How to proxy multiple sites in NGINX upstream?

Question

Nginx

That is, it comes to location and is divided by servername/domain, and refers to the proxy by IP address. Is it correct that you can further divide only by different ports (8001, 8002), if there is only one proxy server? Is it possible to use servername/domain somehow on a proxy if it is a private server with only an IP address?

Answer 1

It is not necessary to further divide by ports.
It is enough just to set the HOST header at the time of proxying
And then resolve on the destination server by server_name

Answer 2

yes it is possible.
After all, the web server parses the http_referer headers