Comment 5 for bug 2032783

You seemed to have an issue with the terraform provider, which makes its own calls to the charmhub api, and therefore will not use juju model's proxy configuration.

You may try setting the environment variables:
export HTTP_PROXY=...
export HTTPS_PROXY=...

We get a copy of the environment variables (that we update), every time we issue a terraform command.

A more robust solution will be provided in the next few months, proxy settings are on the roadmap.