We install an HTTP middleware that adds the "Authorization" header on
every HTTP request. However, our asset download process might redirect
to a 3rd-party host (Amazon S3) and we want to allow those requests but
not require that they are authenticated.
Furthermore, we need the ability to specify the `Accept` request header
without it being overwritten by middleware, so now middleware only adds
headers that are not present in a request.
The problem was that opts.confirmSubmit was mutated before reaching doSetup. This commit creates a copy of the initial confirmSubmit value. So the doSetup receives the initial data passed from the command, not the mutated one.
This ensures that while having git remotes to point to either
`github.com` or authenticated GHE instances, adding another git remote
pointing to an unrelated host won't change the remote resolution in any
way, even if the unrelated remote is called `upstream` or `github` (and
thus normally took precedence).
Accept the "HOST/OWNER/REPO" syntax or passing a full URL for both the
`--repo` flag and the GH_REPO environment variable and allow setting
GH_HOST environment variable to override just the hostname for
operations that assume "github.com" by default.
Examples:
$ gh repo clone example.org/owner/repo
$ GH_HOST=example.org gh repo clone repo
$ GH_HOST=example.org gh api user
$ GH_HOST=example.org gh gist create myfile.txt
$ gh issue list -R example.org/owner/repo
$ gh issue list -R https://example.org/owner/repo.git
$ GH_REPO=example.org/owner/repo gh issue list
