Set the Content-Type in the response. Uses the :attr:`type`
        instance attribute which was set by :func:`get_content_type`. Also
        declares a UTF-8 charset.

def set_response_content_type(self):
        """Set the Content-Type in the response. Uses the :attr:`type`
        instance attribute which was set by :func:`get_content_type`. Also
        declares a UTF-8 charset.
        """
        if self.response.body:
            ct = self.type
            if self.charset:
                ct += '; charset=' + self.charset
            self.response.headers['Content-Type'] = ct
        elif 'Content-Type' in self.response.headers:
            del self.response.headers['Content-Type']