tlv: 一种通用的socket网络协议数据格式。特点：扩展兼容性好，解析快，结构性好，数据包小。配套使用代码。淘宝等公司都使用这个。-tlv: a universal socket network protocol data format. Features: Extended compatibility is good, fast parsing, structural, and small packets. Taobao and other companies are using.