官方文档

官网实例参考：
http://hc.apache.org/httpcomponents-client-4.5.x/
http://hc.apache.org/httpcomponents-client-4.5.x/examples.html

Https验证相关：
https://docs.oracle.com/javase/8/docs/technotes/guides/security/jsse/JSSERefGuide.html