"manage.py runserver" does not respect SCRIPT_NAME header

[Oleg Kainov]

0. Configure local nginx to emulate prod-like environment (i.e. when Django is running in Docker) and app should be in subfolder

 location /myapp/ {
                proxy_pass http://127.0.0.1:8000/;

   #proxy_set_header X-Script-Name /myapp;
    proxy_set_header SCRIPT_NAME /myapp;

                include proxy_params;
}

1. Run default Django app locally

   manage.py runserver
   

2. Debug any request and inspect request.META
3. Make sure request.METASCRIPT_NAME is empty

In the same time seems that running with uWSGI or something similar works. SO I assume the error is somewhere in manage.py runserver behavior

Background:
While I'm aware that runserver considered "insecure" and "slow", it doesn't really matter for me when I'm deploying small internal apps in my company (imagine ~10 users-app with <5 views). Since with manage.py I can run my app in "one click" and avoid hassle of separating static files serving and the main app, I would really like to keep it this way.