title: Nginx - Allowing origin IP
body: <p>Nginx supports <code>allow</code> and <code>deny</code> syntax to restrict IPs, e.g. <code>allow 192.168.1.1;</code>. But if traffic goes through a reverse proxy, the IP will refer to the proxy's IP. So how can it be configured to whitelist a specific origin IP and deny all other incoming requests?</p>