def setup_environ(self):
        """https://www.python.org/dev/peps/pep-0333/#environ-variables"""
        # Set up base environment
        env = self.base_environ = {}
        env['SERVER_NAME'] = self.server_name
        env['GATEWAY_INTERFACE'] = 'CGI/1.1'
        env['SERVER_PORT'] = str(self.server_port)
        env['REMOTE_HOST'] = ''
        env['CONTENT_LENGTH'] = ''
        env['SCRIPT_NAME'] = ''
https://www.python.org/dev/peps/pep-0333/#environ-variables