Ionic user authentication with http https

Hi,

I built a simple user authentication program based on https://devdactic.com/restful-api-user-authentication-1/

which works fine on http but has trouble with https.

For some weird reason, it works once after I connect to my site using emulator's or device's internet browser using https.

For my server setup I have nginx handling the https stuff and connecting to local nodejs.

Any ideas?

H. Kim