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    def prepare(self):
        """
        watch out _prepare* functions' sequence 
        NOTE: WITHOUT JUDGING self._finished THERE WILL BE BIG PROBLEMS
        """
        self._prepare_debug()
        if self._finished: return

        self._prepare_mobile()
        if self._finished: return

        self._prepare_auth()
        if self._finished: return

        self._prepare_params()
        if self._finished: return

        self._prepare_web()
        if self._finished: return

        self._prepare_others()
        if self._finished: return