@abstract_method<EOL><INDENT>def _prepare_response(self, response):<EOL><DEDENT>
raise NotImplementedError(<EOL>'<STR_LIT>'.format(cls=type(self).__name__),<EOL>)<EOL>
Modifies the response from the node.

If this method returns a dict, it will replace the response
entirely.

:param response:
  Guaranteed to be a dict, but it might be empty.