http长链接与短链接

http://www.cnblogs.com/cswuyg/p/3653263.html

keep-live模式 这个博客写的很全：http://www.cnblogs.com/skynet/archive/2010/12/11/1903347.html

 

http://blog.csdn.net/mengyafei43/article/details/25195445

http://www.codeceo.com/article/http-long-connect.html