env GO111MODULE=on

# GOPROXY file paths must provide the "file://" prefix explicitly.
env GOPROXY=$WORK/proxydir
! go list -versions -m golang.org/x/text
stderr 'invalid proxy URL.*proxydir'

[!net:proxy.golang.org] stop

# GOPROXY HTTPS paths may elide the "https://" prefix.
# (See golang.org/issue/32191.)
env GOPROXY=proxy.golang.org
env GOSUMDB=
go list -versions -m golang.org/x/text

-- go.mod --
module example.com
go 1.13
-- $WORK/proxydir/README.md --
This proxy contains no data.