Forwarding Client's IP Address when Using an HTTP Reverse Proxy.

I use an HTTP Proxy to host two domains on a single server. I lost visibility to the client’s IP address when I did this. In my proxy.js code, I enable forwarding, i.e., const proxy = httpProxy.createProxyServer({fwd: true }); and in my server, I instruct it to trust the proxy (i.e., app.set(‘trust proxy,’ true); ). I have middleware to retrieve the client IP address: req.clientIp = req.headers[“x-forwarded-for”] || req.socket.remoteAddress.

However, I can only get access to my service provider’s edge IP address. How can I ensure that the client’s IP address is being forwarded?