Solution to Django Invalid HTTP HOST header Error

If you are getting an error when publishing your Django project using a domain name, the reason is that the proxy HOST information in the HTTP service is incorrect. In other words, if there is a service such as unicorn, NGINx or Apache sends the HOST information incorrectly when redirecting to the unicorn via proxy.

proxy_set_header Host '$http_host';
If additional characters are added to the '$http_host' section, this URL like \\ is sent to uvicorn and the URL rules cannot be matched.

NGINX sample code:

location / {
proxy_set_header Host '$http_host';
proxy_set_header X-Forwarded-For '$proxy_add_x_forwarded_for';
proxy_set_header X-Forwarded-Proto '$http_x_forwarded_proto';
proxy_redirect off;
proxy_pass http://notifytube_django3;
proxy_connect_timeout 500;
proxy_read_timeout 600;
}

NOTE: Finally, do not forget to restart the NGINX service.