Nginx reverse proxy - deny access to specific backend IP addresses

问题

I'm running Nginx reverse proxy using proxy_pass directive from ngx_http_proxy_module. Is there a way to forbid access to certain backend IP address ranges? I've tried this but that doesn't seem to work.

来源：https://stackoverflow.com/questions/60223175/nginx-reverse-proxy-deny-access-to-specific-backend-ip-addresses