修复了一些bugs和增加了新特性
Commons-httpclient项目就是专门设计来简化HTTP客户端与服务器进行各种通讯编程。
通过它可以让原来很头疼的事情现在轻松的解决，例如你不再管是HTTP或者HTTPS的通讯
方式，告诉它你想使用HTTPS方式，剩下的事情交给httpclient替你完成。
新特性包括：
Architecture
New preference architecture
Improved exception handling framework
Granular non-standards configuration and tracking
Improved HTTP Version configuration and tracking
Support for streaming entities
Support for tunneled HTTP proxies via the ProxyClient
Ability to abort execution of HTTP methods
Connection management
Support for closing idle connections
Support for JDK1.4 connect timeout through reflection
Support for connection manager shutdown
Authentication
Improved authentication framework
Plug-in mechanism for authentication modules
Interactive authentication support
Alternate authentication support
Cookie management
Cookie specification plug-in mechanism
'Ignore cookies' cookie policy
Improved Netscape cookie support
Redirects
Cross-site redirect support
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