实现一个简单的http收发协议，完成post和get两个功能，post用于向服务器指定文件末尾添加字符，get用于从服务器取回指定文件-Achieve a the simple http transceiver agreement, the completion of the post and get two functions, post used to add character to the end of the specified file to the server, get used to retrieve the specified file from the server