nginx to reverse proxy websockets

nginx.conf

upstream my_websocket {  
    server localhost:443;  
}  
 
server {  
    listen 444;  
    server_name _;  
   
    location / {  
        proxy_pass http://my_websocket ;  
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";  
        proxy_set_header Host $host;  
        proxy_read_timeout 86400;  // default 60 secs
    }  
}