Django: CloudFront wasn't able to connect to the origin - django

Question

I'm working on a Django project and it's dockerized, I've deployed my application at the Amazon EC2 instance, so currently, the EC2 protocol is HTTP and I want to make it HTTPS so I've created a cloud front distribution to redirect at my EC2 instance but unfortunately I'm getting the following error.
error:
CloudFront attempted to establish a connection with the origin, but either the attempt failed or the origin closed the connection. We can't connect to the server for this app or website at this time. There might be too much traffic or a configuration error. Try again later, or contact the app or website owner.
If you provide content to customers through CloudFront, you can find steps to troubleshoot and help prevent this error by reviewing the CloudFront documentation.
Generated by cloudfront (CloudFront)
Request ID: Pa0WApol6lU6Ja5uBuqKVPVTJFBpkcnJQgtXMYzQP6SPBhV4CtMOVw==
docker-compose.yml
version: "3.8"
services:
db:
container_name: db
image: "postgres"
restart: always
volumes:
- ./scripts/init.sql:/docker-entrypoint-initdb.d/init.sql
- postgres-data:/var/lib/postgresql/data/
env_file:
- prod.env
app:
container_name: app
build:
context: .
restart: always
volumes:
- static-data:/vol/web
depends_on:
- db
env_file:
- prod.env
proxy:
container_name: proxy
build:
context: ./proxy
restart: always
depends_on:
- app
ports:
- 80:8000
volumes:
- static-data:/vol/static
volumes:
postgres-data:
static-data:
Dockerfile
FROM python:3
ENV PYTHONDONTWRITEBYTECODE=1
ENV PYTHONUNBUFFERED=1
WORKDIR /app
EXPOSE 8000
COPY ./core/ /app/
COPY ./scripts /scripts
# installing nano and cron service
RUN apt-get update
RUN apt-get install -y cron
RUN apt-get install nano
RUN pip install --upgrade pip
COPY requirements.txt /app/
# install dependencies and manage assets
RUN pip install -r requirements.txt && \
mkdir -p /vol/web/static && \
mkdir -p /vol/web/media
# files for cron logs
RUN mkdir /cron
RUN touch /cron/django_cron.log
# start cron service
RUN service cron start
RUN service cron restart
RUN chmod +x /scripts/run.sh
CMD ["/scripts/run.sh"]