This project is no longer supported. See below for an alternative using Caddy.

Alternative

To create a proxy to an HTTP app for HTTPS for local development, use Caddy.

Setting Up Caddy

Install Caddy according to the instructions on caddyserver.com
Run sudo caddy trust to install a local certificate authority. This will allow Caddy to create a self-signed certificate.
For your project, create a caddyfile as below, replacing the :80 with the port your server is running on (often :3000 or :8000)

{
  http_port 8090
}
https://localhost {
    tls internal

    reverse_proxy localhost:80
}

To start the proxy, run caddy run in the directory where the caddyfile lives. You can also adjust hostnames by changing https://localhost at the top to whatever hostname you'd like.

Caddy likes to run its own non-secured HTTP server at port 80. The http_port command above pushes that non-secured server to another port.