<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _handle_response(self, response):
 """ Handle the HTTP response by memoing the headers and then delivering bytes. """

        self.client.status = response.code
        self.response_headers = response.headers
        # XXX This workaround (which needs to be improved at that) for possible
        # bug in Twisted with new client:
        # http://twistedmatrix.com/trac/ticket/5476
        if self._method.upper() == 'HEAD' or response.code == NO_CONTENT:
            return succeed('')
        receiver = self.receiver_factory()
        receiver.finished = d = Deferred()
        receiver.content_length = response.length
        response.deliverBody(receiver)
        if response.code >= 400:
            d.addCallback(self._fail_response, response)
        return d