Nginx & Node inside the same Docker container

Question

I know that this is against the accepted convention but I need to run Nginx alongside a node.js server inside the same Docker container. I have no issues spinning up the container and getting Nginx and Node working alongside. Nginx works on Port 443 which is exposed by the container. The Node server listens on Port 8080 and is reverse proxied by Nginx

location /node/index.js {
 proxy_pass http://127.0.0.1:8080;
 proxy_set_header Host $host;
 proxy_set_header X-Real-IP $remote_addr;
 proxy_set_header X_Forwarded_For $proxy_add_x_forwarded_for;
}

Here is what I find

• Access to the resources, https://example.com/text.txt on the Nginx server is straightforward
• I startup the Nodejs server nodejs index.js & disown which has been configured to output a few diagnostic messages to a log file. Those messages tell me that the server is working just fine.
• I can Telnet to Port 8080 from inside the Docker container - once again indicating that the Node server i sup and running
• Precisely the same configuration but with Nginx running on a "real" server with Node running on the same server offers acceess to the Node server with no issues.
• However, when I attempt to access the Node server running inside the Nginx Docker container, say, https://example.com/node/index.js I get a 404 error.

Examining my Nginx logs reveals that the request did reach Nginx inside its Docker host. However, examining the Node server log file indicates that the request never got forwarded.

It is not clear to me why this could be happening. From what I can tell when Nginx is running inside a Docker container it is failing to act as a reverse proxy for Node running inside the same container.

For good measure I tried EXPOSing the Node port, 8080 and starting up the Docker container with -p 8080:8080 -p 443:443 but that made no difference. I'd be most grateful to anyone who might be able to shed any light on what is going on here.