Troubleshooting 502 Bad Gateway error on nginx reverse proxy configuration-CodePudding

I'm running into some issues with my nginx configuration and I'm hoping someone here might be able to help. I'm trying to set up a reverse proxy to redirect traffic from a subdomain to a different server, but I keep getting a 502 Bad Gateway error when I try to access the subdomain.

Here's my configuration file:

server {
    listen 80;
    server_name subdomain.example.com;

    location / {
        proxy_pass http://localhost:3000;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_cache_bypass $http_upgrade;
    }
}

I've checked and the server on localhost:3000 is running, so I'm not sure what the issue could be. Any ideas or suggestions would be greatly appreciated. Thanks in advance!

CodePudding user response：

If you just need to forward, there is no need for upgrade.

location / {
  proxy_pass http://localhost:3000/;
  proxy_set_header Host $host;
  proxy_set_header X-Real-IP $remote_addr;
  proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
}