cgi-bin$1
181 </code></td></tr></table></blockquote>
182 <hr/></blockquote><h3 align="center">Apache HTTP Server Version 2.0</h3><a href="./"><img src="../images/index.gif" alt="Index"/></a><a href="../"><img src="../images/home.gif" alt="Home"/></a></body></html>