Don't use a TFPHTTPServer as you main interface anyway. If you put your service on the internet, there will be thousands of bots every day trying to find common vulnerabilities to infect systems, e.g. to deploy malware, FCL-Web is not a security product, it is not hardened, there is no security evaluation of it, etc.
Also it has very limited features e.g. no load balancing and is not really optimized.
Bonus points: You don't need to handle TLS and other annoying things like file caching and resource serving in your server.
Instead you should use one of the major webservers like Apache or NGINX. You can either deploy your pascal webserver as a local server and use Apache or NGINX as a reverse proxy, this can easily be combined with docker for easy deployment, or you use CGI or FastCGI instead.
I'd recommend to use CGI, it's supported by fcl web and you can use the same web modules for HTTP Server and CGI, so you can test locally with a standalone server and deploy as CGI. It's also very simple to deploy as it's just a single binary. Also because every request gets it's own process it is easier to protect against side channel attacks e.g. caused by buffer overflows in the same address space
