django static files not found in production code example

Example 1: django static files / templates

from django.conf import settings
from django.conf.urls.static import static

urlpatterns = [
    # ... the rest of your URLconf goes here ...
] + static(settings.STATIC_URL, document_root=settings.STATIC_ROOT)

Example 2: django static files

{% load static %}
<img src="{% static "my_app/example.jpg" %}" alt="My image">

Example 3: django static files

STATIC_URL = '/static/'