mod_cache: From RFC3986 (section 6.2.3.) if a URI contains an

authority component and an empty path, the empty path is to be equivalent
to "/". It explicitly cites the following four URIs as equivalents:
  http://example.com
  http://example.com/
  http://example.com:/
  http://example.com:80/


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@450063 13f79535-47bb-0310-9956-ffa450edef68