Nginx:alpine image is running in docker container and it is using for 8081 port. Why is it showing localhost didn’t send any data error message?

General Discussions
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All Nginx configuration files are stored under /etc/nginx.

I use this Dockerfile for “static” images such as our proxies:

FROM nginx:latest

ARG working_env

ADD nginx.conf /etc/nginx/nginx.conf
ADD $working_env/conf.d /etc/nginx/conf.d

# Testing all configuration files
RUN nginx -t -c /etc/nginx/nginx.conf

EXPOSE 80 443
CMD ["nginx", "-c", "/etc/nginx/nginx.conf", "-g", "daemon off;"]

And then I use the -p :80 when I start the container.

To do the same with docker-compose I use the something like this:

version: "3.7"

services:
  nginx:
    image: nginx-proxy
    ports:
    - "8081:80"
    volumes:
      - type: bind
        source: ./nginx/nginx.conf
        target: /etc/nginx/nginx.conf
    deploy:
      replicas: 1
      update_config:
        parallelism: 1
        delay: 10s
        max_failure_ratio: 0.1
        order: start-first
      restart_policy:
        condition: on-failure
      placement:
        constraints: [node.role == worker]

This will mount the config from the directory where my docker-compose.yml file is and into the running container. Perfect for testing different configurations.