mod_alias.cfile, and is compiled in by default. It provides for mapping different parts of the host filesystem in the the document tree, and for URL redirection.
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:
A request for http://myserver/image/foo.gif would cause the server to return the file /ftp/pub/image/foo.gif.
Alias /image /ftp/pub/image
See also ScriptAlias.
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:
If the client requests http://myserver/service/foo.txt, it will be told to access http://foo2.bar.com/service/foo.txt instead.
Redirect /service http://foo2.bar.com/service
Note: Redirect directives take precedence over Alias and ScriptAlias directives, irrespective of their ordering in the configuration file.
The ScriptAlias directive has the same behaviour as the Alias directive, except that in addition it marks the target directory as containing CGI scripts. URLs with a (%-decoded) path beginning with url-path will be mapped to scripts beginning with directory-filename. Example:
A request for http://myserver/cgi-bin/foo would cause the server to run the script /web/cgi-bin/foo.
ScriptAlias /cgi-bin/ /web/cgi-bin/