http://www.example.com/one/two/three/four.html

##</code><code>##

/two/three/four.html

##</code><code>##

http://www.example.com/one/two.html?arg1=one&arg2=two

$ENV{PATH_INFO}    is "/one/two.html"
$ENV{QUERY_STRING} is "arg1=one&arg2=two"