原來HTTP還能這樣跑

有關Persistent Connections部份的資料

HTTP 連線管理
http://ihower.idv.tw/blog/archives/1517

Managing TCP Connections under Persistent HTTP
http://www8.org/w8-papers/5c-protocols/policies/policies.html

part of Hypertext Transfer Protocol -- HTTP/1.1
RFC 2616 Fielding, et al.
8 Connections
http://www.w3.org/Protocols/rfc2616/rfc2616-sec8.html