def _parse_response(self,msg):
        '''解析响应消息'''
        header,body = msg.split(HEADER_END_STR)[:2]
        header_lines = header.splitlines()
        version,status = header_lines[0].split(None,2)[:2]
        headers = self._parse_header_params(header_lines[1:])
        return int(status),headers,body
解析响应消息