真实地址:http://192.168.152.138:8080/testhb/hello.html
2.现在不想把192.168.152.138:8080 暴露在外面,在192.168.152.2 机器上代理此请求 http://192.168.152.138:8080/testhb/hello.html
3.目的:代理地址 http://192.168.152.2:80/api/testhb/hello.html 被代理地址(真实地址):http://192.168.152.138:8080/testhb/hello.html
设置A=192.168.152.2:80 ; B=192.168.152.138:8080