It is generally repeated that the Go stdlib webserver is internet-facing-ok and production-ready (with appropriate timeouts being set on the http.Server), making a reverse proxy unnecessary.
There are also dead-simple TLS libraries, some that will even get LE certs automatically.
Agreed, I have recently built a web server entirely (with timeouts) in Go too and acme.sh for LE certs but I still haven't find a way to support Wordpress from Go to PHP-FPM, I'm not well verse to fix the only this part, if you have any suggestion is greatly appreciate.
There are also dead-simple TLS libraries, some that will even get LE certs automatically.