WinRM's equivalent of Hello World in Go, from the XML sample in on the front page of MSDN's WS-Management documentation.

WinRM in Go

package main

import (
	"bytes"
	"encoding/base64"
	"fmt"
	"io/ioutil"
	"log"
	"net/http"
)

var user = "vagrant"
var pass = "vagrant"

func main() {
	command := `<s:Envelope
  xmlns:s="http://www.w3.org/2003/05/soap-envelope"
  xmlns:a="http://schemas.xmlsoap.org/ws/2004/08/addressing"
  xmlns:w="http://schemas.dmtf.org/wbem/wsman/1/wsman.xsd"
>
  <s:Header>
    <a:To>http://RemoteComputer:80/wsman</a:To>
    <w:ResourceURI s:mustUnderstand="true">
      http://schemas.microsoft.com/wbem/wsman/1/wmi/root/cimv2/Win32_logicaldisk
    </w:ResourceURI>
    <a:ReplyTo>
    <a:Address s:mustUnderstand="true">
      http://schemas.xmlsoap.org/ws/2004/08/addressing/role/anonymous
    </a:Address>
    </a:ReplyTo>
    <a:Action s:mustUnderstand="true">
      http://schemas.xmlsoap.org/ws/2004/09/transfer/Get
    </a:Action>
    <w:MaxEnvelopeSize s:mustUnderstand="true">153600</w:MaxEnvelopeSize>
    <a:MessageID>uuid:4ED2993C-4339-4E99-81FC-C2FD3812781A</a:MessageID>
    <w:Locale xml:lang="en-US" s:mustUnderstand="false"/>
    <w:SelectorSet>
      <w:Selector Name="DeviceId">c:</w:Selector>
    </w:SelectorSet>
    <w:OperationTimeout>PT60.000S</w:OperationTimeout>
  </s:Header>
  <s:Body />
</s:Envelope>`

	request, _ := http.NewRequest("POST",
		"http://localhost:5985/wsman", bytes.NewBufferString(command))
	request.Header.Add("Content-Type", "application/soap+xml;charset=UTF-8")
	request.Header.Add("Authorization", "Basic "+
		base64.StdEncoding.EncodeToString([]byte(user+":"+pass)))

	client := &http.Client{}
	response, err := client.Do(request)

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

	fmt.Println("HTTP Status", response.Status)

	for key, value := range response.Header {
		fmt.Println("  ", key, ":", value)
	}

	defer response.Body.Close()
	body, _ := ioutil.ReadAll(response.Body)
	fmt.Printf("%s", body)
}

Should print something like...

Status 200
   Content-Type : [application/soap+xml;charset=UTF-8]
   Server : [Microsoft-HTTPAPI/2.0]
   Date : [Sun, 17 Nov 2013 16:46:51 GMT]
   Content-Length : [2411]
<s:Envelope>....</s:Envelope>