How can I use system credentials for NTLM authentication in Go HTTP requests?

NTLM Authentication in Go HTTP Requests Using System Credentials

Authenticating with NTLM in a Go HTTP request can be simplified by utilizing the user's system credentials. In other languages like C# and Python, this is achievable using built-in libraries.

To perform NTLM authentication with system credentials in Go, you can leverage the go-ole package. This package allows interaction with COM (Component Object Model) objects, including the WinHTTPRequest object.

Here's a code snippet that demonstrates how to achieve this:

<code class="go">package main

import (
    "fmt"

    ole "github.com/go-ole/go-ole"
    "github.com/go-ole/go-ole/oleutil"
)

func main() {
    ole.CoInitialize(0)
    defer ole.CoUninitialize()
    unknown, _ := oleutil.CreateObject("WinHTTP.WinHTTPRequest.5.1")
    request, _ := unknown.QueryInterface(ole.IID_IDispatch)
    oleutil.CallMethod(request, "SetAutoLogonPolicy", 0)
    oleutil.CallMethod(request, "Open", "GET", "http://example.com", false)
    oleutil.CallMethod(request, "Send")
    resp := oleutil.MustGetProperty(request, "ResponseText")
    fmt.Println(resp.ToString())
}</code>

By leveraging the WinHTTPRequest object and setting the AutoLogonPolicy to 0, the system credentials are automatically applied to the HTTP request. This approach simplifies NTLM authentication in Go, allowing you to make requests without explicitly providing username and password credentials.

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