# File lib_core/rucy/request.rb, line 136
    def subpath(script_name)
      if (script_name == '/') then
        script_name = ''
      end
      len = script_name.length
      if (@path[0, len] != script_name) then
        raise 'mismatch script_name.'
      end
      return script_name, @path[len..-1]
    end