code: def get_preferred_path(self):
          
          if self.path in ("", "/"):
              return "/"
          # Append '/' for collections
          if self.is_collection and not self.path.endswith("/"):
              return self.path + "/"
          # TODO: handle case-sensitivity, depending on OS
          # (FileSystemProvider could do this with os.path:
          # (?) on unix we can assume that the path already matches exactly the case of filepath
          # on windows we could use path.lower() or get the real case from the
          # file system
          return self.path
docs: Return preferred mapping for a resource mapping.
  
          Different URLs may map to the same resource, e.g.:
              '/a/b' == '/A/b' == '/a/b/'
          get_preferred_path() returns the same value for all these variants, e.g.:
              '/a/b/'   (assuming resource names considered case insensitive)
  
          @param path: a UTF-8 encoded, unquoted byte string.
          @return: a UTF-8 encoded, unquoted byte string.