Error related to connecting Django from Docker to Nginx

I am currently working on Docker and have done the following:

1. The Django test page was working fine on localhost.
2. I connected it to Docker.
3. I also connected Docker to Gunicorn. However, when I try to connect it through Nginx, only the default Nginx page is displayed, and it is not connecting to the application I created.

nginx/Dockerfile

FROM nginx:latest
RUN rm /etc/nginx/conf.d/default.conf
COPY nginx.conf /etc/nginx/conf.d

---

# nginx/nginx.conf

    upstream daniel_blog {
    server web:8000;
}

server {
    listen 80;

    server_name localhost;

    # Default location
    location / {
        proxy_pass http://daniel_blog;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header Host $host;
        proxy_redirect off;
    }

    # Static files
    location /static/ {
        alias /usr/src/app/_static/;
    }

    # Media files
    location /media/ {
        alias /usr/src/app/_media/;
    }
}

---
# .env.dev

DEBUG="1"
SECRET_KEY="django-insecure-88ndzs0z0uzko4x5f=*ngu=#h+a(k=!#ooyvt*0h+78r1n=^oy"
DJANGO_ALLOWED_HOSTS = localhost 127.0.0.1 [::1]
SQL_ENGINE=django.db.backends.postgresql
SQL_DATABASE=daniel_blog_dev
SQL_USER=daniel_blog_user
SQL_PASSWORD=daniel_blog_db_password
SQL_HOST=db
SQL_PORT=5432

---
# .env.prod

DEBUG=0
SECRET_KEY=w4+=--yyyigm1-=na@9et*1ldt-q-x4x=57m2xkiru6!oxeh5b
DJANGO_ALLOWED_HOSTS=localhost 127.0.0.1 [::1]
SQL_ENGINE=django.db.backends.postgresql
SQL_DATABASE=daniel_blog_prod
SQL_USER=daniel_blog_user
SQL_PASSWORD=daniel_blog_db_password
SQL_HOST=db
SQL_PORT=5432

---

# .env.prod.db

POSTGRES_USER=daniel_blog_user
POSTGRES_PASSWORD=daniel_blog_db_password
POSTGRES_DB=daniel_blog_prod

---

# docker-compose.yml

    services:
  nginx:
    build: ./nginx
    volumes:
      - static_volumes:/usr/src/app/_static
      - media_volumes:/usr/src/app/_media
    ports:
      - 80:80
    depends_on:
      - web
  web:
    build: .
    command: gunicorn daniel_blog.wsgi:application --bind 0.0.0.0:8000
    volumes:
      - static_volumes:/usr/src/app/_static
      - media_volumes:/usr/src/app/_media
      - ./:/usr/src/app/_media
    expose:
      - 8000
    env_file:
      - ./.env.prod
    depends_on:
      - db
  db:
    image: postgres:17.0-alpine
    volumes:
      - postgres_data:/var/lib/postgresql/data/
    env_file:
      - ./.env.prod.db
volumes:
  postgres_data:
  static_volumes:
  media_volumes:


---

# Dockerfile

FROM python:3.11-slim

RUN apt-get update && apt-get install -y \
    build-essential \
    libffi-dev \
    libssl-dev \
    && rm -rf /var/lib/apt/lists/*

RUN apt-get update && apt-get install -y libpq-dev gcc

WORKDIR /usr/src/app

COPY requirements.txt ./
RUN pip install --no-cache-dir -r requirements.txt
COPY requirements.txt ./

COPY . .

---

# settings.py - DATABASES

    DATABASES = {
    'default': {
        'ENGINE': os.environ.get("SQL_ENGINE", 'django.db.backends.postgresql'),
        'NAME': os.environ.get('SQL_DATABASE', 'daniel_blog_dev'),
        'USER': os.environ.get('SQL_USER', 'daniel_blog_user'),
        'PASSWORD': os.environ.get('SQL_PASSWORD', 'daniel_blog_db_password'),  # 환경 변수에서 비밀번호 가져오기
        'HOST': os.environ.get('SQL_HOST', 'localhost'),  # db 컨테이너의 서비스 이름 사용
        'PORT': os.environ.get('SQL_PORT', '5432'),  # 기본 포트 5432
        "OPTIONS": {
            "client_encoding": "UTF8"
        }
    }
}

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