PATH_INFO: /urldemo/aaa/bbb/ccc
QUERY_STRING: qrs=abc+def%20ghi&tuv=%22%3C%5D
cgi.parse_qs() yields: {'qrs': ['abc def ghi'], 'tuv': ['"<]']}

wsgiref.util.guess_scheme(environ): http
wsgiref.util.request_uri(environ): http://boodebr.appspot.com/urldemo/aaa/bbb/ccc?qrs=abc+def%20ghi&tuv=%22%3C%5D
wsgiref.util.application_uri(environ): http://boodebr.appspot.com/

Splitting PATH_INFO into parts with wsgiref.util.shift_path_info(environ):
    name: urldemo
    name: aaa
    name: bbb
    name: ccc