Deployment

Typically - you should use nginx/lighttpd/apache on the frontend - and the tileserver-gl server is hidden behind it in production deployment.

Caching

There is a plenty of options you can use to create proper caching infrastructure: Varnish, CloudFlare, ...

Securing

Nginx can be used to add protection via https, password, referrer, IP address restriction, access keys, etc.

Running behind a proxy or a load-balancer

If you need to run TileServer GL behind a proxy, make sure the proxy sends X-Forwarded-* headers to the server (most importantly X-Forwarded-Host and X-Forwarded-Proto) to ensures the URLs generated inside TileJSON etc. are using the desired domain and protocol.