ADD CORS to the header

[mikekaranja]

Hi I cannot be able to send a cross-domain request from my website to the project-mulla heroku app, do you happen to know how allow this on heroku? I keep getting the error No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:5000' is therefore not allowed access. The response had HTTP status code 503.