title: Nginx reserve-proxy https and http connect error
body: <p>First of all, I have an nginx reserve-proxy for my development server. My development server has backend and frontend with docker containers. I use nginx, letsencrypt for https. When I go to my website ,
  frontend go out with https and frontend(https) cannot connect to backend api(http). I'm nood in programming but please help me to find out more</p>