Run over HTTPS

[nkprasad12]

See https://blog.miguelgrinberg.com/post/running-your-flask-application-over-https

[nkprasad12]

Note: this will be pretty hard to do while we're on Heroku free tier, as Automated Certificate Management is not available fore free apps (https://devcenter.heroku.com/articles/automated-certificate-management). This means that we would need to manually refresh the certs every few months.