[giancarlostoro]

Go supports FastCGI out of the box (and regular CGI) and might not be a bad place to look, unless I'm misunderstanding what you're asking:

https://golang.org/pkg/net/http/fcgi/

Underlying code:

https://golang.org/src/net/http/fcgi/

Edit:

They also link to a 'unofficial' spec they referenced it seems https://fast-cgi.github.io/

[francislavoie]

And to pair with this, Caddy has a fastcgi transport for the proxy module https://caddyserver.com/docs/caddyfile/directives/reverse_pr...

Or if you're running PHP, this shortcut usually does the right thing: https://caddyserver.com/docs/caddyfile/directives/php_fastcg...

[monkeycantype]

I can't tell you how to implement one from scratch if that's your question, but I use apache httpd with mod_fcgi.

This server isn't directly exposed, only valid requests are proxied to it.

I have no reason to think this is the best approach, it's a near forgotten foundational layer of an application that has been stable and reliable for a decade, that is under constant attack and regularly pen-tested.