Migrating reverse proxy settings from Nginx to Apache2

Question

until now I have been using Nginx but due to some reasons I have to switch to Apache2. I am not a sys admin so if more info is needed, just ask

I am unable to migrate 1 simple proxy settings to Apache2:

location /auth {
  proxy_pass http://localhost;
  proxy_set_header Host $host;
  proxy_set_header X-Real-IP $remote_addr;
  proxy_set_header X-Forwarded-Proto https;
  proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
}

Especially how to migrate header X-Forwarded-For, because I do not know what could be the equivalent in Apache2