HTTP 2.0要来了，你竟然还不知道什么是SPDY？
云计算时代，浏览器和移动APP成为云端资源的主要入口。 HTTP 1.1已经成为这个生态环境的瓶颈。 SPDY协议是Google开发的一种基于TCP的应用层协议，旨在替换当前的HTTP 1.1。 据说SPDY协议的性能比HTTP 1.1快1倍。 SPDY保留了HTTP 1.1的语义，但是在传输方式上
云计算时代，浏览器和移动APP成为云端资源的主要入口。
HTTP 1.1已经成为这个生态环境的瓶颈。
SPDY协议是Google开发的一种基于TCP的应用层协议，旨在替换当前的HTTP 1.1。
据说SPDY协议的性能比HTTP 1.1快1倍。
SPDY保留了HTTP 1.1的语义，但是在传输方式上与HTTP 1.1截然不同。就是说，现有的Web应用基本无需任何修改就可以从HTTP 1.1迁移到SPDY协议。
SPDY协议和HTTP 1.1一样都是基于TCP，但是它与HTTP 1.1的区别在于，HTTP 1.1与TCP是紧耦合的，HTTP 1.1的Message是直接通过TCP的packet发送的；而SPDY协议则在TCP之上定义了一个framing layer，也可以称之为HTTP Layer。
framing layer的连接叫做stream，区别于TCP的connection。每个connection对应多个stream。每个stream对应的是一个请求/响应。多个stream可以并行的进行发送/接受数据。
HTTP 2.0据说将在今年正式Release，SPDY协议可以说是HTTP 2.0标准的一个参考。
想知道SPDY协议具体解决了HTTP 1.1的哪些问题？请参考 http://www.slideshare.net/ihower/a-brief-introduction-to-spdy-http20
另外，如果你想了解SPDY协议的实现细节，请参考 http://www.chromium.org/spdy/spdy-protocol/spdy-protocol-draft3-1
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