Hello, I’m configuring nginx but using proxy_pass to the docker-compose front-end returns 502 bad gateway. How can I debug it?

# Root domain points to port 3301 
    location / { 
        proxy_pass <http://127.0.0.1:3301/>; 
        # proxy_set_header Host $host; 
        # proxy_set_header X-Real-IP $remote_addr; 
    }

I’m doing http -> redirects to https