[Django] css in the project cannot be read

Event

I accessed the Django management site in my local development environment, The css (static file) could not be read on the management site as shown below.

django_admin_no_css_login.png django_admin_no_css.png


Prerequisites

Python 3.7.4
Django 2.2.6
virtualenv 16.1.0

analysis

HTTP log

$ python manage.py runserver
Performing system checks...

System check identified no issues (0 silenced).
November 02, 2019 - 16:45:33
Django version 2.2.6, using settings 'studysite.settings'
Starting development server at http://127.0.0.1:8000/
Quit the server with CONTROL-C.
[02/Nov/2019 16:24:55] "GET /admin/ HTTP/1.1" 200 3080
[02/Nov/2019 16:24:55] "GET /static/admin/css/responsive.css HTTP/1.1" 404 77
[02/Nov/2019 16:24:55] "GET /static/admin/css/dashboard.css HTTP/1.1" 404 77
[02/Nov/2019 16:24:55] "GET /static/admin/css/base.css HTTP/1.1" 404 77

Apparently css can't be read. I checked settings.py to find out the cause.

settings.py


# snip

DEBUG = False
ALLOWED_HOSTS = ['localhost','0.0.0.0']

# snip

The above DEBUG = False was suspicious, so if you set it to True, css can be read. DEBUG = False is supposed to be a production environment, and it seems that static files are read from a web server such as nginx.

counter-measure

In order for css to be loaded, it is necessary to support ** either ** of the following two.

1. Set DEBUG = True in settings.py

If set to True, css in the project will also be loaded.

2. Use the python manage.py runserver --insecure command

With the --insecure option, the css in your project will be loaded.

bonus

settings.py


DEBUG = False
ALLOWED_HOSTS = ['*']

Css was not applied with this setting. It seems that css cannot be read just by setting ALLOWED_HOSTS arbitrarily.

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