Microsoft.Http.HttpClient, sending HTTP authentication parameters properly on redirects

i am making a request to a 3rd party RESTful service using Microsoft's HttpClient. It works flawlessly (and is very easy to implement) except for this one instance. Here is a breakdown from the provider as to what is occurring during the error:

"The way the POST to the group resource works is that when it completes, it does a HTTP 302 redirect to the group instance resource. What appears to be happening is that your HTTP Client is sending the proper authentication information to the POST, which cre开发者_如何学Cates the group resource, but when it handles the GET for the HTTP 302 request, it is not sending the right credentials and is getting a 401 response. Can you check your client library and make sure its sending HTTP auth parameters properly on redirects?"

Here is my POST code:

HttpClient http = new HttpClient(BASE_URL);
http.TransportSettings.Credentials = new NetworkCredential(ACCOUNT_SID, 
                                       ACCOUNT_TOKEN);
HttpResponseMessage httpResponse = http.Post(groupUri, "application/xml", 
                                       HttpContent.Create(xml.ToString()));
result = httpResponse.Content.ReadAsString();

Which brings me to my question; how do I get the authentication parameters to send on this GET redirect using the HttpClient class?

I had a similar problem and at the end I added a form with a WebBrowser control. Whithout calling form.Show() I can tell him to navigate to an URL, click buttons and all. Here is the class that controls that form:

public class Nav
{
    FormNav formNav = new FormNav();
    public string Source
    {
        get
        {
            mshtml.HTMLDocument doc = (mshtml.HTMLDocument)formNav.webBrowser.Document.DomDocument;
            return doc.documentElement.innerHTML;
        }
    }

    public void GoTo(string Url)
    {
        formNav.webBrowser.Navigate(Url);
        Wait();
    }

    public void Fill(string Field, string Value)
    {
        formNav.webBrowser.Document.GetElementById(Field).InnerText = Value;
    }

    public void Click(string Element)
    {
        formNav.webBrowser.Document.GetElementById(Element).InvokeMember("click");
        Wait();
        Application.DoEvents();
    }

    public void Wait()
    {
        const int TIMEOUT = 30;

        formNav.Ready = false;
        DateTime start = DateTime.Now;
        TimeSpan span;

        do
        {
            Application.DoEvents();
            span = DateTime.Now.Subtract(start);
        } while (!formNav.Ready && span.Seconds < TIMEOUT);
    }

    public void Dispose()
    {
        formNav.Dispose();
    }
}

And here is the code for the form (some extra code is needed to disable the clicking sound).

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;

public partial class FormNav : Form
{
    private const int FEATURE_DISABLE_NAVIGATION_SOUNDS = 21;
    private const int SET_FEATURE_ON_THREAD = 0x00000001;
    private const int SET_FEATURE_ON_PROCESS = 0x00000002;
    private const int SET_FEATURE_IN_REGISTRY = 0x00000004;
    private const int SET_FEATURE_ON_THREAD_LOCALMACHINE = 0x00000008;
    private const int SET_FEATURE_ON_THREAD_INTRANET = 0x00000010;
    private const int SET_FEATURE_ON_THREAD_TRUSTED = 0x00000020;
    private const int SET_FEATURE_ON_THREAD_INTERNET = 0x00000040;
    private const int SET_FEATURE_ON_THREAD_RESTRICTED = 0x00000080;

    [DllImport("urlmon.dll")]
    [PreserveSig]
    [return: MarshalAs(UnmanagedType.Error)]
    static extern int CoInternetSetFeatureEnabled(
        int FeactureEntry,
        [MarshalAs(UnmanagedType.U4)] int dwFlags,
        bool fEnable);

    public bool Ready;

    public FormNav()
    {
        InitializeComponent();
        Ready = true;

        int feature = FEATURE_DISABLE_NAVIGATION_SOUNDS;
        CoInternetSetFeatureEnabled(feature, SET_FEATURE_ON_PROCESS, true);
    }

    private void webBrowser_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
    {
        Ready = true;
    }
}

And the Microsoft Html Object COM Library should be added if the source code is needed.