code: def copy(self):
          ''' Returns a copy of self. '''
          # TODO
          copy = Response()
          copy.status = self.status
          copy._headers = dict((k, v[:]) for (k, v) in self._headers.items())
          return copf copy(self):
          ''' Returns a copy of self. '''
          # TODO
          copy = Response()
          copy.status = self.status
          copy._headers = dict((k, v[:]) for (k, v) in self._headers.items())
          return copy
docs: Returns a copy of self.