The following two Go sites can be served locally, which can be very useful when you don’t have internet connections.

To serve golang.org locally

godoc -http=0.0.0.0:4000

godoc is installed with Go environment in $GOROOT/bin.

To serve “A tour of Go” locally

go get golang.org/x/tour/gotour
gotour -http=0.0.0.0:4000

gotour is installed in $GOPATH/bin.