I have the following configuration working. I am able to login to the application and most of it works. However there are
certain elements which function as websockets. I see this message in the browser devtools:

WebSocket connection to 'wss://erx.asdf.com/ws/stats' failed: edge.min.js:3210

How can I get this last part working?

Here is my configuration so far:

server {
listen 80;
server_name erx.asdf.com;
location / { return 301 https://$host$request_uri; }
}

upstream backend {
server 192.168.1.1:443;
}

server {
listen 443;
server_name erx.asdf.com;
location / {
proxy_pass https://backend;
proxy_ssl_server_name on;
proxy_ssl_name DOMAIN;
proxy_set_header Host $host;
}
}