code-server 4.0.0 behind nginx reports wrong port

Using the following nginx configuration (fragment) in combination the SSL and code server reports port 80 in code-server instead of 443/https?

```
    location / {
      proxy_pass http://localhost:8080/;
      proxy_set_header Host $host;
      proxy_set_header Upgrade $http_upgrade;
      proxy_set_header Connection upgrade;
      proxy_set_header Accept-Encoding gzip;
    }
```