我们说因为有了IP协议，因特网才得以迅速发展成为世界上最大的、开放的计算机通信网络。IP协议就是为计算机网络相互连接进行通信而设计的协议，在因特网中，它是能使连接到网上的所有计算机网络实现相互通信的一套规则，规定了计算机在因特网上进行通信时应当遵守的规则。
第一篇文章“TCP协议在wireshark下的详细格式介绍”内图片上传后，大量网友回复模糊，特此更正下图片：TCP第二张：---不华丽的分隔符---今日分享：细看wireshark下IP报文赶紧收藏转发吧！请关注本头条号，频率更新好文~没事时候记得拿出来看哈！
看来wget之前也存在此类问题，于是继续搜索标准，输出如下:The presence of a message body in a response depends on both the request method to which it is responding and the response status code . Responses to the HEAD request method never include a message body because the associated response header fields ， if present， indicate only what their values would have been if the request method had been GET . 2xx responses to a CONNECT request method switch to tunnel mode instead of having a message body. All 1xx ， 204 ， and 304 responses do not include a message body. All other responses do include a message body， although the body might be of zero length.
