Another simple solution would be to write a custom MIDDLEWARE which will give the response to ELB before the ALLOWED_HOSTS is checked. So now you don't have to load ALLOWED_HOSTS dynamically.

The middleware can be as simple as:

project/app/middleware.py

from django.http import HttpResponse
from django.utils.deprecation import MiddlewareMixin

class HealthCheckMiddleware(MiddlewareMixin):
def process_request(self, request):
if request.META["PATH_INFO"] == "/ping/":
return HttpResponse("pong")

settings.py

MIDDLEWARE = [
'corsheaders.middleware.CorsMiddleware',
'app.middleware.HealthCheckMiddleware',
'django.middleware.security.SecurityMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.common.CommonMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
...
]

Django Middleware reference https://docs.djangoproject.com/en/dev/topics/http/middleware/

https://docs.aws.amazon.com/autoscaling/ec2/userguide/as-scaling-target-tracking.html
https://docs.aws.amazon.com/autoscaling/ec2/userguide/as-instance-monitoring.html#enable-as-instance-metrics
https://www.terraform.io/docs/providers/aws/r/appautoscaling_policy.html
https://docs.aws.amazon.com/AmazonECS/latest/developerguide/service-auto-scaling.html

For UDP traffic, the load balancer selects a target using a flow hash algorithm based on the protocol, source IP address, source port, destination IP address, and destination port. A UDP flow has the same source and destination, so it is consistently routed to a single target throughout its lifetime. Different UDP flows have different source IP addresses and ports, so they can be routed to different targets.

people are crazy