Add first version of the project

.env.sample

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+DEBUG=False
+SECRET_KEY=phaxiz3uqu4eiD4gaipoSh3Ao2Aim9jie6aS2liec1yi0ogi
+ALLOWED_HOSTS=*,

manage.py

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+#!/usr/bin/env python
+import os
+import sys
+
+if __name__ == '__main__':
+    os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'ungleich_no_ipv4_here.settings')
+    try:
+        from django.core.management import execute_from_command_line
+    except ImportError as exc:
+        raise ImportError(
+            "Couldn't import Django. Are you sure it's installed and "
+            "available on your PYTHONPATH environment variable? Did you "
+            "forget to activate a virtual environment?"
+        ) from exc
+    execute_from_command_line(sys.argv)

no_ipv4_here/admin.py

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+from django.contrib import admin
+
+# Register your models here.

no_ipv4_here/apps.py

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+from django.apps import AppConfig
+
+
+class NoIpv4HereConfig(AppConfig):
+    name = 'no_ipv4_here'

no_ipv4_here/models.py

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+from django.db import models
+
+# Create your models here.

no_ipv4_here/tests.py

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+from django.test import TestCase
+
+# Create your tests here.

no_ipv4_here/views.py

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+from django.contrib.sites.shortcuts import get_current_site
+from django.http import HttpResponse
+
+
+# Create your views here.
+
+def index(request):
+    return HttpResponse(
+        """Sorry, (this part of) domain {domain} is not reachable by IPv4.
+        Please upgrade to IPv6 and try to reach {domain} again.""".format(
+            domain=get_current_site(request).domain
+        )
+    )

ungleich_no_ipv4_here/settings.py

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+"""
+Django settings for ungleich_no_ipv4_here project.
+
+Generated by 'django-admin startproject' using Django 2.1.5.
+
+For more information on this file, see
+https://docs.djangoproject.com/en/2.1/topics/settings/
+
+For the full list of settings and their values, see
+https://docs.djangoproject.com/en/2.1/ref/settings/
+"""
+
+import os
+
+import environ
+
+env = environ.Env(
+    # set casting, default value
+    DEBUG=(bool, False)
+)
+
+# Build paths inside the project like this: os.path.join(BASE_DIR, ...)
+BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+
+# reading .env file
+environ.Env.read_env(os.path.join(BASE_DIR, ".env"))
+
+# Quick-start development settings - unsuitable for production
+# See https://docs.djangoproject.com/en/2.1/howto/deployment/checklist/
+
+# SECURITY WARNING: don't run with debug turned on in production!
+DEBUG = env('DEBUG')
+
+# SECURITY WARNING: keep the secret key used in production secret!
+SECRET_KEY = env('SECRET_KEY')
+
+ALLOWED_HOSTS = env('ALLOWED_HOSTS')
+
+# Application definition
+
+INSTALLED_APPS = [
+    'django.contrib.admin',
+    'django.contrib.auth',
+    'django.contrib.contenttypes',
+    'django.contrib.sessions',
+    'django.contrib.messages',
+    'django.contrib.staticfiles',
+]
+
+MIDDLEWARE = [
+    'django.middleware.security.SecurityMiddleware',
+    'django.contrib.sessions.middleware.SessionMiddleware',
+    'django.middleware.common.CommonMiddleware',
+    'django.middleware.csrf.CsrfViewMiddleware',
+    'django.contrib.auth.middleware.AuthenticationMiddleware',
+    'django.contrib.messages.middleware.MessageMiddleware',
+    'django.middleware.clickjacking.XFrameOptionsMiddleware',
+]
+
+ROOT_URLCONF = 'ungleich_no_ipv4_here.urls'
+
+TEMPLATES = [
+    {
+        'BACKEND': 'django.template.backends.django.DjangoTemplates',
+        'DIRS': [os.path.join(BASE_DIR, 'templates')]
+        ,
+        'APP_DIRS': True,
+        'OPTIONS': {
+            'context_processors': [
+                'django.template.context_processors.debug',
+                'django.template.context_processors.request',
+                'django.contrib.auth.context_processors.auth',
+                'django.contrib.messages.context_processors.messages',
+            ],
+        },
+    },
+]
+
+WSGI_APPLICATION = 'ungleich_no_ipv4_here.wsgi.application'
+
+# Database
+# https://docs.djangoproject.com/en/2.1/ref/settings/#databases
+
+DATABASES = {
+    'default': {
+        'ENGINE': 'django.db.backends.sqlite3',
+        'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),
+    }
+}
+
+# Password validation
+# https://docs.djangoproject.com/en/2.1/ref/settings/#auth-password-validators
+
+AUTH_PASSWORD_VALIDATORS = [
+    {
+        'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
+    },
+    {
+        'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
+    },
+    {
+        'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
+    },
+    {
+        'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
+    },
+]
+
+# Internationalization
+# https://docs.djangoproject.com/en/2.1/topics/i18n/
+
+LANGUAGE_CODE = 'en-us'
+
+TIME_ZONE = 'UTC'
+
+USE_I18N = True
+
+USE_L10N = True
+
+USE_TZ = True
+
+# Static files (CSS, JavaScript, Images)
+# https://docs.djangoproject.com/en/2.1/howto/static-files/
+
+STATIC_URL = '/static/'

ungleich_no_ipv4_here/urls.py

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+"""ungleich_no_ipv4_here URL Configuration
+
+The `urlpatterns` list routes URLs to views. For more information please see:
+    https://docs.djangoproject.com/en/2.1/topics/http/urls/
+Examples:
+Function views
+    1. Add an import:  from my_app import views
+    2. Add a URL to urlpatterns:  path('', views.home, name='home')
+Class-based views
+    1. Add an import:  from other_app.views import Home
+    2. Add a URL to urlpatterns:  path('', Home.as_view(), name='home')
+Including another URLconf
+    1. Import the include() function: from django.urls import include, path
+    2. Add a URL to urlpatterns:  path('blog/', include('blog.urls'))
+"""
+from django.contrib import admin
+from django.urls import path
+
+from no_ipv4_here import views
+
+urlpatterns = [
+    path('', views.index, name='index'),
+    path('admin/', admin.site.urls),
+]

ungleich_no_ipv4_here/wsgi.py

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+"""
+WSGI config for ungleich_no_ipv4_here project.
+
+It exposes the WSGI callable as a module-level variable named ``application``.
+
+For more information on this file, see
+https://docs.djangoproject.com/en/2.1/howto/deployment/wsgi/
+"""
+
+import os
+
+from django.core.wsgi import get_wsgi_application
+
+os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'ungleich_no_ipv4_here.settings')
+
+application = get_wsgi_application()