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416 lines
12 KiB
HTML
416 lines
12 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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<HTML>
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<HEAD>
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<TITLE>Apache module mod_alias</TITLE>
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<!--#include virtual="header.html" -->
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<H1 ALIGN="CENTER">Module mod_alias</H1>
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<P>
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This module provides for mapping different parts of the
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host filesystem in the document tree, and for URL redirection.
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</P>
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<P><A
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HREF="module-dict.html#Status"
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REL="Help"
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><STRONG>Status:</STRONG></A> Base
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<BR>
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<A
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HREF="module-dict.html#SourceFile"
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REL="Help"
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><STRONG>Source File:</STRONG></A> mod_alias.c
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<BR>
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<A
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HREF="module-dict.html#ModuleIdentifier"
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REL="Help"
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><STRONG>Module Identifier:</STRONG></A> alias_module
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</P>
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<H2>Summary</H2>
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<P>The directives contained in this module allow for manipulation and
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control of URLs as requests arrive at the server. The
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<CODE>Alias</CODE> and <CODE>ScriptAlias</CODE> directives are used to
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map between URLs and filesystem paths. This allows for content which
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is not directly under the <A
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HREF="core.html#documentroot"><CODE>DocumentRoot</CODE></A> to be
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served as part of the web document tree. The <CODE>ScriptAlias</CODE>
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directive has the additional effect of marking the target directory as
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containing only CGI scripts.
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<P>The <CODE>Redirect</CODE> directives are used to instruct clients
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to make a new request with a different URL. They are often used
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when a resource has moved to a new location.
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<P>A more powerful and flexible set of directives for manipulating
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URLs is contained in the <A
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HREF="mod_rewrite.html"><CODE>mod_rewrite</CODE></A> module.
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<H2>Directives</H2>
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<UL>
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<LI><A HREF="#alias">Alias</A>
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<LI><A HREF="#aliasmatch">AliasMatch</A>
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<LI><A HREF="#redirect">Redirect</A>
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<LI><A HREF="#redirectmatch">RedirectMatch</A>
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<LI><A HREF="#redirecttemp">RedirectTemp</A>
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<LI><A HREF="#redirectperm">RedirectPermanent</A>
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<LI><A HREF="#scriptalias">ScriptAlias</A>
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<LI><A HREF="#scriptaliasmatch">ScriptAliasMatch</A>
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</UL>
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<HR>
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<H2><A NAME="alias">Alias directive</A></H2>
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<P>
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<!--%plaintext <?INDEX {\tt Alias} directive> -->
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<A
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HREF="directive-dict.html#Syntax"
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REL="Help"
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><STRONG>Syntax:</STRONG></A> Alias <EM>url-path directory-filename</EM><BR>
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<A
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HREF="directive-dict.html#Context"
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REL="Help"
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><STRONG>Context:</STRONG></A> server config, virtual host<BR>
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<A
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HREF="directive-dict.html#Status"
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REL="Help"
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><STRONG>Status:</STRONG></A> Base<BR>
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<A
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HREF="directive-dict.html#Module"
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REL="Help"
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><STRONG>Module:</STRONG></A> mod_alias
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</P>
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<P>
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The Alias directive allows documents to be stored in the local filesystem
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other than under the <A HREF="core.html#documentroot">DocumentRoot</A>.
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URLs with a (%-decoded) path beginning with <EM>url-path</EM> will be
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mapped to local files beginning with <EM>directory-filename</EM>.
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<P>
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Example:
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</P>
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<BLOCKQUOTE><CODE>Alias /image /ftp/pub/image</CODE></BLOCKQUOTE>
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<P>
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A request for http://myserver/image/foo.gif would cause the server to
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return the file /ftp/pub/image/foo.gif.
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</P>
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<P>
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Note that if you include a trailing / on the <EM>url-path</EM> then the
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server will require a trailing / in order to expand the alias. That is,
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if you use <CODE>Alias /icons/ /usr/local/apache/icons/</CODE> then
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the url <CODE>/icons</CODE> will not be aliased.
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</P>
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<P>
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Note that you may need to specify additional
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<A HREF="core.html#directory"><CODE><Directory></CODE></A> sections
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which cover the <EM>destination</EM> of aliases. Aliasing occurs
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before <CODE><Directory></CODE> sections are checked, so only
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the destination of aliases are affected. (Note however
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<A HREF="core.html#location"><CODE><Location></CODE></A>
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sections are run through once before aliases are performed, so they
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will apply.)
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<P>
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See also <A HREF="#scriptalias">ScriptAlias</A>.
