"""
WSGI config for epcstages project.

This module contains the WSGI application used by Django's development server
and any production WSGI deployments. It should expose a module-level variable
named ``application``. Django's ``runserver`` and ``runfcgi`` commands discover
this application via the ``WSGI_APPLICATION`` setting.

Usually you will have the standard Django WSGI application here, but it also
might make sense to replace the whole Django WSGI application with a custom one
that later delegates to the Django one. For example, you could introduce WSGI
middleware here, or combine a Django application with an application of another
framework.

"""
import os

os.environ.setdefault("DJANGO_SETTINGS_MODULE", "common.settings")

# This application object is used by any WSGI server configured to use this
# file. This includes Django's development server, if the WSGI_APPLICATION
# setting points here.
from django.core.wsgi import get_wsgi_application
application = get_wsgi_application()

# Apply WSGI middleware here.
# from helloworld.wsgi import HelloWorldApplication
# application = HelloWorldApplication(application)

"""
WSGI config for epcstages project.

"""
import os

UPGRADING = False


def upgrade_in_progress(environ, start_response):
    response_headers = [('Content-type','text/html')]
    response = """
        <body>
        <h1>This site is in maintenance mode, please come back in some minutes.</h1>
        <h1>Ce site est actuellement en maintenance, merci de revenir dans quelques minutes.</h1>
        </body>
    """
    if environ['REQUEST_METHOD'] == 'GET':
        status = '200 OK'
    else:
        status = '403 Forbidden'
    start_response(status, response_headers)
    return [response]

if UPGRADING:
    application = upgrade_in_progress
else:
    os.environ.setdefault("DJANGO_SETTINGS_MODULE", "common.settings")

    # This application object is used by any WSGI server configured to use this
    # file. This includes Django's development server, if the WSGI_APPLICATION
    # setting points here.
    from django.core.wsgi import get_wsgi_application
    application = get_wsgi_application()

Add maintenance mode in wsgi file