Re:Show HN: A simple Go web server with logging, tracing, he...
by TheDong on Sunday January 07, 2018 @09:05PM
(#16094108)
golang.org/x/ packages are not builtin. You still must download them and use them just as you do any other dependencies, they just share some contribution process and developers with golang's stdlib.
[0]: https://godoc.org/golang.org/x/crypto/acme/autocert