Set up a lichess proxy to bypass firewalls and play chess at school/work

lichess.proxy.conf

# /etc/nginx/sites-enabled/lichess.proxy.conf
# Replace "lichess.scalex.org" by your own domain.
# Note: This only works for the "en" subdomain.

server {
  listen 80;
  server_name socket.en.lichess.scalex.org;
  location / {
    proxy_set_header Host socket.en.lichess.org;
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "upgrade";
    proxy_pass http://socket.en.lichess.org/;
  }
}
server {
  listen 80;
  server_name en.lichess.scalex.org;
  proxy_cookie_domain .lichess.org .lichess.scalex.org;
  location / {
    proxy_set_header Host en.lichess.org;
    proxy_pass http://en.lichess.org/;
  }
}

Example: http://en.lichess.scalex.org/

How to use ??!!