Apache Reference: mod_alias, Alias
Map a URL Prefix to a File Name Prefix
Syntax: Alias url-prefix A
Example: Alias /image /www/image
Since: Apache 1.0
This directive allows documents to be stored in the local
file system in a location other than under DocumentRoot. URLs whose
path begins with url-prefix will be mapped to local
files whose path begins with fs-prefix. For instance, in the preceding
example, a request for http://thisserver/image/foo/==bar.gif would
cause the server to return the file F.