As seen in this issue, you can use git ls-remote to test your address.
If you need to debug the git calls
set GIT_TRACE=1. eg:
env GIT_PROXY_COMMAND=myproxy.sh GIT_TRACE=1 git ls-remote https://...
“
git ls-remote” is the quickest way I know to test communications with a
remote repository without actually cloning it. Hence its utility as a test for this
issue.
You can see it used for detecting an address issue in “git ls-remote returns 128 on any repo”.