fix to use https proxy agent, when https_proxy env variable is set.

[gstroup]

[binario200]

I have dealing with proxy issues at my job. I found a similar solution. Where this will be merge?

[mookkiah]

As many corporate infrastructure has http proxy in place, it is good idea to honor these environment variables NO_PROXY, HTTPS_PROXY, HTTP_PROXY, http_proxy, https_proxy, no_proxy

Is the merge conflict a reason for not getting this PR merged? If yes, I am happy to help resolving and considering all the above variables covered.