<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def freeze(self, no_etag=False):
 """Call this method if you want to make your response object ready for pickeling. This buffers the generator if there is one. This also sets the etag unless `no_etag` is set to `True`. """

        if not no_etag:
            self.add_etag()
        super(ETagResponseMixin, self).freeze()