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</P>
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<HR>
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<H2><A NAME="aliasmatch">AliasMatch</A></H2>
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<P>
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<A
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HREF="directive-dict.html#Syntax"
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REL="Help"
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><STRONG>Syntax:</STRONG></A> AliasMatch <EM>regex directory-filename</EM><BR>
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<A
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HREF="directive-dict.html#Context"
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REL="Help"
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><STRONG>Context:</STRONG></A> server config, virtual host<BR>
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<A
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HREF="directive-dict.html#Status"
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REL="Help"
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><STRONG>Status:</STRONG></A> Base<BR>
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<A
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HREF="directive-dict.html#Module"
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REL="Help"
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><STRONG>Module:</STRONG></A> mod_alias
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</P>
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<P>This directive is equivalent to <A HREF="#alias">Alias</A>, but
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makes use of standard regular expressions, instead of simple prefix
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matching. The supplied regular expression is matched against the URL,
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and if it matches, the server will substitute any parenthesized
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matches into the given string and use it as a filename. For example,
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to activate the <CODE>/icons</CODE> directory, one might use:
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<PRE>
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AliasMatch ^/icons(.*) /usr/local/apache/icons$1
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</PRE>
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</P>
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<HR>
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<H2><A NAME="redirect">Redirect directive</A></H2>
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<P>
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<!--%plaintext <?INDEX {\tt Redirect} directive> -->
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<A
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HREF="directive-dict.html#Syntax"
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REL="Help"
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><STRONG>Syntax:</STRONG></A> Redirect [<EM>status</EM>]
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<EM>url-path url</EM><BR>
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<A
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HREF="directive-dict.html#Context"
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REL="Help"
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><STRONG>Context:</STRONG></A> server config, virtual host, directory,
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.htaccess<BR>
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<A
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HREF="directive-dict.html#Override"
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REL="Help"
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><STRONG>Override:</STRONG></A> FileInfo<BR>
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<A
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HREF="directive-dict.html#Status"
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REL="Help"
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><STRONG>Status:</STRONG></A> Base<BR>
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<A
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HREF="directive-dict.html#Module"
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REL="Help"
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><STRONG>Module:</STRONG></A> mod_alias
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</P>
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<P>
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The Redirect directive maps an old URL into a new one. The new URL is returned
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to the client which attempts to fetch it again with the new address.
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<EM>Url-path</EM> a (%-decoded) path; any requests for documents beginning with
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this path will be returned a redirect error to a new (%-encoded) url
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beginning with <EM>url</EM>.
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</P>
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<P>
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Example:
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</P>
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<BLOCKQUOTE><CODE>Redirect /service
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http://foo2.bar.com/service</CODE></BLOCKQUOTE>
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<P>
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If the client requests http://myserver/service/foo.txt, it will be told to
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access http://foo2.bar.com/service/foo.txt instead.
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</P>
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<P>
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<STRONG>Note:</STRONG> Redirect directives take precedence over Alias
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and ScriptAlias
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directives, irrespective of their ordering in the configuration file. Also,
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<EM>Url-path</EM> must be an absolute path, not a relative path, even
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when used with .htaccess files or inside of <Directory> sections.
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</P>
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<P>
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If no <EM>status</EM> argument is given, the redirect will be
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"temporary" (HTTP status 302). This indicates to the client that the
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resource has moved temporarily. The <EM>status</EM>
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argument can be used to return other HTTP status codes:
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<P>
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<DL>
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<DT>permanent
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<DD>Returns a permanent redirect status (301) indicating that
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the resource has moved permanently.
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<DT>temp
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<DD>Returns a temporary redirect status (302). This is the
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default.
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<DT>seeother
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<DD>Returns a "See Other" status (303) indicating that
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the resource has been replaced.
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<DT>gone
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<DD>Returns a "Gone" status (410) indicating that the resource
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has been permanently removed. When this status is used the <EM>url</EM>
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argument should be omitted.
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</DL>
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<P>
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Other status codes can be returned by giving the numeric status code
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as the value of <EM>status</EM>. If the status is between 300 and 399,
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the <EM>url</EM> argument must be present, otherwise it must be
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omitted. Note that the status must be known to the Apache code (see
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the function <CODE>send_error_response</CODE> in http_protocol.c).
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</P>
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<HR>
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<H2><A NAME="redirectmatch">RedirectMatch</A></H2>
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<P>
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<A
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HREF="directive-dict.html#Syntax"
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REL="Help"
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><STRONG>Syntax:</STRONG></A>
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RedirectMatch [<EM>status</EM>] <EM>regex url</EM>
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<BR>
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<A
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HREF="directive-dict.html#Context"
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REL="Help"
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><STRONG>Context:</STRONG></A> server config, virtual host, directory,
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.htaccess<BR>
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<A
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HREF="directive-dict.html#Override"
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REL="Help"
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><STRONG>Override:</STRONG></A> FileInfo<BR>
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<A
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HREF="directive-dict.html#Status"
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REL="Help"
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><STRONG>Status:</STRONG></A> Base<BR>
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<A
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HREF="directive-dict.html#Module"
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REL="Help"
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><STRONG>Module:</STRONG></A> mod_alias
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</P>
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<P>This directive is equivalent to <A HREF="#alias">Redirect</A>, but
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makes use of standard regular expressions, instead of simple prefix
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matching. The supplied regular expression is matched against the URL,
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and if it matches, the server will substitute any parenthesized
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matches into the given string and use it as a filename. For example,
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to redirect all GIF files to like-named JPEG files on another server,
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one might use:
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<PRE>
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RedirectMatch (.*)\.gif$ http://www.anotherserver.com$1.jpg
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</PRE>
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</P>
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<HR>
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<H2><A NAME="redirecttemp">RedirectTemp directive</A></H2>
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<P>
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<!--%plaintext <?INDEX {\tt Redirect} directive> -->
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<A
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HREF="directive-dict.html#Syntax"
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REL="Help"
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><STRONG>Syntax:</STRONG></A> RedirectTemp <EM>url-path url</EM><BR>
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<A
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HREF="directive-dict.html#Context"
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REL="Help"
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><STRONG>Context:</STRONG></A> server config, virtual host, directory,
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.htaccess<BR>
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<A
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HREF="directive-dict.html#Override"
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REL="Help"
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><STRONG>Override:</STRONG></A> FileInfo<BR>
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<A
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HREF="directive-dict.html#Status"
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REL="Help"
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><STRONG>Status:</STRONG></A> Base<BR>
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<A
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HREF="directive-dict.html#Module"
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REL="Help"
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><STRONG>Module:</STRONG></A> mod_alias
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</P>
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<P>
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This directive makes the client know that the Redirect is only
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temporary (status 302). Exactly equivalent to <CODE>Redirect
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temp</CODE>.
