Using an http proxy heroku

heroku
nodejs

#1

Hi, I m having struggled with heroku login by using C9 IDE. after I trying to login and it said error Post https://api.heroku.com/login: http: error connecting to proxy https://proxy.server.com:portnumber: dial tcp: unknown port tcp/portnumber

also, I have tried this

export HTTP_PROXY=http://proxy.server.com:portnumber
or
export HTTPS_PROXY=https://proxy.server.com:portnumber
heroku login

I do not know how to find my proxy ip address and portnumber.

How would you do on the terminal?

Please help me thank you very much