OPTIONS http methods gives an empty response on Heroku

Question

When I do things locally my CORS calls are working fine

$ curl -i -X OPTIONS \"http://localhost:3000/api/v1/login\"
HTTP/1.1 200 OK
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Answer 1

I filed a ticket for this, as it turned out, things were not easy to troubleshoot, but the answer is very simple: make your calls using https instead of http