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</P>
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<HR>
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<H2><A NAME="redirectperm">RedirectPermanent directive</A></H2>
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<P>
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<!--%plaintext <?INDEX {\tt Redirect} directive> -->
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<A
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HREF="directive-dict.html#Syntax"
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REL="Help"
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><STRONG>Syntax:</STRONG></A> RedirectPermanent <EM>url-path url</EM><BR>
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<A
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HREF="directive-dict.html#Context"
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REL="Help"
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><STRONG>Context:</STRONG></A> server config, virtual host, directory,
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.htaccess<BR>
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<A
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HREF="directive-dict.html#Override"
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REL="Help"
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><STRONG>Override:</STRONG></A> FileInfo<BR>
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<A
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HREF="directive-dict.html#Status"
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REL="Help"
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><STRONG>Status:</STRONG></A> Base<BR>
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<A
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HREF="directive-dict.html#Module"
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REL="Help"
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><STRONG>Module:</STRONG></A> mod_alias
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</P>
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<P>
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This directive makes the client know that the Redirect is permanent
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(status 301). Exactly equivalent to <CODE>Redirect permanent</CODE>.
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</P>
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<HR>
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<H2><A NAME="scriptalias">ScriptAlias directive</A></H2>
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<P>
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<!--%plaintext <?INDEX {\tt ScriptAlias} directive> -->
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<A
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HREF="directive-dict.html#Syntax"
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REL="Help"
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><STRONG>Syntax:</STRONG></A> ScriptAlias <EM>url-path directory-filename</EM>
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<BR>
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<A
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HREF="directive-dict.html#Context"
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REL="Help"
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><STRONG>Context:</STRONG></A> server config, virtual host<BR>
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<A
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HREF="directive-dict.html#Status"
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REL="Help"
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><STRONG>Status:</STRONG></A> Base<BR>
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<A
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HREF="directive-dict.html#Module"
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REL="Help"
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><STRONG>Module:</STRONG></A> mod_alias
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</P>
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<P>
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The ScriptAlias directive has the same behavior as the
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<A HREF="#alias">Alias</A> directive, except that in addition it
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marks the target directory as containing CGI scripts.
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URLs with a (%-decoded) path beginning with <EM>url-path</EM> will be
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mapped to scripts beginning with <EM>directory-filename</EM>.
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<P>
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Example:
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</P>
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<BLOCKQUOTE><CODE>ScriptAlias /cgi-bin/ /web/cgi-bin/</CODE></BLOCKQUOTE>
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<P>
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A request for http://myserver/cgi-bin/foo would cause the server to
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run the script /web/cgi-bin/foo.
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</P>
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<HR>
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<H2><A NAME="scriptaliasmatch">ScriptAliasMatch</A></H2>
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<P>
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<A
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HREF="directive-dict.html#Syntax"
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REL="Help"
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><STRONG>Syntax:</STRONG></A> ScriptAliasMatch
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<EM>regex directory-filename</EM><BR>
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<A
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HREF="directive-dict.html#Context"
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REL="Help"
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><STRONG>Context:</STRONG></A> server config, virtual host<BR>
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<A
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HREF="directive-dict.html#Status"
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REL="Help"
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><STRONG>Status:</STRONG></A> Base<BR>
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<A
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HREF="directive-dict.html#Module"
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REL="Help"
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><STRONG>Module:</STRONG></A> mod_alias
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</P>
|
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|
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<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,
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|
and if it matches, the server will substitute any parenthesized
|
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matches into the given string and use it as a filename. For example,
|
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to activate the standard <CODE>/cgi-bin</CODE>, one might use:
|
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<PRE>
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ScriptAliasMatch ^/cgi-bin(.*) /usr/local/apache/cgi-bin$1
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</PRE>
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</P>
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<!--#include virtual="footer.html" -->
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</BODY>
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</HTML>
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