一个简单的http客户端和简单的http服务器，命令行输出和接收参数，并将返回内容存到本地。client可以实现向主机的get请求；服务器可以响应get、put请求-A simple http client and a simple http server command line output and receiver parameters and returns the content stored locally. client can request to get the host　the server can respond to get, put request