support HTTPS_PROXY to connect via other proxy
support HTTPS_PROXY to connect via other proxy

elazarl/goproxy,stoplightio/goproxy,toorop/goproxy,kofj/goproxy,v2e4lisp/goproxy,abourget/goproxy,taliesins/goproxy,brainm/goproxy,markdalgleish/goproxy,elazarl/goproxy2,coderhaoxin/goproxy,taliesins/goproxy,akshay-bhardwaj/progo,rdbell/goproxy,pathletboy/goproxy,markdalgleish/goproxy,dushmis/goproxy,shuyaoyimei/goproxy,stoplightio/goproxy,SoreGums/goproxy,phelian/goproxy,SoreGums/goproxy,renzuinc/goproxy,junlapong/goproxy,rdbell/goproxy,junlapong/goproxy,renzuinc/goproxy,pathletboy/goproxy,akshay-bhardwaj/progo,elazarl/goproxy2,stoplightio/goproxy,v2e4lisp/goproxy,selslack/goproxy,KevinMGranger/goproxy,renzuinc/goproxy,pmezard/goproxy,phelian/goproxy,toorop/goproxy,dushmis/goproxy,rranshous/goproxy,naokibtn/goproxy,markdalgleish/goproxy,v2e4lisp/goproxy,selslack/goproxy,coderhaoxin/goproxy,pmezard/goproxy,naokibtn/goproxy,elazarl/goproxy2,KevinMGranger/goproxy,mzimmerman/goproxy,rranshous/goproxy,rranshous/goproxy,shuyaoyimei/goproxy,dushmis/goproxy,KevinMGranger/goproxy,phelian/goproxy,junlapong/goproxy,kofj/goproxy,abourget/goproxy,pathletboy/goproxy,brainm/goproxy,selslack/goproxy,SoreGums/goproxy,shuyaoyimei/goproxy,brainm/goproxy,elazarl/goproxy,mzimmerman/goproxy,rdbell/goproxy,renzuinc/goproxy,taliesins/goproxy,kofj/goproxy,toorop/goproxy,coderhaoxin/goproxy,naokibtn/goproxy,elazarl/goproxy,abourget/goproxy,pmezard/goproxy