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
X-Powered-By: Express
Acc         


        

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

Answer 2

Getting no response might be caused by configuration similar to this:

if ($request_method !~ ^(GET|HEAD|POST|PUT|DELETE)$ ) {
    return 444;
}

Which means that nginx will close the connection without a proper response, that's why this is so difficult to debug.

Search your configuration for the 444 return code. If you find something like the above, just add OPTIONS to the list).