example-websocket.conf

map $http_upgrade $connection_upgrade {
  default upgrade;
  '' close;
}

upstream websocket {
  server localhost:16981;
}

server {
  listen 80;
  server_name ws.server.com;

  location / {
      proxy_pass http://websocket;
      proxy_http_version 1.1;
      proxy_set_header Upgrade $http_upgrade;
      proxy_set_header Connection $connection_upgrade;
      proxy_set_header Host $host;	
      proxy_read_timeout 9999999s;
  }
}