go: os/exec: Pipe of command's stdout to network connection not working on windows

What did you do?

I’m trying to pipe the output of a program to a network connection. The code below works on Linux/android/osx:

package main

import (
	"log"
	"net"
	"os"
	"os/exec"
)

func main() {
	conn, err := net.Dial("tcp", "localhost:8089")
	if err != nil {
		log.Fatal(err)
	}

	defer func() {
		err := conn.Close()
		if err != nil {
			log.Fatal(err)
		}
	}()

	cmd := exec.Command("echo", "hello world")
	cmd.Stdout = conn
	cmd.Stderr = os.Stderr
	cmd.Stdin = os.Stdin

	err = cmd.Run()
	if err != nil {
		log.Fatal(err)
	}
}

What did you expect to see?

I expect the string “hello world” sent to tcp://localhost:8089, as works in linux,

What did you see instead?

Nothing is sent.

System details

go version go1.9.1 windows/amd64
GOARCH="amd64"
GOBIN=""
GOEXE=".exe"
GOHOSTARCH="amd64"
GOHOSTOS="windows"
GOOS="windows"
GOPATH="C:\Users\Tiago\go"
GORACE=""
GOROOT="C:\Go"
GOTOOLDIR="C:\Go\pkg\tool\windows_amd64"
GCCGO="gccgo"
CC="gcc"
GOGCCFLAGS="-m64 -mthreads -fmessage-length=0"
CXX="g++"
CGO_ENABLED="1"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOROOT/bin/go version: go version go1.9.1 windows/amd64
GOROOT/bin/go tool compile -V: compile version go1.9.1