Added test func for proxy
Added test func for proxy

csrgxtu/gorequest,vicanso/gorequest,jqs7/gorequest,parnurzeal/gorequest,rockneurotiko/gorequest,kemadz/gorequest,QuentinPerez/gorequest,going/requests,fromkeith/gorequest,roth1002/gorequest,julianshen/gorequest