How to replace subdomain in http header in nginx?

Question

Django

You need to replace the proxied header for gunicor that nginx passes to it. Let's say I request the name dev.example.com and gunicorn is given just example.com. I just managed to remove the subdomain as follows:

location / {
                        proxy_pass http://unix:/var/run/gunicorn/gunicorn.sock;
                        proxy_redirect off;
                        proxy_set_header X-Real-IP $remote_addr;
                        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
                        proxy_set_header X-Forwarded-Proto $scheme;
                        proxy_set_header Host example.com;
                }

However, I need the subdomains to be passed as well, for example hello.dev.example.com is given to gunicorn as hello.example.com. Please tell me how to do it.

Answer 1

Try like this:

server{
  ...
  server_name ~^(?<pre_host>.+)\.dev\.example\.com$;
}

location / {
  ...
  proxy_set_header Host $pre_host.example.com;
}

Finalochka: