对简单的TFPT协议进行改进，使其适应较大文件的传输，并且基于可靠的TCP连接，但比FTP又简单得多，适合中型传输和嵌入到应用系统中进行文件传输-TFPT agreement on simple improvements to adapt to a larger file transfers, and on a reliable TCP connection, but also much simpler than FTP, suitable for medium-sized applicatio