EDIT: fixed the NGINX issue, just needed to add some headers:
1 server {
2 listen 80;
3 server_name cryosparc.{hostname};
4
5 location / {
6 proxy_pass http://localhost:39000;
7 }
8
9 location /websocket {
10 proxy_pass http://localhost:39000;
11 proxy_http_version 1.1;
12 proxy_set_header Upgrade $http_upgrade;
13 proxy_set_header Connection "Upgrade";
14 proxy_set_header Host $host;
15 }
16 }