主题：是否可以考虑放弃浏览器另起炉灶 -- 益者三友

标题是替换HTTP，是替换应用层协议，不是通信层。

看他的第一个版本的实现：

Connections

The first implementation of the SPDY session runs atop TCP, similarly to how HTTP works today. The client is expected to be the TCP connection initiator. Because it runs on TCP, we have a reliable transport. Unlike HTTP, all connections with SPDY are persistent connections. The HTTP connection header does not apply.

For best performance, it is expected that clients will not close open connections until the user navigates away from all web pages referencing a connection, or until the server closes the connection. Servers are encouraged to leave connections open for as long as possible, but can terminate idle connections after some amount of inactivity if necessary.

他是建立在TCP之上的