Mender client HTTP proxy support

@jem2e4 Glad it worked out for you :slight_smile:

Also, I guess the variable could be added to the environment through using the overlay-fs functionality present there with the --overlay :wink:

If using Hosted Mender, will both the connections to hosted.mender.io and to AWS S3 for Artifact storage be proxied through HTTPS_PROXY?

I would assume it to be so.