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This module provides for mapping different parts of the host filesystem in the document tree, and for URL redirection.
Status: Base
Source File: mod_alias.c
Module Identifier:
alias_module
The directives contained in this module allow for
manipulation and control of URLs as requests arrive at the
server. The Alias and ScriptAlias
directives are used to map between URLs and filesystem paths.
This allows for content which is not directly under the DocumentRoot to
be served as part of the web document tree. The
ScriptAlias directive has the additional effect of
marking the target directory as containing only CGI
scripts.
The Redirect 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.
A more powerful and flexible set of directives for
manipulating URLs is contained in the mod_rewrite
module.
Syntax: Alias URL-path
file-path|directory-path
Context: server config, virtual
host
Status: Base
Module: mod_alias
The Alias directive allows documents to be stored in the local filesystem other than under the DocumentRoot. URLs with a (%-decoded) path beginning with url-path will be mapped to local files beginning with directory-filename.
Example:
Alias /image /ftp/pub/image
A request for http://myserver/image/foo.gif would cause the server to return the file /ftp/pub/image/foo.gif.
Note that if you include a trailing / on the
url-path then the server will require a trailing / in
order to expand the alias. That is, if you use Alias
/icons/ /usr/local/apache/icons/ then the url
/icons will not be aliased.
Note that you may need to specify additional <Directory>
sections which cover the destination of aliases.
Aliasing occurs before <Directory> sections
are checked, so only the destination of aliases are affected.
(Note however <Location>
sections are run through once before aliases are performed, so
they will apply.)
See also ScriptAlias.
Syntax: AliasMatch regex
file-path|directory-path
Context: server config, virtual
host
Status: Base
Module: mod_alias
Compatibility: Available in
Apache 1.3 and later
This directive is equivalent to Alias,
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
/icons directory, one might use:
AliasMatch ^/icons(.*) /usr/local/apache/icons$1
Syntax: Redirect
[status] URL-path URL
Context: server config, virtual
host, directory, .htaccess
Override: FileInfo
Status: Base
Module: mod_alias
Compatibility: The directory
and .htaccess context's are only available in versions 1.1 and
later. The status argument is only available in Apache
1.2 or later.
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. URL-path a (%-decoded) path; any requests for documents beginning with this path will be returned a redirect error to a new (%-encoded) URL beginning with URL.
Example:
Redirect /service http://foo2.bar.com/service
If the client requests http://myserver/service/foo.txt, it will be told to access http://foo2.bar.com/service/foo.txt instead.
Note: Redirect directives take precedence over Alias and ScriptAlias directives, irrespective of their ordering in the configuration file. Also, URL-path must be an absolute path, not a relative path, even when used with .htaccess files or inside of <Directory> sections.
If no status argument is given, the redirect will be "temporary" (HTTP status 302). This indicates to the client that the resource has moved temporarily. The status argument can be used to return other HTTP status codes:
Other status codes can be returned by giving the numeric
status code as the value of status. If the status is
between 300 and 399, the url argument must be present,
otherwise it must be omitted. Note that the status must be
known to the Apache code (see the function
send_error_response in http_protocol.c).
Example:
Redirect permanent /one http://example.com/two
Redirect 303 /two http://example.com/other
Syntax: RedirectMatch
[status] regex URL
Context: server config, virtual
host, directory, .htaccess
Override: FileInfo
Status: Base
Module: mod_alias
Compatibility: Available in
Apache 1.3 and later
This directive is equivalent to Redirect, 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:
RedirectMatch (.*)\.gif$ http://www.anotherserver.com$1.jpg
Syntax: RedirectTemp
URL-path URL
Context: server config, virtual
host, directory, .htaccess
Override: FileInfo
Status: Base
Module: mod_alias
Compatibility: This directive
is only available in Apache 1.2 and later
This directive makes the client know that the Redirect is
only temporary (status 302). Exactly equivalent to
Redirect temp.
Syntax: RedirectPermanent
URL-path URL
Context: server config, virtual
host, directory, .htaccess
Override: FileInfo
Status: Base
Module: mod_alias
Compatibility: This directive
is only available in Apache 1.2 and later
This directive makes the client know that the Redirect is
permanent (status 301). Exactly equivalent to Redirect
permanent.
Syntax: ScriptAlias
URL-path file-path|directory-path
Context: server config, virtual
host
Status: Base
Module: mod_alias
The ScriptAlias directive has the same behavior as the Alias directive, except that in addition it marks the target directory as containing CGI scripts that will be processed by mod_cgi's cgi-script handler. URLs with a (%-decoded) path beginning with URL-path will be mapped to scripts beginning with the second argument which is a full pathname in the local filesystem.
Example:
ScriptAlias /cgi-bin/ /web/cgi-bin/
A request for http://myserver/cgi-bin/foo would cause the server to run the script /web/cgi-bin/foo.
Syntax: ScriptAliasMatch
regex file-path|directory-path
Context: server config, virtual
host
Status: Base
Module: mod_alias
Compatibility: Available in
Apache 1.3 and later
This directive is equivalent to ScriptAlias, 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 /cgi-bin, one
might use:
ScriptAliasMatch ^/cgi-bin(.*) /usr/local/apache/cgi-bin$1
