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Thanks for the explanation
I still think that the patch can be simplified, not using path lengths and the "found" flag
collapsed_path = _url_collapse_path(self.path)
for head in self.cgi_directories:
 if head==collapsed_path:
 self.cgi_info = (head,'')
 return True
 elif collapsed_path.startswith(head) \
 and collapsed_path[len(head)]=='/':
 self.cgi_info = head, collapsed_path[len(head)+1:]
 return True
return False
BTW the last "return False" is rather useless since is_cgi() is only used in tests like "if is_cgi()"