To support HTTPS you need SSL certificates, if you already have then customize the path for SSL certificates in dockerfile otherwise run ssl.sh file before running dockerfile.

cd Dockerfile-Apache-Reverse-Proxy
chmod +x ssl.sh  
./ssl.sh

Open dockerfile and replace www.example.com with the address of your backend server. To build dockerfile

docker build -t "reverseproxy:apache" .

After successful build run proxy container

 docker run -it -p 80:80 -p 443:443 reverseproxy:apache /bin/sh