Unable to Reverse Proxy from Frontend Pod to Backend Pod on same server cluster

Hello everyone. I have a K8s cluster with a frontend pod on one server and a backend pod on another server. They are in the same namespace, and both use the NodePort service type. In the frontend pod’s nginx configuration, we have defined the proxy pass to the backend URL and port (reverse proxy).
However, it still is not able to reach properly.

May anyone help share some of their ideas or expertise of why this could be ?

Have you tried send http request from frontend pod to the backend url?

Hello, I have tried the curl command but it doesn’t work.